Evaluating Node Status – I/O LED (Blink Code Table). WAGO MODBUS Fieldbus Coupler RTU
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82 Diagnostics WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
9.1.2 Evaluating Node Status – I/O LED (Blink Code Table)
The communication status between fieldbus coupler/controller and the I/O modules is indicated by the I/O LED.
Table 34: Node Status Diagnostics – Solution in Event of Error
LED Status Meaning Solution
I/O green The fieldbus node is operating correctly. Normal operation. orange flashing red red flashing red cyclical flashing
Start of the firmware.
1 … 2 seconds of rapid flashing indicate start-up.
Coupler/controller hardware defect
Flashing with approx.. 10 Hz indicates the initialization of the internal bus or of a internal bus error.
-
Replace the fieldbus coupler/controller.
Note the following flashing sequence.
Up to three successive flashing sequences indicate internal data bus errors. There are short intervals between the sequences.
Evaluate the flashing sequences based on the following blink code table.
The blinking indicates an error message comprised of an error code and error argument. off
No data cycle on the internal bus. The fieldbus coupler/controller supply is off.
Device boot-up occurs after turning on the power supply. The I/O LED flashes orange.
Then the bus is initialized. This is indicated by flashing red at 10 Hz for
1 … 2 seconds.
After a trouble-free initialization, the I/O LED is green.
In the event of an error, the I/O LED continues to blink red. Blink codes indicate detailed error messages. An error is indicated cyclically by up to 3 flashing sequences.
After elimination of the error, restart the node by turning the power supply of the device off and on again.
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Diagnostics 83
Figure 42: Node Status – I/O LED Signaling
Figure 43: Error Message Coding
Example of a module error:
• The I/O LED starts the error display with the first flashing sequence
(approx. 10 Hz).
• After the first break, the second flashing sequence starts (approx. 1 Hz):
The I/O LED blinks four times.
Error code 4 indicates “data error internal data bus”.
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750-316/300-000 Fieldbus Coupler MODBUS RTU
• After the second break, the third flashing sequence starts (approx. 1 Hz):
The I/O LED blinks twelve times.
Error argument 12 means that the internal data bus is interrupted behind the twelfth I/O module.
The thirteenth I/O module is either defective or has been pulled out of the assembly.
Table 35: Blink Code- Table for the I/O LED Signaling, Error Code 1
Error code 1: “Hardware and configuration error”
Error
Argument
Error Description Solution
-
Invalid check sum in the parameter area of the fieldbus controller.
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
1
Overflow of the internal buffer memory for the attached I/O modules.
1. Turn off the power for the node.
2. Reduce the number of I/O modules.
3. Turn the power supply on again.
4. If the error persists, replace the fieldbus controller.
2
I/O module(s) with unknown data type
1. Determine the faulty I/O module by first turning off the power supply.
2. Plug the end module into the middle of the node.
3. Turn the power supply on again.
4. - LED continues to flash? -
Turn off the power supply and plug the end module into the middle of the first half of the node (toward the fieldbus controller).
- LED not flashing? -
Turn off the power and plug the end module into the middle of the second half of the node (away from the fieldbus controller).
5. Turn the power supply on again.
6. Repeat the procedure described in step 4 while halving the step size until the faulty I/O module is detected.
7. Replace the faulty I/O module.
8. Inquire about a firmware update for the fieldbus controller.
3
Unknown module type of the
Flash program memory
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
4
Fault when writing in the Flash program memory.
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
5
Fault when deleting the Flash memory.
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
Manual
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WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Diagnostics 85
Table 35: Blink Code- Table for the I/O LED Signaling, Error Code 1
Error code 1: “Hardware and configuration error”
Error
Argument
Error Description Solution
6
The I/O module configuration after
AUTORESET differs from the configuration determined the last time the fieldbus controller was powered up.
1. Restart the fieldbus controller by turning the power supply off and on.
7
Fault when writing in the serial EEPROM.
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
8
Invalid hardwarefirmware combination.
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
9
Invalid check sum in the serial EEPROM.
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
10
Serial EEPROM initialization error
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
11
Fault when reading in the serial
EEPROM.
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
12
Timeout during access on the serial
EEPROM
1. Turn off the power supply for the node.
2. Replace the fieldbus controller.
3. Turn the power supply on again.
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14
Maximum number of gateway or mailbox modules exceeded
1. Turn off the power for the node.
2. Reduce the number of corresponding modules to a valid number.
3. Turn the power supply on again.
Table 36: Blink Code Table for the I/O LED Signaling, Error Code 2
Error code 2: -not used-
Error
Argument
Error Description Solution
- Not used -
86 Diagnostics WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 37: Blink Code Table for the I/O LED Signaling, Error Code 3
Error code 3: “Protocol error, internal bus”
Error
Argument
Error Description Solution
-
Internal data bus communication is faulty, defective module cannot be identified.
- Are passive power supply modules (750-613) located in the node? -
1. Check that these modules are supplied correctly with power.
2. Determine this by the state of the associated status LEDs.
- Are all modules connected correctly or are there any
750-613 Modules in the node? -
1. Determine the faulty I/O module by turning off the power supply.
2. Plug the end module into the middle of the node.
3. Turn the power supply on again.
4. - LED continues to flash? -
Turn off the power supply and plug the end module into the middle of the first half of the node (toward the fieldbus coupler).
- LED not flashing? -
Turn off the power and plug the end module into the middle of the second half of the node (away from the fieldbus coupler).
5. Turn the power supply on again.
6. Repeat the procedure described in step 4 while halving the step size until the faulty I/O module is detected.
7. Replace the faulty I/O module.
8. If there is only one I/O module on the fieldbus coupler and the LED is flashing, either the I/O module or fieldbus coupler is defective. Replace the I/O module with a pretested, properly functioning I/O module. If the LED no longer flashes, the replaced I/O module was faulty.
Replace this I/O module.
9. If the LED continues to flash, the fieldbus coupler is faulty. Replace the fieldbus coupler.
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Diagnostics 87
Table 38: Blink Code Table for the I/O LED Signaling, Error Code 4
Error code 4: “Physical error, internal bus”
Error
Argument
Error Description Solution
-
Internal bus data transmission error or interruption of the internal data bus at the fieldbus coupler
1. Turn off the power supply to the node.
2. Plug the end module behind the fieldbus coupler.
3. Turn the power supply on.
4. Observe the error argument signaled.
- Is no error argument indicated by the I/O LED? -
5. Replace the fieldbus coupler.
- Is an error argument indicated by the I/O LED? -
5. Identify the faulty I/O module by turning off the power supply.
6. Plug the end module into the middle of the node.
7. Turn the power supply on again.
8. - LED continues to flash? -
Turn off the power and plug the end module into the middle of the first half of the node (toward the fieldbus coupler).
- LED not flashing? -
Turn off the power and plug the end module into the middle of the second half of the node (away from the fieldbus coupler).
9. Turn the power supply on again.
10. Repeat the procedure described in step 6 while halving the step size until the faulty I/O module is detected.
11. Replace the faulty I/O module.
12. If there is only one I/O module on the fieldbus coupler and the LED is flashing, either the I/O module or fieldbus coupler is defective. Replace the I/O module with a pretested, properly functioning I/O module. If the LED no longer flashes, the replaced I/O module was faulty.
Replace this I/O module.
13. If the LED continues to flash, the fieldbus coupler is faulty. Replace the fieldbus coupler. n*
Interruption of the internal data bus behind the nth I/O module with process data
1. Turn off the power supply to the node.
2. Replace the (n+1) I/O module containing process data.
3. Turn the power supply on.
* The number of light pulses (n) indicates the position of the I/O module.
I/O modules without data are not counted (e.g., supply modules without diagnostics)
Table 39: Blink Code Table for the I/O LED Signaling, Error Code 5
Error code 5: “Initialization error, internal bus”
Error
Argument
Error Description Solution n*
Error in register communication during internal bus initialization
1. Turn off the power supply to the node.
2. Replace the (n+1) I/O module containing process data.
3. Turn the power supply on.
* The number of light pulses (n) indicates the position of the I/O module.
I/O modules without data are not counted (e.g., supply modules without diagnostics)
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88 Diagnostics WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 40: Blink Code Table for the 'I/O' LED Signaling, Error Code 7…8
Error code 7…8: -not used-
Error
Argument
Error Description Solution
- Not used
Table 41: Blink Code Table for the I/O LED Signaling, Error Code 9
Error code 9: “CPU Trap error”
Error
Argument
Error Description Solution
1 Illegal Opcode
2
3
Stack overflow
Stack underflow
Fault in the program sequence.
1. Please contact the I/O Support.
4 NMI
9.1.3 Evaluating Power Supply Status
The power supply unit of the device has two green LEDs that indicate the status of the power supplies.
LED “A” indicates the 24 V supply of the coupler.
LED “B” or “C” reports the power available on the power jumper contacts for field side power.
Table 42: Power Supply Status Diagnostics – Solution in Event of Error
LED Status Meaning Solution
A
Green
Operating voltage for the system is available.
-
Off No power is available for the system
Check the power supply for the system
(24 V and 0 V).
B or C
Green
Off
The operating voltage for power jumper contacts is available.
No operating voltage is available for the power jumper contacts.
-
Check the power supply for the power jumper contacts (24 V and 0 V).
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Diagnostics 89
9.2 Behavior of the Fieldbus Coupler during
Interruption of Operations
An interruption of operation occurs when the fieldbus coupler can no longer exchange process data with the master and/or the I/O modules.
9.2.1 Loss of Power
In the case loss of power outage or falling below the minimum level of the power supply to the fieldbus coupler, the communication with the master and the I/O modules will be interrupted. The I/O modules connected to the fieldbus coupler will switch their output data to a value of “0”.
9.2.2 Loss of Fieldbus
The fieldbus coupler determines that a loss of the fieldbus has occurred when the communication to the master is interrupted. A loss of fieldbus can be caused by losing the master itself or by an interruption in the communication connection.
A loss of fieldbus additionally means that the fieldbus coupler cannot receive any output process data from the master nor can it send any input process data to the master.
During a loss of fieldbus, the fieldbus coupler switches the output signal of the
I/O modules to a value of “0”.
9.2.3 Internal Data Bus Error
The fieldbus coupler determines that an internal data bus error has occurred when the communication with the I/O modules is disrupted or interrupted. An internal data bus error can occur due to the removal e.g. of an I/O module from the fieldbus node.
In addition, an internal data bus error means that the fieldbus coupler cannot exchange any more process data with the I/O modules.
The I/O modules switch their output signals to a value of “0” in the case of an error.
The fieldbus coupler reports an internal data bus error by sending a blink code. To send the blink code, the fieldbus coupler uses the I/O LED.
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90 Fieldbus Communication WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
10 Fieldbus Communication
10.1 MODBUS-Functions
10.1.1 General
MODBUS is a non-vendor-specific, open fieldbus standard for a wide range of applications in production and process automation.
The MODBUS protocol is implemented in accordance with the "MODBUS
APPLICATION PROTOCOL SPECIFICATION V1.1b3" and provides the following functions:
• Provision of the process image
• Provision of the fieldbus variables
• Provision of various settings for the fieldbus coupler/controller via the fieldbus
Additional Information
The structure of a datagram is specific for the individual function. Refer to the descriptions of the MODBUS Function codes.
Information Additional information
More information is available on the Internet at: http://www.modbus.org
The MODBUS protocol is essentially based on the following basic data types:
Table 43: Basic Data Types for the MODBUS Protocol
Data Type
Discrete Inputs
Length
1 bits
Description
Digital inputs:
Coils
Input Register
1 bits
16 bits
Digital outputs:
Analog inputs:
Holding Register 16 bits Analog outputs:
One or more function codes are defined for every basic data type.
Using these functions, the necessary binary input/output data or analog input/output data and internal variables from the fieldbus node can be set or read out directly.
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Fieldbus Communication 91
Reading of outputs with FC1 to FC4 and FC23 is possible by adding an offset!
In divergence from the MODBUS standard, all functions access input and output data in an identical manner for read access. An offset of 200hex (0x0200) must be added to the MODBUS address for read access to output data. For write access to output data either the MODBUS base addresses starting from 0x0000 or the
MODBUS address with an offset of 200hex (0x0200…) may be used equivalently.
Table 44: List of MODBUS Functions Implemented in the Fieldbus Coupler
Function code Function name Type of access and description Access to resources
FC1 0x01
FC2 0x02
Read Coils
Read Discrete
Inputs
Reading of multiple input bits, reading back of multiple output bits
R: Process image
FC3 0x03
FC4 0x04
Read Holding
Registers
Read Input
Registers
Reading of multiple input registers, reading back of multiple output registers
R: Process image, internal variables
FC5 0x05
FC6 0x06
FC11 0x0B
Write Single Coil Writing of a single output bit
Write Single
Register
Get Comm Event
Counters
Writing of a single output register
Communication event counter
W:
W:
Process image
Process image, internal variables
R: None
FC15 0x0F
FC16
FC23
0x10
0x17
Write Multiple
Coils
Write Multiple
Registers
Read/Write
Multiple
Registers
Writing of multiple output bits W: Process image
Writing of multiple output registers
Reading of multiple input registers, reading and writing of multiple output registers
W:
R/W:
Process image, internal variables
Process image, internal variables
To execute a desired function, specify the respective function code and the address of the selected input or output data.
Note the number system when addressing!
The examples listed use the hexadecimal system (i.e.: 0x000) as their numerical format. Addressing begins with 0. The format and beginning of the addressing may vary according to the software and the control system. All addresses then need to be converted accordingly.
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10.1.2 Using the MODBUS Functions
The graphic overview illustrates the access of a few MODBUS functions to process image data using an example of a fieldbus node.
Note
Figure 44: Using MODBUS Functions for a Fieldbus Coupler/Controller
Use of bit functions should be given priority for binary signals!
It is meaningful to access binary signals using bit functions . If reading or writing access to binary signals is performed via register functions , an address shift may occur when other analog input/output modules are operated at the fieldbus coupler/controller.
Note!
Only the 512 binary input and output signals with the lowest values may be addressed using bit functions . Only register functions may be used to access digital inputs/outputs beyond this.
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10.1.3 Description of the MODBUS Functions
Fieldbus Communication 93
All MODBUS functions are executed as follows:
1. A MODBUS TCP master (e.g., a PC) makes a request to the WAGO fieldbus node using a specific function code based on the desired operation..
2. The WAGO fieldbus node receives the datagram and then responds to the master with the proper data, which is based on the master’s request.
If the WAGO fieldbus node receives an incorrect request, it sends an error datagram (Exception) to the master.
The exception code contained in the exception has the following meaning:
Table 45: Exception Codes
Exception code Meaning
0x01 Illegal function
0x02
0x03
0x04
Illegal data address
Illegal data value
Slave device failure
0x05
0x06
0x08
0x0A
0x0B
Acknowledge
Server busy
Memory parity error
Gateway path unavailable
Gateway target device failed to respond
The telegram structure for Request, Response and Exception is explained for each function code using examples in the sections that follow.
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10.1.3.1 Function Code FC1 (Read Coils) and FC2 (Read Discrete Inputs)
These functions read out multiple input bits (e.g., digital inputs) and/or output bits
(e.g., digital outputs) and are to be used identically.
Based on the tables for MODBUS register mapping, these bit functions can be used to address only the 512 lowest value input or output bits for the process image. As the maximum number of I/O modules (64) enables a node to be set up with up to 1024 digital signals, it may be necessary to also address digital inputs/
-outputs beyond this. Register functions FC3 and FC4 must be used for this.
Structure of the request
The request determines the start address and the number of bits to be read.
Example: A request of which bit 0 to bit 7 is to be read.
Table 46: Request Structure for Function Codes FC1 and FC2
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8, 9
Byte 10, 11
Field name
Transaction identifier
Protocol identifier
Length field
Unit identifier
Example
0x0000
0x0000
0x0006
0x01 not used
MODBUS function code 0x01 or 0x02
Starting address 0x0000
Bit count 0x0008
Structure of the response
The current values of the queried bits are entered into the data field. Value 1 =
ON, value 0 = OFF. The least significant bit of the first data byte contains the first bit of the request. The other bits follow in ascending order. If the number of inputs is not a multiple of 8, the remaining bits of the last data byte are filled with zeros.
Table 47: Response Structure for Function Codes FC1 and FC2
Byte
...
Byte 7
Field name
MODBUS function code
Example
0x01 or 0x02
Byte 8
Byte 9
Byte count
Bit values
0x01
0x12
The status of inputs 7 to 0 is indicated as byte value 0x12 or binary 0001 0010.
Input 7 is the bit with the highest value, input 0 with the lowest value for this byte.
Assignment is made from 7 to 0 as follows:
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Fieldbus Communication 95
Table 48: Input Assignments
OFF OFF OFF ON OFF OFF ON OFF
Bit 0 0 0 1 0 0 1 0
Coil 7 6 5 4 3 2 1 0
Structure of the exception
Table 49: Exception Structure for Function Codes FC1 and FC2
Byte
...
Byte 7
Field name
Byte 8
Example
MODBUS function code 0x81 (for FC1) or 0x82
(for FC2)
Exception code 0x02
10.1.3.2 Function Code FC3 (Read Holding Registers) and FC4 (Read Input
Registers)
These functions read out multiple input words (input registers) and/or output words (output registers) and are to be used indentically.
Structure of the request
The request determines the address of the start word (start register) and the number of registers to be read.
Example: request to read registers 0 and 1.
Table 50: Request Structure for Function Codes FC3 and FC4
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8, 9
Byte 10, 11
Field name
Transaction identifier
Protocol identifier
Length field
Unit identifier
Example
0x0000
0x0000
0x0006
0x01 not used
MODBUS function code 0x03 or 0x04
Starting address 0x0000
Word count 0x0002
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Structure of the response
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
The register data of the response is entered into the registers (2 bytes per register).
The first byte contains the more significant bits, the second byte contains the less significant bits.
Table 51: Response Structure for Function Codes FC3 and FC4
Byte
...
Byte 7
Byte 8
Byte 9, 10
Byte 11, 12
Field name
MODBUS function code
Byte count
Value register 0
Value register 1
Example
0x03 or 0x04
0x04
0x1234
0x2345
The response shows that register 0 contains the value 0x1234 and register 1 contains the value 0x2345.
Structure of the exception
Table 52: Exception Structure for Function Codes FC3 and FC4
Byte
...
Byte 7
Byte 8
Field name
Exception code
Example
MODBUS function code 0x83 (for FC3) or 0x84
0x02
10.1.3.3 Function Code FC5 (Write Single Coil)
This function writes a digital output bit. Value 0xFF00 sets the output to TRUE, value 0x0000 to FALSE.
Structure of the request
The request determines the address of the output bit.
Example: Setting the second output bit (address 1).
Table 53: Request Structure for Function Code FC5
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Field name
Transaction identifier
Protocol identifier
Length field
Example
0x0000
0x0000
0x0006
Unit identifier 0x01 not used
MODBUS function code 0x05
Byte 8, 9
Byte 10
Byte 11
Output address
ON/OFF
0x0001
0xFF
0x00
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Structure of the response
Fieldbus Communication 97
Table 54: Response Structure for Function Code FC5
Byte
...
Byte 7
Field name Example
MODBUS function code 0x05
Byte 8, 9
Byte 10
Byte 11
Output address
Value
0x0001
0xFF
0x00
Structure of the exception
Table 55: Exception Structure for Function Code FC5
Byte
...
Byte 7
Byte 8
Field name Example
MODBUS function code 0x85
Exception code 0x02 or 0x03
10.1.3.4 Function Code FC6 (Write Single Register)
This function writes a value into a single output register.
Structure of the request
The request determines the address of the first output word to be set. The value to be set is determined in the request data field.
Example: Setting of the second output channel to 0x1234.
Table 56: Request Structure for Function Code FC6
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8, 9
Byte 10, 11
Field name
Transaction identifier
Protocol identifier
Example
0x0000
0x0000
Length field
Unit identifier
0x0006
0x01 not used
MODBUS function code 0x06
Register address 0x0001
Register value 0x1234
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Structure of the response
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
The response is an echo of the request.
Table 57: Response Structure for Function Code FC6
Byte
...
Byte 7
Field name
MODBUS function code
Example
0x06
Byte 8, 9
Byte 10, 11
Register address
Register value
0x0001
0x1234
Structure of the exception
Table 58: Exception Structure for Function Code FC6
Byte
...
Byte 7
Byte 8
Field name Example
MODBUS function code 0x86
Exception code 0x02
10.1.3.5 Function Code FC11 (Get Comm Event Counter)
This function returns a status word and a single event counter from the communication register of the fieldbus coupler/controller. The higher level control system can use this counter to determine whether the fieldbus coupler/controller has processed the messages properly.
Every time a message is processed successfully, the counter counts up.
Error messages or counter queries are not counted.
Structure of the request
Table 59: Request Structure for Function Code FC11
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Field name
Transaction identifier
Protocol identifier
Example
0x0000
0x0000
Length field
Unit identifier
0x0002
0x01 not used
MODBUS function code 0x0B
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Structure of the response
Fieldbus Communication 99
The response contains a 2-byte status word and a 2-byte event counter.
The status word consists of zeros.
Table 60: Response Structure for Function Code FC11
Byte
...
Byte 7
Byte 8, 9
Byte 10, 11
Field name Example
MODBUS function code 0x0B
Status 0x0000
Event count 0x0003
The event counter shows that 3 (0x0003) events were counted.
Structure of the exception
Table 61: Exception Structure for Function Code FC11
Byte
...
Byte 7
Byte 8
Field name Example
MODBUS function code 0x8B
Exception code 0x02
10.1.3.6 Function Code FC15 (Write Multiple Coils)
This function is used to set multiple output bits to 1 or 0.
Structure of the request
The request determines the start address and the number of bits to be set. The required state (1 or 0) of the bit is determined by the content of the request data field.
In this example, 16 bits are set, starting with address 0. The request contains 2 bytes with the value 0xA5F0, i.e. 1010 0101 1111 0000 binary.
The first byte assigns the 0xA5 value to address 7 to 0, with 0 being the least significant bit. The next byte assigns 0xF0 to address 15 to 8, with 8 being the least significant bit.
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 62: Request Structure for Function Code FC15
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Field name
Transaction identifier
Protocol identifier
Length field
Example
0x0000
0x0000
0x0009
Unit identifier 0x01 not used
MODBUS function code 0x0F
Byte 8, 9
Byte 10, 11
Byte 12
Byte 13
Byte 14
Starting address
Bit count
Byte count
Data byte1
Data byte2
0x0000
0x0010
0x02
0xA5
0xF0
Structure of the response
Table 63: Response Structure for Function Code FC15
Byte
...
Byte 7
Field name Example
MODBUS function code 0x0F
Byte 8, 9
Byte 10, 11
Starting address
Bit count
0x0000
0x0010
Structure of the exception
Table 64: Exception Structure for Function code FC15
Byte
...
Byte 7
Byte 8
Field name
Exception code
Example
MODBUS function code 0x8F
0x02
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Fieldbus Communication 101
10.1.3.7 Function Code FC16 (Write Multiple Registers)
This function writes values to a number of output registers.
Structure of the request
The request determines the start address and the number of registers to be set.
Two bytes of data per register are transmitted.
Example: The data in the registers 0 and 1 is set.
Table 65: Request Structure for Function Code FC16
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8, 9
Field name
Transaction identifier
Protocol identifier
Length field
Example
0x0000
0x0000
0x000B
Unit identifier 0x01 not used
MODBUS function code 0x10
Starting address 0x0000
Byte 10, 11
Byte 12
Byte 13, 14
Byte 15, 16
Word count
Byte count
Register value 1
Register value 2
0x0002
0x04
0x1234
0x2345
Structure of the response
Table 66: Response Structure for Function Code FC16
Byte
...
Byte 7
Byte 8, 9
Byte 10, 11
Field name
MODBUS function code
Starting address
Word count
Example
0x10
0x0000
0x0002
Structure of the exception
Table 67: Exception Structure for Function Code FC16
Byte
...
Byte 7
Byte 8
Field name
Exception code
Example
MODBUS function code 0x90
0x02
Manual
Version 1.0.0
102 Fieldbus Communication WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
10.1.3.8 Function Code FC23 (Read/Write Multiple Registers)
This function writes values to multiple output registers and reads values from multiple input and/or output registers. Write access is executed before read access.
Structure of the request
The request message determines the start address and the number of registers to be set. Two bytes of data per register are transmitted.
Example: The data in the register 3 is set to 0x0123.
Example: The values 0x0004 and 0x5678 are read from registers 0 and 1.
Table 68: Request Structure for Function Code FC23
Byte
Byte 0, 1
Byte 2, 3
Byte 4, 5
Byte 6
Byte 7
Byte 8, 9
Byte 10, 11
Byte 12, 13
Byte 14, 15
Field name
Transaction identifier
Protocol identifier
Length field
Unit identifier
MODBUS function code
Starting address for read
Word count for read
Starting address for write
Word count for write
Example
0x0000
0x0000
0x000F
0x01 not used
0x17
0x0000
0x0002
0x0003
0x0001
Byte 16 Byte count (2 x word count for write) 0x02
Byte 17...(B+16) Register values (B = Byte count) 0x0123
Structure of the response
Table 69: Response Structure for Function Code FC23
Byte
...
Field name
Byte 7
Byte 8
MODBUS function code
Byte count (2 x word count for read)
Byte 9...(B+1) Register values (B = Byte count)
Structure of the exception
Table 70: Exception Structure for Function Code FC23
Byte
...
Field name
Byte 7
Byte 8
MODBUS function code
Exception code
Example
0x17
0x04
0x0004 or 0x5678
Example
0x97
0x02
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Fieldbus Communication 103
10.1.4 MODBUS Register Mapping
The following tables display the MODBUS addressing and the internal variables.
10.1.4.1 Register Access
Register services are used to determine or change the statuses of complex and digital intput/output modules.
Read register access (with FC3, FC4 and FC23)
Table 71: Read register Access (with FC3, FC4 and FC23)
MODBUS Address
[dec] [hex]
IEC-61131-
Address
Memory area
0...255 0x0000...0x00FF %IW0...%IW255 Physical Input Area
256...511 0x0100...0x01FF - MODBUS Exception: "Illegal data address"
512...767 0x0200...0x02FF %QW0...%QW255 Physical Output Area
768...4095 0x0300...0x0FFF - MODBUS Exception: "Illegal data address"
4096...12287 0x1000...0x2FFF -
12288...65535 0x3000...0xFFFF -
Configuration register (see Section
"Configuration Register")
MODBUS Exception: "Illegal data address"
Write register access (with FC6, FC16 and FC23)
Table 72: Write Register Access (with FC6, FC16 and FC23)
MODBUS Address
[dec] [hex]
IEC-61131-
Address
Memory area
0...255 0x0000...0x00FF %QW0...%QW255 Physical Output Area
256...511 0x0100...0x01FF - MODBUS Exception: "Illegal data address"
512...767 0x0200...0x02FF %QW0...%QW255 Physical Output Area
768...4095 0x0300...0x0FFF - MODBUS Exception: "Illegal data address"
4096...12287 0x1000...0x2FFF -
12288...65535 0x3000...0xFFFF -
Configuration register (see Section
"Configuration Register")
MODBUS Exception: "Illegal data address"
Manual
Version 1.0.0
104 Fieldbus Communication
10.1.4.2 Bit Access
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Digital MODBUS services are bit access processes used to determine or change the statuses of digital input/output modules. These services do not reach complex
I/O modules; they are simply disregarded.
Read bit access (with FC1 and FC2)
Table 73: Read bit access (with FC1 and FC2)
MODBUS Address IEC-61131
Address
[dec]
0...511
[hex]
0x0000...0x01FF Depending on the node configuration
512...1023 0x0200...0x03FF Depending on the node configuration
1024... 65535 0x0400...0xFFFF -
Description
First 512 digital inputs
First 512 digital outputs
MODBUS Exception: "Illegal data address"
Bit Access Writing (with FC5 and FC15)
Table 74: Bit access writing (with FC5 and FC15)
MODBUS address
[dec] [hex]
Memory range Description
0...511 0x0000...0x01FF Physical intput area First 512 digital outputs
512...1023 0x0200...0x03FF Physical output area First 512 digital outputs
1024...65535 0x0400...0xFFFF - MODBUS exception: “Illegal data address”
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Fieldbus Communication 105
10.1.5 MODBUS Registers
0x1051 R
0x2000 R
0x2001 R
0x2002 R
0x2003 R
0x2004 R
0x2005 R
0x2006 R
0x2007 R
0x2008 R
0x2010 R
0x2011 R
0x2012 R
0x2013 R
0x2014 R
0x2020 R
0x2021 R
0x2022 R
Table 75: MODBUS Registers
Register address
Access Length
(word)
0x1000 R/W 1
0x1001 R/W 1
0x1002 R/W 1
0x1003 R/W 1
Description
Watchdog time read/write
Watchdog coding mask 1…16
Watchdog coding mask 17…32
Watchdog trigger
0x1004 R 1
0x1005 R/W 1
Minimum trigger time
Watchdog stop (Write sequence 0xAAAA, 0x5555)
0x1006 R 1
0x1007 R/W 1
0x1008 R/W 1
0x1020 R 1…2
0x1021 R
0x1022 R
0x1023 R
0x1024 R
1
0x1025 R
0x1026 R
0x1027 R/W 1
0x1028 R 9
1…4
1…3
1…2
1…4
Watchdog status
Restart watchdog (Write sequence 0x1)
Stop watchdog (Write sequence 0x55AA or 0xAA55)
LED error code
LED error argument
Number of analog output data in the process image (in bits)
Number of analog input data in the process image (in bits)
Number of digital output data in the process image (in bits)
Number of digital input data in the process image (in bits)
Current node address
Modbus configuration
Configuration of the communication interface
0x1040 R/W Process data communication channel
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
32
16
16
Diagnosis of the connected I/O modules
Constant 0x0000
Constant 0xFFFF
Constant 0x1234
Constant 0xAAAA
Constant 0x5555
Constant 0x7FFF
Constant 0x8000
Constant 0x3FFF
Constant 0x4000
Firmware version
Series code
Fieldbus coupler/controller code
Firmware version major revision
Firmware version minor revision
Short description controller
Compile time of the firmware
Compile date of the firmware
10.1.5.1 Accessing Register Values
You can use any MODBUS application to access (read from or write to) register values. Both commercial (e.g., "Modscan") and free programs (from http://www.modbus.org/tech.php
) are available.
The following sections describe how to access both the registers and their values.
Manual
Version 1.0.0
106 Fieldbus Communication
10.1.5.2 Watchdog Registers
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
The watchdog monitors the data transfer between the fieldbus master and the controller. Every time the controller receives a specific request (as define in the watchdog setup registers) from the master, the watchdog timer in the controller resets.
In the case of fault free communication, the watchdog timer does not reach its end value. After each successful data transfer, the timer is reset.
If the watchdog times out, a fieldbus failure has occurred. In this case, the fieldbus controller answers all following MODBUS TCP/IP requests with the exception code 0x0004 (Slave Device Failure).
In the controller special registers are used to setup the watchdog by the master
(Register addresses 0x1000 to 0x1008).
By default, the watchdog is not enabled when you turn the controller on. To activate it, the first step is to set/verify the desired time-out value of the Watchdog
Time register (0x1000). Second, the function code mask must be specified in the mask register (0x1001), which defines the function code(s) that will reset the timer for the first time. Finally, the Watchdog-Trigger register (0x1003) or the register 0x1007 must be changed to a non-zero value to start the timer subsequently.
Reading the Minimum Trigger time (Register 0x1004) reveals whether a watchdog fault occurred. If this time value is 0, a fieldbus failure is assumed. The timer of watchdog can manually be reset, if it is not timed out, by writing a value of 0x1 to the register 0x1003 or to the Restart Watchdog register 0x1007.
After the watchdog is started, it can be stopped by the user via the Watchdog Stop register (0x1005) or the Simply Stop Watchdog register (0x1008).
The watchdog registers can be addressed in the same way as described with the
MODBUS read and write function codes. Specify the respective register address in place of the reference number.
Table 76: Register Address 0x1000
Register address 0x1000 (4096 dec
)
Value Watchdog time, WS_TIME
Access
Default
Description
Read/write
0x0000
This register stores the watchdog timeout value. However, a non zero value must be stored in this register before the watchdog can be triggered. The time value is stored in multiples of 100ms (e.g., 0x0009 is .9 seconds). It is not possible to modify this value while the watchdog is running.
There is no code, by which the current data value can be written again, while the watchdog is active.
Manual
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Fieldbus Communication 107
Table 77: Register Value 0x1001
Register address 0x1001 (4097 dez
)
Value Watchdog function coding screen, function code 1...16, WDFCM_1_16
Access
Default
Description
Read/write
0xFFFF
Use this screen to set the function codes to trigger the watchdog function. With a
“1” on the bit position described below, the function code can be selected:
FC 1 Bit 0
FC 2 Bit 1
FC 3 Bit 2
FC 4 Bit 3
FC 5 Bit 4
...
FC 16 Bit 15
The registry value can only be modified if the watchdog is not active. The bit pattern saved in the registry specifies, which function codes trigger the watchdog.
Some function codes are not supported. Values can be entered for these, but the watchdog does not start even if another MODBUS device sends it.
Table 78: Register Value 0x1002
Register address 0x1002 (4098 dez
)
Value Watchdog function coding screen, function code 17...32, WD_FCM_17_32
Access
Default
Description
Read/write
0xFFFF
The same function as before, but with function codes 17 to 32.
FC 17 Bit 0
FC 18 Bit 1
...
FC 32 Bit 15
These codes are not supported. Therefore, this register should be left at the default value. The registry value can only be modified if the watchdog is not active. There is no exception code by which the current data value can be written again while the watchdog is active.
Table 79: Register Value 0x1003
Register address 0x1003 (4099 dez
)
Value Watchdog trigger, WD_TRIGGER
Access
Default
Description
Read/write
0x0000
This register is used for an alternative trigger method. The watchdog is triggered by writing different values to this register. Successive values must differ in size.
The watchdog starts when values not equal to zero are written after a PowerOn.
The written value may not be equal to the previously written value for a restart!
A watchdog error is reset and it is again possible to write process data.
Manual
Version 1.0.0
108 Fieldbus Communication WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 80: Register Value 0x1004
Register address 0x1004 (4100 dez
)
Value Minimum current trigger time, WD_AC_TRG_TIME
Access
Default
Description
Read
0xFFFF
This register saves the current smallest watchdog trigger time. When the watchdog is triggered, the saved value is compared to the current value. If the current value is smaller than the saved value, it is replaced by the current value.
The unit is 100 ms/digit. The saved value is modified by writing new values. This has no effect on the watchdog. The value 0x000 is not permitted.
Table 81: Register Value 0x1005
Register address 0x1005 (4101 dez
)
Value Stop watchdog, WD_AC_STOP_MASK
Access Read/write
Default 0x0000
Description If the value 0xAAAA followed by the value 0x5555 is written to this register, the watchdog stops. The watchdog error response is blocked. A watchdog error is reset and it is again possible to write to the process data.
Table 82: Register Value 0x1006
Register address 0x1006 (4102 dez
)
Value While watchdog is running, WD_RUNNING
Access
Default
Description
Read
0x0000
Current watchdog status at 0x0000: Watchdog inactive at 0x0001: Watchdog active at 0x0002: Watchdog timed out
Table 83: Register Value 0x1007
Register address 0x1007 (4103 dez
)
Value Restart watchdog, WD_RESTART
Access
Default
Description
Read/write
0x0001
Writing 0x1 to the register starts the watchdog again.
If the watchdog was stopped before the overflow, it is not started again.
Table 84: Register Value 0x1008
Register address 0x1008 (4104 dez
)
Value Just pause watchdog, WD_AC_STOP_SIMPLE
Access
Default
Description
Read/write
0x0000
By writing the values 0x0AA55 or 0x55AA, the watchdog is paused if active.
The watchdog error response is temporarily disabled. An existing watchdog error is reset and it is again possible to write to the watchdog register.
The length of each register is 1 word; i.e., with each access only one word can be written or read. Following are two examples of how to set the value for a time overrun:
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Fieldbus Communication 109
Setting the watchdog for a timeout of more than 1 second:
1. Write 0x000A in the register for time overrun (0x1000).
Register 0x1000 works with a multiple of 100 ms;
1 s = 1000 ms; 1000 ms / 100 ms = 10 dec
= A hex
)
2. Use the function code 5 to write 0x0010 (=2
(5-1)
) in the coding mask
(register 0x1001).
Table 85: Starting Watchdog
FC FC16 FC15 FC14 FC13 FC12 FC11 FC10 FC9 FC8 FC7 FC6 FC5 FC4 FC3 FC2 FC1
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 bin 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 hex 0 0 1 0
Function code 5 (writing a digital output bit) continuously triggers the watchdog to restart the watchdog timer again and again within the specified time. If time between requests exceeds 1 second, a watchdog timeout error occurs.
3. To stop the watchdog, write the value 0xAA55 or 0x55AA into 0x1008
(Simply Stop Watchdog register, WD_AC_STOP_SIMPLE).
Setting the watchdog for a timeout of 10 minutes or more:
1. Write 0x1770 (= 10*60*1000 ms / 100 ms) in the register for time overrun
(0x1000).
(Register 0x1000 works with a multiple of 100 ms;
10 min = 600,000 ms; 600,000 ms / 100 ms = 6000dec = 1770hex)
2. Write 0x0001 in the watchdog trigger register (0x1003) to start the watchdog.
3. Write different values (e.g., counter values 0x0000, 0x0001) in the watchdog to trigger register (0x1003).
Values following each other must differ in size. Writing of a value not equal to zero starts the watchdog. Watchdog faults are reset and writing process data is possible again.
4. To stop the watchdog, write the value 0xAA55 or 0x55AA into 0x1008
(Simply Stop Watchdog register, WD_AC_STOP_SIMPLE).
Manual
Version 1.0.0
110 Fieldbus Communication WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
10.1.5.3 Diagnostic Registers
The following registers can be read to determine errors in the node:
Table 86: Register Address 0x1020
Register address 0x1020 (4128 dec
)
Value LedErrCode
Access
Description
Read
Declaration of the error code
Table 87: Register Address 0x1021
Register address 0x1021 (4129 dec
)
Value LedErrArg
Access
Description
Read
Declaration of the error argument
10.1.5.4 Configuration Registers
The following registers contain configuration information of the connected modules:
Table 88: Register Address 0x1022
Register address 0x1022 (4130 dec
)
Value CnfLen.AnalogOut
Access
Description
Read
Number of word-based outputs registers in the process image in bits (divide by
16 to get the total number of analog words)
Table 89: Register Address 0x1023
Register address 0x1023 (4131 dec
)
Value CnfLen.AnalogInp
Access Read
Description Number of word-based inputs registers in the process image in bits (divide by 16 to get the total number of analog words)
Table 90: Register Address 0x1024
Register address 0x1024 (4132 dec
)
Value CnfLen.DigitalOut
Access
Description
Read
Number of digital output bits in the process image
Table 91: Register Address 0x1025
Register address 0x1025 (4133 dec
)
Value CnfLen.DigitalInp
Access
Description
Read
Number of digital input bits in the process image
Manual
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WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Fieldbus Communication 111
Table 92: Register Value 0x1026
Register address 0x1026 (4134 dez
)
Value Current node address
Access
Description
Read
The address is read when power supply is switched on.
Table 93: Register Value 0x1027
Register address 0x1027 (4135 dez
)
Value MODBUS configuration
Access Read
Description D0 – D3:
D4 – D5:
D6:
D7 – D9:
D10:
D11:
D12:
D13:
Baud rate
Byte Frame
Data Length 8/7 Bits
End of Frame Time
RTU/ASCII Mode
Error Check
Watchdog fbconfig.lib
Table 94: Register Value 0x1028
Register address 0x1028 (4136 dez
)
Value Configuration of the communication interface
Access Read/write
Description The low byte corresponds to the required station address.
The high byte is the binary component for the required station address.
High-byte
0x00
*)
Low-byte
0x00
Station address
Determined by rotary encoder switch
0xFF 0x00 0
0xFE 0x01 1
0xFD
…
0x02
0x01
0x00
*)
Default setting
0x02
…
0xFD
0xFE
0xFF
2
…
253
254 illegal
Table 95: Register Address 0x1040
Register address 0x1040 (4160 dec
)
Value Process data communication channel
Access
Description
Read/write
This register has the function of an interface to WAGO-I/OPRO CAA, e.g. for the debugging
Manual
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112 Fieldbus Communication WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 96: Register Address 0x1051
Register address 0x1051 (4177 dec
)
Value Diagnosis of the connected I/O modules at the MODBUS/RTU fieldbus
Access
Description
Read
Diagnosis of the connected I/O modules, length 3 words
Word 1: Number of the module
Word 2: Number of the channel
Word 3: Diagnosis
10.1.5.5 Firmware Information Registers
The following registers contain information on the firmware of the fieldbus coupler/controller:
Table 97: Register Address 0x2010
Register address 0x2010 (8208 dec
) with a word count of 1
Value Revision, INFO_REVISION
Access
Description
Read
Firmware index, e.g. 0005 for version 5
Table 98: Register Address 0x2011
Register address 0x2011 (8209 dec
) with a word count of 1
Value Series code, INFO_SERIES
Access
Description
Read
WAGO serial number, e.g. 0750 for WAGO-I/O-SYSTEM 750
Table 99: Register Address 0x2012
Register address 0x2012 (8210 dec
) with a word count of 1
Value Order number, INFO_ITEM
Access
Description
Read
First part of WAGO order number, e.g. 841 for the controller 750-841 or 341 for the coupler 750-341 etc.
Table 100: Register Address 0x2013
Register address 0x2013 (8211 dec
) with a word count of 1
Value Major sub item code, INFO_MAJOR
Access Read
Description Firmware version Major Revision
Table 101: Register Address 0x2014
Register address 0x2014 (8212 dec
) with a word count of 1
Value Minor sub item code, INFO_MINOR
Access
Description
Read
Firmware version Minor Revision
Manual
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WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Fieldbus Communication 113
Table 102: Register Address 0x2020
Register address 0x2020 (8224 dec
) with a word count of up to 16
Value Description, INFO_DESCRIPTION
Access
Description
Read
Information on the controller, 16 words
Table 103: Register Address 0x2021
Register address 0x2021 (8225 dec
) with a word count of up to 8
Value Description, INFO_DESCRIPTION
Access
Description
Read
Time of the firmware version, 8 words
Table 104: Register Address 0x2022
Register address 0x2022 (8226 dec
) with a word count of up to 8
Value Description, INFO_DATE
Access Read
Description Date of the firmware version, 8 words
10.1.5.6 Constant Registers
The following registers contain constants, which can be used to test communication with the master:
Table 105: Register Address 0x2000
Register address 0x2000 (8192 dec
)
Value Zero, GP_ZERO
Access
Description
Read
Constant with zeros
Table 106: Register Address 0x2001
Register address 0x2001 (8193 dec
)
Value Ones, GP_ONES
Access Read
Description Constant with ones
• –1 if this is declared as "signed int"
• MAXVALUE if it is declared as "unsigned int"
Table 107: Register Address 0x2002
Register address 0x2002 (8194 dec
)
Value 1,2,3,4, GP_1234
Access Read
Description This constant value is used to test the Intel/Motorola format specifier. If the master reads a value of 0x1234, then with Intel format is selected – this is the correct format. If 0x3412 appears, Motorola format is selected.
Manual
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114 Fieldbus Communication WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 108: Register Address 0x2003
Register address 0x2003 (8195 dec
)
Value Mask 1, GP_AAAA
Access
Description
Read
This constant is used to verify that all bits are accessible to the fieldbus master.
This will be used together with register 0x2004.
Table 109: Register Address 0x2004
Register address 0x2004 (8196 dec
)
Value Mask 1, GP_5555
Access
Description
Read
This constant is used to verify that all bits are accessible to the fieldbus master.
This will be used together with register 0x2003.
Table 110: Register Address 0x2005
Register address 0x2005 (8197 dec
)
Value Maximum positive number, GP_MAX_POS
Access
Description
Read
Constant in order to control arithmetic.
Table 111: Register Address 0x2006
Register address 0x2006 (8198 dec
)
Value Maximum negative number, GP_MAX_NEG
Access
Description
Read
Constant in order to control arithmetic
Table 112: Register Address 0x2007
Register address 0x2007 (8199 dec
)
Value Maximum half positive number, GP_HALF_POS
Access Read
Description Constant in order to control arithmetic
Table 113: Register Address 0x2008
Register address 0x2008 (8200 dec
)
Value Maximum half negative number, GP_HALF_NEG
Access
Description
Read
Constant in order to control arithmetic
Manual
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WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
I/O Modules 115
11 I/O Modules
11.1 Overview
For modular applications with the WAGO-I/O-SYSTEM 750/753, different types of I/O modules are available
• Digital Input Modules
• Digital Output Modules
• Analog Input Modules
• Analog Output Modules
• Specialty Modules
• System Modules
For detailed information on the I/O modules and the module variations, refer to the manuals for the I/O modules.
You will find these manuals on the WAGO web pages under www.wago.com
.
More Information about the WAGO-I/O-SYSTEM
Current information on the modular WAGO-I/O-SYSTEM is available in the
Internet under: www.wago.com
.
Manual
Version 1.0.0
116 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
11.2 Structure of Process Data for MODBUS RTU
The process image uses a byte structure (without word alignment) for the
MODBUS RTU fieldbus coupler/controller. The internal mapping method for data greater than one byte conforms to Intel formats.
The following section describes the representation for WAGO-I/O SYSTEM 750 and 753 Series I/O modules in the process image of the MODBUS RTU fieldbus coupler/controller, as well as the configuration of the process values.
Equipment damage due to incorrect address!
To prevent any damage to the device in the field, you must always take the process data for all previous byte or bit-oriented I/O modules into account when addressing an I/O module at any position in the fieldbus node.
11.2.1 Digital Input Modules
Digital input modules output one bit as the process value per signal channel that indicates the status of the respective channel. Bits that represent input process values are entered in the input process image.
Digital input modules with diagnostics have one or more diagnostic bits available in addition to the process data. The diagnostic bits are evaluated by the fieldbus coupler/controller.
If analog input modules are present in the node, the digital input/output module data is grouped in bytes and added to the analog input module data in the input process image.
1-Channel Digital Input Modules with Diagnostics
750-435
Table 114: 1-Channel Digital Input Modules with Status
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Status bit
S 1
Bit 0
Data bit
DI 1
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750-316/300-000 Fieldbus Coupler MODBUS RTU
2-Channel Digital Input Modules
I/O Modules 117
750-400, -401, -405, -406, -410, -411, -412, -425, -427, -438, (and all variants),
753-400, -401, -405, -406, -410, -411, -412, -425, -427
Table 115: 2-Channel Digital Input Modules
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Data bit
DI 2
Channel 2
Bit 0
Data bit
DI 1
Channel 1
2-Channel Digital Input Modules with Diagnostics
750-400, -401, -410, -411, -419, -421, -424, -425
753-400, -401, -410, -411, -421, -424, -425
Table 116: 2-Channel Digital Input Modules with Diagnostics
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Data bit
DI 2
Channel 2
Bit 0
Data bit
DI 1
Channel 1
2-Channel Digital Input Modules with Diagnostics and Output Data
750-418, -419, -421
753-418, -421
In addition to process values in the input process image, the digital input module also provides 4 bits of data in the output process image.
Table 117: 2-channel digital input modules with diagnostics and output data
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Data bit
DI 2
Channel 2
Data bit
DI 1
Channel 1
Output process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2
Acknowledge
Acknowledg ment bit Q 2 ement bit Q
1
Channel 2
Channel 1
Bit 1
0
Bit 0
0
Manual
Version 1.0.0
118 I/O Modules
4-Channel Digital Input Modules
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
750-402, -403, -408, -409, -414, -415, -422, -423, -428, -432, -433
753-402, -403, -408, -409, -415, -422, -423, -428, -432, -433, -440
Table 118: 4-channel digital input modules
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Data bit
DI 4
Channel 4
Bit 2
Data bit
DI 3
Channel 3
Bit 1
Data bit
DI 2
Channel 2
Bit 0
Data bit
DI 1
Channel 1
8-Channel Digital Input Modules
750-430, -431, -436, -437
753-430, -431, -434
Table 119: 8-Channel Digital Input Modules
Input process image
Bit 7 Bit 6
Data bit
DI 8
Channel 8
Data bit
DI 7
Channel 7
Bit 5
Data bit
DI 6
Channel 6
Bit 4
Data bit
DI 5
Channel 5
Bit 3
Data bit
DI 4
Channel 4
Bit 2
Data bit
DI 3
Channel 3
Bit 1
Data bit
DI 2
Channel 2
Bit 0
Data bit
DI 1
Channel 1
16-Channel Digital Input Modules
750-1400, -1402, -1405, -1406, -1407
Table 120: 16-Channel Digital Input Modules
Input process image
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Data bit
Data bit
Data bit
Data bit
Data bit
Data bit
Data bit
Data bit
DI 16 DI 15 DI 14 DI 13 DI 12 DI 11 DI 10 DI 9
Data bit
DI 8
Data bit
DI 7
Data bit
DI 6
Data bit
DI 5
Data bit
DI 4
Data bit
DI 3
Data bit
DI 2
Data bit
DI 1
Chann Chan Chan Chan Chan Chan Chann el 16 nel 15 nel 14 nel 13 nel 12 nel 11 el 10
Chan nel 9
Chan nel 8
Chan nel 7
Chan nel 6
Chan nel 5
Chan nel 4
Chan nel 3
Chan nel 2
Chan nel 1
11.2.2 Digital Output Modules
The digital output modules contain one bit as the process value per channel that indicates the status of the respective channel. These bits are mapped into the output process image.
Digital output modules with diagnostics have one or more diagnostic bits available. The diagnostic bits are evaluated by the fieldbus coupler/controller. In the event of a diagnostic message, the fieldbus coupler enters the state of the diagnostic bit in the diagnostic status word. The entries in the diagnostic status word are made channel-specific.
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
I/O Modules 119
If analog output modules are in the node, the data for the digital input/output modules is always grouped in bytes and added after the analog output data in the output process image.
1-Channel Digital Output Modules with Input Data
750-523
In addition to the process value bit in the output process image, the digital output modules also provides 1 bit that is represented in the input process image. This status image shows “Manual operation”.
Table 121: 1-Channel Digital Output Modules with Input Data
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Output process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Bit 2
Bit 2
Bit 1 not used
Bit 0
Status bit
"Manual operation"
Bit 1 not used
Bit 0
Controls
DO 1
Channel 1
2-Channel Digital Output Modules
750-501, -502, -509, -512, -513, -514, -517, -535, (and all variants),
753-501, -502, -509, -512, -513, -514, -517
Table 122: 2-Channel Digital Output Modules
Output process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Controls
DO 2
Channel 2
Bit 0
Controls
DO 1
Channel 1
2-Channel Digital Output Modules with Input Data
750-507 (-508), -522,
753-507
Table 123: 2-Channel Digital Output Modules with Input Data
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Diag. bit S2 Diag. bit S1
Channel 2 Channel 1
Manual
Version 1.0.0
120 I/O Modules
Output process image
Bit 7 Bit 6
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Controls
DO 2
Channel 2
Bit 0
Controls
DO 1
Channel 1
750-506,
753-506
In addition to the 4-bit process values in the output process image, the 750-506 and 753-506 digital input modules provide 4 bits of data in the input process image. A diagnostic bit for each output channel indicates an overload, a short circuit or a wire break via a 2-bit error code.
Table 124: 4-Channel Digital Output Modules 75x-506 with Input Data
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Diag. bit S3 Diag. bit S2 Diag. bit S1 Diag. bit S0
Channel 2 Channel 2 Channel 1 Channel 1
Output process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 not used not used
Bit 1
Controls
DO 2
Channel 2
Bit 0
Controls
DO 1
Channel 1
4-Channel Digital Output Modules
750-504, -516, -519, -531
753-504, -516, -531, -540
Table 125: 4-Channel Digital Output Modules
Output process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Controls
DO 4
Channel 4
Bit 2
Controls
DO 3
Channel 3
Bit 1
Controls
DO 2
Channel 2
Bit 0
Controls DO
1
Channel 1
4-Channel Digital Output Modules with Input Data
750-532
In addition to the 4-bit process values in the output process image, the 750-532 digital output modules provide 4 bits of data in the input process image. A diagnostic bit for each output channel indicates an overload, short circuit or wire break.
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
I/O Modules 121
Table 126: 4-Channel Digital Output Modules 750-532 with Input Data
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Diag. bit S3 Diag. bit S2 Diag. bit S1 Diag. bit S0
Channel 4 Channel 3 Channel 2 Channel 1
Diag. bit S = '0' no error
Diag. bit S = '1' wire break, short circuit or overload
Output process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Controls
DO 4
Channel 4
Bit 2
Controls
DO 3
Channel 3
Bit 1
Controls
DO 2
Channel 2
Bit 0
Controls
DO 1
Channel 1
8-Channel Digital Output Modules
750-530, -536
753-530, -534
Table 127: 8-Channel Digital Output Modules
Output process image
Bit 7 Bit 6
Controls
DO 8
Channel 8
Controls
DO 7
Channel 7
Bit 5
Controls
DO 6
Channel 6
Bit 4
Controls
DO 5
Channel 5
Bit 3
Controls
DO 4
Channel 4
Bit 2
Controls
DO 3
Channel 3
Bit 1 Bit 0
Controls
DO 2
Channel 2
Controls DO
1
Channel 1
8-Channel Digital Output Modules with Input Data
750-537
In addition to the 8-bit process values in the output process image, the digital output modules provide 8 bits of data in the input process image. A diagnostic bit for each output channel indicates an overload, short circuit or wire break.
Table 128: 4-Channel Digital Output Modules 750-537 with Input Data
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Diag. bit
S7
Channel 8
Diag. bit S6 Diag. bit S5
Channel 7 Channel 6
Diag. bit S4 Diag. bit S3 Diag. bit S2 Diag. bit S1 Diag. bit S0
Channel 5 Channel 4 Channel 3 Channel 2 Channel 1
Diag. bit S = '0' no error
Diag. bit S = '1' wire break, short circuit or overload
Output process image
Bit 7 Bit 6
Controls
DO 8
Channel 8
Controls
DO 7
Channel 7
Bit 5
Controls
DO 6
Channel 6
Bit 4
Controls
DO 5
Channel 5
Bit 3
Controls
DO 4
Channel 4
Bit 2
Controls
DO 3
Channel 3
Bit 1
Controls
DO 2
Channel 2
Bit 0
Controls
DO 1
Channel 1
Manual
Version 1.0.0
122 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
16-Channel Digital Output Modules
750-1500, -1501, -1504, -1505
Table 129: 16-Channel Digital Output Modules
Output process image
Bit 15
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Control s
Control Control Control Control Control Control Control Control Control Control Control Control Control Control Control s s DO s s s s s s s s s s s s s
DO 16 DO 15 14 DO 13 DO 12 DO 11 DO 10 DO 9 DO 8 DO 7 DO 6 DO 5 DO 4 DO 3 DO 2 DO 1
Channel Channe Channe Channe Channe Channe Channel Channe Channe Channe Channe Channe Channe Channe Channe Channe
16 l 15 l 14 l 13 l 12 l 11 10 l 9 l 8 l 7 l 6 l 5 l 4 l 3 l 2 l 1
8-Channel Digital Input/Output Modules
750-1502, -1506
The digital input/output modules provide 8-bit process values in the input and output process image.
Table 130: 8-Channel Digital Input/Output Modules
Input process image
Bit 7
Data bit
DI 8
Channel 8
Bit 6
Data bit
DI 7
Channel 7
Bit 5
Data bit
DI 6
Channel 6
Bit 4
Data bit
DI 5
Channel 5
Bit 3
Data bit
DI 4
Channel 4
Output process image
Bit 7 Bit 6
Controls
DO 8
Channel 8
Controls
DO 7
Channel 7
Bit 5
Controls
DO 6
Channel 6
Bit 4
Controls
DO 5
Channel 5
Bit 3
Controls
DO 4
Channel 4
Bit 2
Data bit
DI 3
Channel 3
Bit 2
Controls
DO 3
Channel 3
Bit 1
Data bit
DI 2
Channel 2
Bit 0
Data bit
DI 1
Channel 1
Bit 1 Bit 0
Controls
DO 2
Channel 2
Controls DO
1
Channel 1
11.2.3 Analog Input Modules
The analog input modules provide 16-bit measured values. In the input process image, 16-bit measured values for each channel are mapped in Intel format byte by byte for the MODBUS RTU fieldbus coupler/controller.
Information on the structure of control and status bytes
For detailed information on the structure of a particular I/O module’s control/status bytes, please refer to that module’s manual. Manuals for each module can be found on the Internet at www.wago.com
.
When digital input modules are also present in the node, the analog input data is always mapped into the Input Process Image in front of the digital data.
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
1-Channel Analog Input Modules
750-491 (and all variants)
I/O Modules 123
Table 131: 1-Channel Analog Input Modules
Input Process Image
Sub-
Index
Offset Byte Designation n n+1
0
1
2
3
D0
D1
D2
D3
Remark
Measured value U
D
Measured value U ref
2-Channel Analog Input Modules
750-452, -454, -456, -461, -462, -465, -466, -467, -469, -472, -474, -475, 476, -
477, -478, -479, -480, -481, -483, -485, -492, (and all variants),
753-452, -454, -456, -461, -465, -466, -467, -469, -472, -474, -475, 476, -477,
478, -479, -483, -492, (and all variants)
Table 132: 2-Channel Analog Input Modules
Input Process Image
Sub-
Index
Offset Byte Designation n n+1
0
1
2
3
D0
D1
D2
D3
Remark
Measured value channel 1
Measured value channel 2
4-Channel Analog Input Modules
750-450, -453, -455, -457, -459, -460, -468, (and all variants),
753-453, -455, -457, -459
Table 133: 4-Channel Analog Input Modules
Input Process Image
Sub-
Index
Offset Byte Designation n n+1 n+2 n+3
4
5
6
7
0
1
2
3
D0
D1
D2
D3
D4
D5
D6
D7
Remark
Measured value channel 1
Measured value channel 2
Measured value channel 3
Measured value channel 4
Manual
Version 1.0.0
124 I/O Modules
8-Channel Analog Input Modules
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
750-451
Table 134: 8-Channel Analog Input Modules
Input Process Image
Sub-
Index
Offset Byte Designation n n+1 n+2 n+3 n+4 n+5 n+6 n+7
11
12
13
14
15
7
8
9
10
4
5
6
0
1
2
3
D7
D8
D9
D10
D11
D12
D13
D14
D15
D0
D1
D2
D3
D4
D5
D6
Remark
Measured value channel 1
Measured value channel 2
Measured value channel 3
Measured value channel 4
Measured value channel 5
Measured value channel 6
Measured value channel 7
Measured value channel 8
11.2.4 Analog Output Modules
The analog output modules provide 16-bit measured values.
In the output process image, 16-bit measured values for each channel are mapped in Intel format byte by byte for the MODBUS RTU fieldbus coupler/controller.
When digital output modules are also present in the node, the analog output data is always mapped into the Output Process Image in front of the digital data.
Information on the structure of control and status bytes
For detailed information on the structure of a particular I/O module’s control/status bytes, please refer to that module’s manual. Manuals for each module can be found on the Internet at www.wago.com
.
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
2-Channel Analog Output Modules
750-550, -552, -554, -556, -560, -585, (and all variants),
753-550, -552, -554, -556
Table 135: 2-Channel Analog Output Modules
Output process image
Subindex
Offset Byte designation n n+1
0
1
2
3
D0
D1
D2
D3
4-Channel Analog Output Modules
750-553, -555, -557, -559,
753-553, -555, -557, -559
Table 136: 4-Channel Analog Output Modules
Output process image
Subindex
Offset Byte designation n n+1 n+2 n+3
3
4
5
6
7
0
1
2
D0
D1
D2
D3
D4
D5
D6
D7
I/O Modules 125
Remark
Output value channel 1
Output value channel 2
Remark
Output value channel 1
Output value channel 2
Output value channel 3
Output value channel 4
Manual
Version 1.0.0
126 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
8-Channel Analog Output Modules
Table 137: 8-Channel Analog Output Modules
Output process image
Subindex
Offset Byte designation n n+1 n+2 n+3 n+4 n+5 n+6 n+7
8
9
10
11
12
4
5
6
7
0
1
2
3
13
14
15
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
Remark
Output value channel 1
Output value channel 2
Output value channel 3
Output value channel 4
Output value channel 5
Output value channel 6
Output value channel 7
Output value channel 8
11.2.5 Specialty Modules
In addition to the data bytes, the control/status byte is also displayed for select I/O modules. This byte is used for the bi-directional data exchange of the I/O module with the higher-level control system.
The control byte is transferred from the control system to the I/O module and the status byte from the I/O module to the control system. As a result, it is possible to set the counter with the control byte or indicate a range overflow/underflow with the status byte.
The control/status byte is always in the low byte in the process image.
Information about the control/status byte structure
Please refer to the corresponding description of the I/O modules for the structure of the control/status bytes. You can find a manual with the relevant I/O module description at: http://www.wago.com
.
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Counter Modules
I/O Modules 127
750-: 404 (and all variants except /000-005)
753-: 404 (and version /000-003)
In the input and output process image, counter modules occupy 5 bytes of user data: 4 data bytes and 1 additional control/status byte. The I/O modules then provide 32-bit counter values. Three words are assigned in the process image via word alignment.
Table 138: Counter Modules 750-404, 753-404
Input process image
Sub-
Index
Offset
0 S n
1
2
3
4
5
-
D0
D1
D2
D3
Table 139: Counter Modules 750-404, 753-404
Output process image
Sub-
Index
Offset n
0
1
2
3
4
5
Byte designation
Byte designation
C
-
D0
D1
D2
D3
750-404/000-005
Remark
Status byte not used
Counter value
Remark
Status byte not used
Counter value
In the input and output process images, counter modules occupy a total of 5 bytes of user data: 4 data bytes and 1 additional control/status byte. The I/O modules then provide 16-bit counter values per counter. Three words are assigned in the process image via word alignment.
Table 140: Counter Modules 750-404/000-005
Input process image
Sub-
Index
Offset Byte designation n
0
1
2
3
4
5
S
-
D0
D1
D2
D3
Remark
Status byte not used
Counter value of counter 1
Counter value of counter 2
Manual
Version 1.0.0
128 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 141: Counter Modules 750-404/000-005
Output process image
Sub-
Index
Offset Byte designation n
0
1
2
3
4
5
C
-
D0
D1
D2
D3
Remark
Control byte not used
Counter setting value counter 1
Counter setting value counter 2
750-638,
753-638
In the input and output process image, counter modules occupy 6 bytes of user data, 4 data bytes and two additional control/status bytes. The I/O modules then provide 16-bit counter values. 6 bytes are occupied in the process image.
Table 142: Counter Modules 750-638, 753-638
Input process image
Subindex
Offset Byte designation n n+1
0
1
2
3
4
5
S0
D0
D1
S1
D2
D3
Table 143: Counter Modules 750-638, 753-638
Output process image
Subindex
Offset Byte designation n n+1
0
1
2
3
4
5
C0
D0
D1
C1
D2
D3
Remark
Status byte of counter 1
Counter value of counter 1
Status byte of counter 2
Counter value of counter 2
Remark
Control byte of counter 1
Counter value of counter 1
Status byte of counter 2
Counter value of counter 2
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
3-Phase Power Measurement Modules
750-493
I/O Modules 129
In the input and output process image, the 3-phase power measurement modules
750-493 occupy a total of 9 bytes of user data; 6 data bytes and 3 additional control/status bytes. 12 bytes are occupied in the process image.
Table 144: 3-Phase Power Measurement Modules 750-493
Input and Output Process Image
Sub-
Index
Offset Byte designation n n+1 n+2
6
7
8
9
10
11
0
1
2
3
4
5
C0/S0
-
D0
D1
C1/S1
-
D2
D3
C2/S2
-
D4
D5
Remark
Control/status byte of channel 1
Empty byte
Counter value of channel 1
Counter value of channel 1
Control/status byte of channel 2
Empty byte
Counter value of channel 2
Counter value of channel 2
Control/status byte of channel 3
Empty byte
Counter value of channel 3
Counter value of channel 3
750-494, -495
In the input and output process image, the 3-phase power measurement modules
750-494 occupy 24 bytes of user data, 16 data bytes and 8 additional control/status bytes. 24 bytes are occupied in the process image.
Table 145: 3-Phase Power Measurement Modules 750-494, -495
Input process image
Sub-
Index n n+1 n+2 n+3 n+4 n+5 n+6 n+7 n+8 n+9 n+10 n+11 n+12 n+13 n+14 n+15
Offset
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Byte designation
S0
S1
S2
S3
S4
S5
S6
S7
D0
D1
D2
D3
D4
D5
D6
D7
Remark
Status word
Expanded status word 1
Expanded status word 2
Expanded status word 3
Process value 1
Process value 2
Manual
Version 1.0.0
130 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Table 145: 3-Phase Power Measurement Modules 750-494, -495
Input process image
Sub-
Index n+16 n+17 n+18 n+19 n+20 n+21 n+22 n+23
Offset
16
17
18
19
20
21
22
23
Byte designation
D8
D9
D10
D11
D12
D13
D14
D15
Remark
Process value 3
Process value 4
Table 146: 3-Phase Power Measurement Modules 750-494, -495
Output process image
Offset
17
18
19
20
13
14
15
16
21
22
23
7
8
9
10
3
4
5
6
11
12
0
1
2
Sub-
Index n n+1 n+2 n+13 n+14 n+15 n+16 n+17 n+18 n+19 n+20 n+21 n+22 n+3 n+4 n+5 n+6 n+7 n+8 n+9 n+10 n+11 n+12 n+23
Byte designation
C0
C1
C2
C3
C4
C5
C6
C7
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
Remark
Control word
Expanded control word 1
Expanded control word 2
Expanded control word 3 not used
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Pulse Width Modules
750-511, (and all variants / xxx-xxx)
I/O Modules 131
In the input and output process image, pulse width modules occupy 6 bytes of user data, 4 data bytes and two additional control/status bytes. 6 bytes are occupied in the process image.
Table 147: Pulse Width Modules 750-511 / xxx-xxx
Input and Output Process Image
Sub-
Index
Offset Byte designation n n+1
0
1
2
3
4
5
C0/S0
D0
D1
C1/S1
D2
D3
Remark
Control/status byte of channel 1
Data value of channel 1
Control/status byte of channel 2
Data value of channel 2
Serial Interfaces with an Alternative Data Format
750-650, (and the variants /000-002, -004, -006, -009, -010, -011, -012, -013),
750-651, (and the variants /000-001, -002, -003),
750-653, (and the variants /000-002, -007)
The process image of the / 003-000 variants depends on the parameterized operating mode!
The operating mode of the configurable /003-000 I/O module versions can be set.
The structure of the process image of this I/O module then depends on which operating mode is set.
The I/O modules with serial interface that are set to the alternative data format occupy 4 bytes of user data in the input and output area of the process image, 3 data bytes and one additional control/status byte. 4 bytes are occupied in the process image.
Table 148: Serial Interfaces with Alternative Data Format
Input and Output Process Image
Sub-
Index
Offset Byte designation n n+1
0
1
2
3
C/S
D0
D1
D2
Remark
Control/status byte
Data bytes
Manual
Version 1.0.0
132 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Serial Interface with Standard Data Format
750-650/000-001, -014, -015, -016
750-653/000-001, -006
The I/O modules with serial interface that are set to the standard data format occupy 6 bytes of user data in the input and output area of the process image, 5 data bytes and one additional control/status byte. 6 bytes are occupied in the process image.
Table 149: Serial Interface with Standard Data Format
Input and Output Process Image
Subindex
Offset Byte designation n
0
1
2
3
4
5
C/S
D0
D1
D2
D3
D4
KNX/EIB/TP1 Module
753-646
Remark
Control/status byte
Data bytes
In the input and output process image, the KNX/TP1 module occupies 24 bytes of user data in router and device mode, 20 data bytes and 1 control/status byte. Even though the additional bytes S1 or C1 are transferred as data bytes, they are used as extended status and control bytes. The opcode is used for the data read/write command and for triggering specific functions of the KNX/EIB/TP1 module.
Access to the process image is not possible in router mode. Telegrams can only be tunneled. In device mode, access to the KNX data can only be performed via special function blocks of the IEC application. Configuration using the ETS engineering tool software is not required for KNX.
Table 150: Input/Output Process Image of the KNX/EIB/TP1-Module
Input/Output Process Image
Offset Byte designation Remark Sub-
Index n n+1 n+2 n+3 n+4
… n+23
4
…
23
0
1
2
3
-
C0/S0
C1/S1
OP
D0
…
D19 not used
Control/status byte
Additional control/status byte
Opcode
Data byte 0
…
Data byte 19
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
RS-232/RS-485 Serial Interface
750-652
I/O Modules 133
Serial Transmission Mode
The data to be sent and received is stored in up to 46 input and output bytes. The data flow is controlled with the control/status byte. The input bytes form the memory area for up to 46 characters, which were received by the interface. The characters to be sent are passed in the output bytes.
Table 151: Input/Output Process Image “Serial Interface”, Serial Transmission Mode
Input/Output Process Image
Byte designation Remark Sub-
Index n
4
… n+8
…
7
8
… n+23 23
0
1
2
3 n+24 24
… … n+47 47
8 bytes
24 bytes
48 bytes
S0/C0
S1/C1
D0
D1
D2
…
D5
D6
…
D21
D22
…
D45
Control/status byte S0
Control/status byte S1
Data byte 0
Data byte 1
Data byte 2
…
Data byte 5
Data byte 6
…
Data byte 21
Data byte 22
…
Data byte 45
Data Exchange Mode
The data to be sent and received is stored in up to 47 input and output bytes. The data flow is controlled with the control/status byte.
Table 152: Input/Output Process Image “Serial Interface”, Data Exchange Mode
Input/Output Process Image
Byte designation Remark Sub-
Index
Offset
0
1 n
2
3 n+8
… n+23 23 n+24 24
…
7
8
…
… … n+47 47
8 bytes
24 bytes
48 bytes
S0/C0
D0
D1
D2
…
D6
D7
…
D22
D23
…
D46
Control/status byte S0
Data byte 0
Data byte 1
Data byte 2
…
Data byte 6
Data byte 7
…
Data byte 22
Data byte 23
…
Data byte 46
Manual
Version 1.0.0
134 I/O Modules
Data Exchange Module
750-654 (and variant /000-001)
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
In the input and output process image, data exchange modules occupy 4 data bytes. 4 bytes are occupied in the process image.
Table 153: Data Exchange Modules
Input and Output Process Image
Subindex
Offset Byte designation n n+1
0
1
2
3
D0
D1
D2
D3
Remark
Data bytes
SSI Transmitter Interface I/O Modules with an Alternative Data Format
750-630 (and all variants)
The process image of the / 003-000 variants depends on the parameterized operating mode!
The operating mode of the configurable /003-000 I/O module versions can be set.
The structure of the process image of this I/O module then depends on which operating mode is set.
In the input process image, SSI transmitter interface modules with status occupy 4 data bytes. Two words are assigned in the process image via word alignment.
Table 154: SSI transmitter interface modules with alternative data format
Input process image
Subindex
Offset Byte designation n n+1
0
1
2
3
D0
D1
D2
D3
Remark
Data bytes
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
I/O Modules 135
SSI Transmitter Interface Modules with Standard Data Format
750-630/000-004, -005, -007
In the input process image, SSI transmitter interface modules with status occupy 5 bytes of user data; 4 data bytes and one additional status byte. A total of 6 bytes are occupied in the process image.
Table 155: SSI Transmitter Interface Modules with Standard Data Format
Input process image
Subindex
Offset Byte designation n
0
1
2
3
4
5
S
-
D0
D1
D2
D3
Remark
Status byte not used
Data bytes
Distance and Angle Measurement
750-631
The I/O module 750-631 occupies 5 bytes in the input process image and 3 bytes in the output process image. 6 bytes are occupied in the process image.
Table 156: Distance and Angle Measurement Modules
Input process image
Subindex
Offset Byte designation n
3
4
5
0
1
2
S
D0
D1
-
D2
D3
Table 157: Distance and Angle Measurement Modules
Output process image
Subindex
Offset Byte designation n
0
1
2
3
4
5
C
D0
D1
-
-
-
Remark
Status byte
Counter word not used
Latch word
Remark
Control byte
Counter word not used
Manual
Version 1.0.0
136 I/O Modules
750-634
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
The I/O module 750-634 occupies 5 bytes in the input process image, or 6 bytes in cycle duration measurement operating mode, and 3 bytes in the output process image. 6 bytes are occupied in the process image.
Table 158: Incremental Encoder Interface 750-634
Input process image
Subindex
Offset Byte designation Remark
0
1
S
D0
Status byte
2
3
Counter word n
D1
D2
*)
(Cycle duration)
4 D3
Latch word
5 D4
*)
If the control byte sets the operating mode to cycle duration measurement, D2 together with
D3/D4 provides a 24-bit value for the cycle duration.
Table 159: Incremental Encoder Interface, 750-634
Output process image
Subindex
Offset Byte designation n
0
1
2
3
4
5
C
D0
D1
-
-
-
Remark
Status byte
Counter word not used
750-637
The incremental encoder interface module occupies 6 bytes of user data in the input and output area of the process image, 4 data bytes and two additional control/status bytes. 6 bytes are occupied in the process image.
Table 160:Inkremental Encoder Interface, 750-637
Input and Output Process Image
Subindex
Offset Byte designation n n+1
0
1
2
3
4
5
C0/S0
D0
D1
C1/S1
D2
D3
Remark
Control/status byte 1
Data values
Control/status byte 2
Data values
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
750-635,
753-635
I/O Modules 137
In the input and output process image, the digital impulse interface module occupies a total of 4 bytes of user data: 3 data bytes and 1 additional control/status byte. 4 bytes are occupied in the process image.
Table 161: Digitale Impulse Interface, 750-635
Input and Output Process Image
Subindex
Offset Byte designation n
0
1
2
3
C0/S0
D0
D1
D2
Remark
Control/status byte
Data values
RTC module
750-640
In both the input and output process image, the RTC module occupies 6 bytes of user data: 4 data bytes and 1 additional control/status byte, as well as 1 command byte (ID) each. 6 bytes are occupied in the process image.
Table 162: RTC Module, 750-640
Input and Output Process Image
Subindex
Offset Byte designation n
0
1
2
3
4
5
C/S
ID
D0
D1
D2
D3
Remark
Control/status byte
Command byte
Data bytes
Manual
Version 1.0.0
138 I/O Modules
Stepper module
750-670, -671, -672, -673
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
The stepper module makes a 12-byte input/output process image available.
The data to be sent and received is stored in up to 7 input/output bytes depending on the operating mode. If the mailbox is activated, the first 6 data bytes are overlaid with mailbox data.
Table 163: Input Process Image, Stepper Module with Mailbox Deactivated
Input/Output Process Image
Subindex
Offset Byte designation n
4
5
6
0
1
2
3
C0/S0
-
D0
D1
D2
D3
D4
7
8
9
10
11
D5
D6
C3/S3
C2/S2
C1/S1
Remark
Control/status byte
Reserved
Data bytes
Control/status byte
Control/status byte
Control/status byte
Table 164: Output Process Image, Stepper Module with Mailbox Activated
Input/Output Process Image
Subindex
Offset Byte designation n
4
5
6
0
1
2
3
C0/S0
-
MBX0
MBX1
MBX2
MBX3
MBX4
7
8
9
10
11
MBX5
-
C3/S3
C2/S2
C1/S1
Remark
Control/status byte
Reserved
Mailbox bytes
(mailbox activated)
Reserved
Control/status byte
Control/status byte
Control/status byte
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
DALI/DSI Master Module
750-641
I/O Modules 139
In the input and output process image, the DALI/DSI master module occupies a total of 6 data bytes: 5 data bytes and 1 additional control/status byte. 6 bytes are occupied in the process image.
Table 165: DALI/DSI Master Module 750-641
Input process image
Subindex
Offset Byte designation
0
1
S
D0 n
2
3
4
5
D1
D2
D3
D4
Remark
Status byte
DALI response
DALI address
Message 3
Message 2
Message 1
Table 166: DALI/DSI Master Module 750-641
Output process image
Subindex
Offset Byte designation
0
1
C
D0 n
2
3
4
5
D1
D2
D3
D4
DALI Multi-Master Module
753-647
Remark
Control byte
DALI command, DSI dimming value
DALI address
Parameter 2
Parameter 1
Command extension
The DALI Multi-Master module occupies a total of 24 bytes in the input and output range of the process image.
The DALI Multi-Master module can be operated in "Easy" mode (default) and
"Full" mode. "Easy" mode is used to transmit simply binary signals for lighting control. Configuration or programming via DALI master module is unnecessary in "Easy" mode.
Changes to individual bits of the process image are converted directly into DALI commands for a pre-configured DALI network. 22 bytes of the 24-byte process image can be used directly for switching of ECGs, groups or scenes in the Easy mode. Switching commands are transmitted via DALI and group addresses, where each DALI and each group address is represented by a 2-bit pair.
Manual
Version 1.0.0
140 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
The structure of the process data is described in detail in the following tables.
Table 167: Overview of Input Process Image in the “Easy” Mode
Input process image
Sub-
Index
Offset Byte designation n n+1
0
1
S
-
Remark
Status, activate broadcast
Bit 0: 1-/2-button mode
Bit 2: Broadcast status ON/OFF
Bit 1, 3-7: - res. n+2 2 DA0…DA3 n+3 3 DA4…DA7 n+4 n+5 n+6 n+7 n+8 n+9
4
5
6
7
8
9
DA8…DA11
DA12…DA15
DA16…DA19
DA20…DA23
DA24…DA27
DA28…DA31
Bit pair for DALI address DA0: n+10 n+11 n+12 n+13 n+14 n+15 n+16 n+17 n+18 n+19 n+20 n+21
10
11
12
13
14
15
16
17
18
19
20
21
DA32…DA35
DA36…DA39
DA40…DA43
DA44…DA47
DA48…DA51
DA52…DA55
DA56…DA59
DA60…DA63
GA0…GA3
GA4…GA7
GA8…GA11
GA12…GA15
Bit 1: Bit set = ON
Bit not set = OFF
Bit 2: Bit set = Error
Bit not set = No error
Bit pairs DA1 to DA63 similar to DA0.
Bit pair for DALI group address GA0:
Bit 1: Bit set = ON
Bit not set = OFF
Bit 2: Bit set = Error n+22 22 Bit not set = No error n+23 n+24
23
24 n+25
DA = DALI address
GA = Group address
25
-
-
Bit pairs GA1 to GA15 similar to GA0.
Not used
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
I/O Modules 141
Table 168: Overview of the Output Process Image in the “Easy” Mode
Output process image
Sub-
Index
Offset Byte designation n n+1
0
1
S
-
Remark
Broadcast ON/OFF and activate:
Bit 0: Broadcast ON
Bit 1: Broadcast OFF
Bit 2: Broadcast ON/OFF/dimming
Bit 3: Broadcast short ON/OFF
Bit 4…7: reserved res. n+2 2 DA0…DA3 n+3 n+4
3
4
DA4…DA7
DA8…DA11 n+5 n+6 n+7 n+8 n+9 n+10 n+11 n+12 n+13 n+14 n+15 n+16 n+17 n+18 n+19 n+20 n+21
5
15
16
17
18
19
20
12
13
14
6
7
8
9
10
11
21
DA12…DA15
DA16…DA19
DA20…DA23
DA24…DA27
DA28…DA31
DA32…DA35
DA36…DA39
DA40…DA43
DA44…DA47
DA48…DA51
DA52…DA55
DA56…DA59
DA60…DA63
GA0…GA3
GA4…GA7
GA8…GA11
GA12…GA15
Bit pair for DALI address DA0:
Bit 1: short: DA switch ON long: dimming, brighter
Bit 2: short: DA switch OFF long: dimming, darker
Bit pairs DA1 to DA63 similar to DA0.
Bit pair for DALI group address GA0:
Bit 1: short: GA switch ON long: dimming, brighter
Bit 2: short: GA switch OFF n+22 22 long: dimming, darker n+23 n+24
23
24 n+25
DA = DALI address
GA = Group address
25
Bit 0…7
Bit 8…15
Bit pairs GA1 to GA15 similar to GA0.
Switch to scene 0…15
Manual
Version 1.0.0
142 I/O Modules
LON
®
FTT module
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
753-648
The process image of the LON
®
FTT module consists of a control/status byte and
23 bytes of bidirectional communication data that is processed by the WAGO-
I/OPRO function block "LON_01.lib". This function block is required for the function of the LON
®
FTT module and makes a user interface available on the control side.
EnOcean Radio Receiver I/O Module
750-642
In the input and output process image, the EnOcean radio receiver module occupies a total of 4 bytes of user data: 3 data bytes and 1 additional control/status byte. However, the 3 bytes of output data are not used. 4 bytes are occupied in the process image.
Table 169: EnOcean Radio Receiver I/O Module, 750-642
Input process image
Subindex
Offset Byte designation n n+1
0
1
2
3
S
D0
D1
D2
Table 170: EnOcean Radio Receiver I/O Module, 750-642
Output process image
Subindex
Offset Byte designation n n+1
0
1
2
3
C
-
-
-
Remark
Status byte
Data bytes
Remark
Control byte not used
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Bluetooth
®
RF Transceiver
I/O Modules 143
750-644
The size of the process image for the Bluetooth
®
I/O module can be set at a fixed size of 12, 24 or 48 bytes.
It consists of one control byte (input) or one status byte (output), one empty byte, one 6-, 12- or 18-byte overlayable mailbox (mode 2) and the Bluetooth
®
process data with a size of 4 to 46 bytes.
The Bluetooth
®
I/O module uses between 12 to 48 bytes in the process image. The size of the input and output process images are always the same.
The first byte contains the control/status byte; the second contains an empty byte.
Process data attach to this directly when the mailbox is hidden. When the mailbox is visible, the first 6, 12 or 18 bytes of process data are overlaid by the mailbox data, depending on their size. Bytes in the area behind the optionally visible mailbox contain basic process data. The internal structure of the Bluetooth
® process data can be found in the documentation for the Bluetooth
®
RF
Transceivers 750-644.
Table 171: Bluetooth
®
RF Transceiver, 750-644
Input and Output Process Image
Process image size
12 bytes 24 bytes n PDO n+1 PDO
1 status/
Control byte
1 empty byte
6 bytes mailbox or
6 bytes process data
4 bytes process data
4 bytes empty (reserved)
1 status/
Control byte
1 empty byte
6 bytes mailbox or
6 bytes process data
8 bytes process data n+2 PDO free for next I/O module 8 bytes process data n+3 PDO - free for next I/O module n+4 PDO n+5 PDO n+6 PDO
-
-
-
-
-
-
48 bytes
1 status/
Control byte
1 empty byte
6 bytes mailbox or
6 bytes process data
8 bytes process data
8 bytes process data
8 bytes process data
2 bytes process data
8 bytes process data free for next I/O module
These I/O modules appear as follows depending on the data width set:
Data width
1x12 bytes gateway 1 Input
1x12 bytes gateway 1 output
1x24 bytes gateway 1 Input
1x24 bytes gateway 1 output
1x48 bytes gateway 1 Input
1x48 bytes gateway 1 output
One sub-index is assigned per I/O module.
Object
0x4200
0x4300
0x4200
0x4300
0x4200
0x4300
Manual
Version 1.0.0
144 I/O Modules
MP Bus Master Module
750-643
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
In the input and process image, the MP Bus Master module occupies 8 bytes of user data, 6 data bytes and two additional control/status bytes. 8 bytes are occupied in the process image.
Table 172: MP Bus Master Module 750-643
Input and Output Process Image
Sub-
Index
Offset Byte designation n
0
1
2
3
4
5
6
7
C0/S0
C1/S1
D0
D1
D2
D3
D4
D5
Remark
Control/status byte
Additional control/status byte
Vibration Velocity/Bearing Condition Monitoring VIB I/O
750-645
Data bytes
In both the input and the output process image, the vibration velocity/bearing condition monitoring VIB I/O module occupies 12 bytes of user data: 8 data bytes and 4 additional control/status bytes. 12 bytes are occupied in the process image.
Table 173: Vibration Velocity/Bearing Condition Monitoring VIB I/O, 750-645
Input and Output Process Image
Sub-
Index
Offset Byte designation Remark n
0
1
2
C0/S0
D0
D1
Control/status byte
(log. channel 1, sensor input 1)
Data bytes
(log. channel 1, sensor input 1)
Control/status byte
(log. channel 2, sensor input 2) n+1
3 C1/S1 n+2
4
5
6
7
8
D2
D3
C2/S2
D4
D5
Data bytes
(log. channel 2, sensor input 2)
Control/status byte
(log. channel 3, sensor input 1)
Data bytes
(log. channel 3, sensor input 1) n+3
9
10
11
C3/S3
D6
D7
Control/status byte
(log. channel 4, sensor input 2)
Data bytes
(log. channel 4, sensor input 2)
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
DC Drive Controller
750-636
I/O Modules 145
The I/O module occupies 6 bytes of input and output data in the process image.
The position data to be sent and received is stored in 4 output bytes and 4 input bytes. 2 control/status bytes are used to control the I/O module and drive. In addition to the position data in the input process image, extended status information can also be shown.
Table 174: Input Process Image DC Drive Controller, 750-636
Sub-
Index
Offset
Input process image
Byte designation n
0
1
2
3
4
5
D0
D1
D2
D3
S0
S1
S2
S3
S4
S5
Remark
Status byte S0
Status byte S1
Actual position
(LSB)
Ext. status byte S2
Actual position
Actual position
Actual position
(MSB)
Ext. status byte S3
Ext. status byte S4
Ext. status byte S5
Table 175: Output Process Image DC Drive Controller, 750-636
Sub-
Index
Offset
Output process image
Byte designation n
0
1
2
3
4
5
C0
C1
D0
D1
D2
D3
Remark
Control byte C0
Control byte C1
Setpoint position (LSB)
Setpoint position
Setpoint position
Setpoint position (MSB)
Manual
Version 1.0.0
146 I/O Modules
4-Channel I/O-Link Master
750-657
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
In the input and output process image, the I/O module 750-657 occupies a total of
24 bytes of user data, 20 data bytes and 4 additional control/status bytes, mailbox bytes and SIO bytes. n+8 n+9 n+10 n+11 n+12 n+13 n+14 n+15 n+16 n+17 n+18 n+19 n+20 n+21 n+22 n+23
Table 176: Input/Output Process Image, 4-Channel IO Link Master, 750-657
Sub-
Index
Offset
Input/Output Process Image
Byte designation Remark n
17
18
19
20
13
14
15
16
21
22
23
8
9
10
11
12
4
5
6
7
0
1
2
3 4 bytes
6 bytes
8 bytes
10 bytes
12 bytes
16 bytes
20 bytes
24 bytes
D9
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
S0/C0
FC0
MB0
SIO
D0
D1
D2
D3
D4
D5
D6
D7
D8
Control/status byte
Acyclic channel Register byte 0
Mailbox byte Register byte 1
SIO Byte
Data byte 0
Data byte 1
Data byte 2
Data byte 3
Data byte 4
Data byte 5
Data byte 6
Data byte 7
Data byte 8
Data byte 9
Data byte 10
Data byte 11
Data byte 12
Data byte 13
Data byte 14
Data byte 15
Data byte 16
Data byte 17
Data byte 18
Data byte 19
These I/O modules appear as follows depending on the data width set:
Data width
1x4 bytes input data
1x4 bytes output data
1x6 bytes input data
1x6 bytes output data
1x10/12/16/20/24 bytes input data
1x10/12/16/20/24 bytes output data
Object Sub-index
0x2800
0x2900
0x3200
0x3300
0x380n
0x390n
1 sub-index is occupied per I/O module.
One I/O module is mapped per object. Each data byte assigned to one sub-index.
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
CAN Gateway
750-658
I/O Modules 147
The length of the process image of the CAN Gateway I/O module can adjusted to a fixed size of 8, 12, 16, 20, 24, 32, 40 or 48 bytes.
“Sniffer” and “Transparent” Operating Modes n+8 n+9 n+10 n+11 n+12 n+13 n+14 n+15 n+16 n+17 n+18 n+19 n+20 n+21 n+22 n+23 n+24
… n+31 n+32
… n+47
Table 177: CAN Gateway Input/Output Process Image, 750-658
Sub-
Index
Offset
Input/Output Process Image
Byte designation n
23
24
…
31
32
…
47
17
18
19
20
13
14
15
16
21
22
8
9
10
11
12
4
5
6
7
0
1
2
3
8 bytes
12 bytes
16 bytes
20 bytes
24 bytes
32 bytes
48 bytes
D15
D16
…
D23
D24
…
D39
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
S0/C0
MBX0
MBX1
MBX2
MBX3
MBX4
MBX5
MBX6
D0
D1
D2
D3
D4
Remark
Control/status byte
Mailbox byte 0
Mailbox byte 1
Mailbox byte 2
Mailbox byte 3
Mailbox byte 4
Mailbox byte 5
Mailbox byte 6
Data byte 0
Data byte 1
Data byte 2
Data byte 3
Data byte 4
Data byte 5
Data byte 6
Data byte 7
Data byte 8
Data byte 9
Data byte 10
Data byte 11
Data byte 12
Data byte 13
Data byte 14
Data byte 15
Data byte 16
…
Data byte 23
Data byte 24
…
Data byte 39
Manual
Version 1.0.0
148 I/O Modules WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
These I/O modules appear as follows depending on the data width set:
Data width
1x8 bytes input data
1x8 bytes output data
1x12/16/20/24/32/40/48 bytes input data
1x12/16/20/24/32/40/48 bytes output data
Object
0x3600
0x3700
0x380n
0x390n
Sub-index
1 sub-index is occupied per I/O module.
One I/O module is mapped per object. Each data byte assigned to one sub-index.
“Mapped” Operating Mode n+8 n+9 n+10 n+11 n+12 n+13 n+14 n+15 n+16 n+17 n+18 n+19 n+20 n+21 n+22 n+23 n+24
… n+31 n+32
… n+47
Table 178: CAN Gateway Input/Output Process Image, 750-658
Sub-
Index
Offset
Input/Output Process Image
Byte designation n
15
16
17
18
11
12
13
14
19
20
21
31
32
…
47
22
23
24
…
0
5
6
7
8
1
2
3
4
9
10
8 bytes
12 bytes
16 bytes
20 bytes
24 bytes
32 bytes
48 bytes
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
…
D22
D23
…
D38
S0/C0
MBX0
MBX1
MBX2
MBX3
MBX4
MBX5
MBX6
T
D0
D1
Remark
Control/status byte
Mailbox byte 0
Mailbox byte 1
Mailbox byte 2
Mailbox byte 3
Mailbox byte 4
Mailbox byte 5
Mailbox byte 6
Toggle bit
Data byte 0
Data byte 1
Data byte 2
Data byte 3
Data byte 4
Data byte 5
Data byte 6
Data byte 7
Data byte 8
Data byte 9
Data byte 10
Data byte 11
Data byte 12
Data byte 13
Data byte 14
Data byte 15
…
Data byte 22
Data byte 23
…
Data byte 38
Manual
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750-316/300-000 Fieldbus Coupler MODBUS RTU
I/O Modules 149
These I/O modules appear as follows depending on the data width set:
Data width
1x8 bytes input data
1x8 bytes output data
1x12/16/20/24/32/40/48 bytes input data
1x12/16/20/24/32/40/48 bytes output data
Proportional Valve Module
750-632
Object
0x3600
0x3700
0x380n
0x390n
Sub-index
1 sub-index is occupied per I/O module.
One I/O module is mapped per object. Each data byte assigned to one sub-index.
The proportional valve module appears in 1-channel operation (1 valve) with 6 bytes, and in 2-channel operation (2 valves) with 12 Bytes.
1-Channel Mode
Table 179: Proportional Valve Module Input Process Image
Sub-
Index
Offset
Input process image
Byte designation Remark n
0
1
2
3
S0
MBX_ST
MBX_DATA
V1_STATUS
Status byte
Mailbox status byte
Mailbox data
Valve 1 control
4 V1_ACTUAL_L Valve 1, actual value, low byte
5 V1_ACTUAL_H
Table 180: Proportional Valve Module Output Process Image
Valve 1, actual valve, high byte
Sub-
Index
Offset
Output process image
Byte designation Remark n
3
4
5
0
1
2
C0
MBX_CTRL
MBX_DATA
V1_CONTROL
V1_SETPOINTVALUE_L
V1_SETPOINTVALUE_H
Control byte
Mailbox control byte
Mailbox data
Valve 1 control
Valve 1, setpoint, low byte
Valve 1, setpoint, high byte
Manual
Version 1.0.0
150 I/O Modules
2-Channel Mode
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Sub-
Index n n+1 n+2 n+3 n+4 n+5 n+6 n+7 n+8 n+9 n+10 n+11
Table 181: Proportional Valve Module Input Process Image
Sub-
Index n
Offset
Input process image
Byte designation Remark n+1 n+2 n+3 n+4 n+5 n+6 n+7 n+8 n+9 n+10
0
1
2
3
4
5
6
7
8
9
10
S0
MBX_ST
MBX_DATA1
MBX_DATA2
MBX_DATA3
MBX_DATA4
V1_STATUS
V2_STATUS
V1_ACTUAL_L
V1_ACTUAL_H
V2_ACTUAL_L
Status byte
Mailbox status byte
Mailbox data
Valve 1 control
Valve 2 control
Valve 1, actual value, low byte
Valve 1, actual value, low byte
Valve 2, actual value, low byte n+11 11 V2_ACTUAL_H
Table 182: Proportional Valve Module Output Process Image
Valve 2, actual value, low byte
Offset
Output process image
Byte designation Remark
8
9
10
11
4
5
6
7
0
1
2
3
C0
MBX_CTRL
MBX_DATA1
MBX_DATA2
MBX_DATA3
MBX_DATA4
V1_CONTROL
V2_CONTROL
V1_SETPOINTVALUE_L
V1_SETPOINTVALUE_H
V2_SETPOINTVALUE_L
V2_SETPOINTVALUE_H
Control byte
Mailbox control byte
Mailbox data
Valve 1 control
Valve 2 control
Valve 1, setpoint, low byte
Valve 1, setpoint, high byte
Valve 2, setpoint, low byte
Valve 2, setpoint, high byte
AS Interface Master Module
750-655
The process image size for the AS interface master module is adjustable to: 12,
20, 24, 32, 40 or 48 bytes.
It consists of a control or status byte, a mailbox with 0, 6, 10, 12 or 18 bytes and 0 to 32 bytes of AS interface process data.
The AS interface master module occupies 6 to a maximum of 24 words in the process image with word alignment.
The first input or output word contains the status or control byte, and an empty byte.
Manual
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WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
I/O Modules 151
Subsequently, mailbox data is mapped when the mailbox is permanently superimposed (Mode 1).
While in operating mode with a suppressible mailbox (Mode 2), the mailbox and the cyclical process data are mapped next.
The remaining words contain the remaining process data.
The mailbox and the process image sizes are set with the WAGO-I/OCHECK startup tool.
Table 183: AS Interface Master Module, 750-655
Input and Output Process Image
Byte designation
Offset
High byte Low-byte
0 - C0/S0
1
2
3
... max.
23
D1
D3
D5
...
D45
D0
D2
D4
...
D44
11.2.6 System Modules
not used
Remark
Control/status byte
Mailbox (0, 3, 5, 6 or 9 words) and process data (0 ‒ 16 words)
System Modules with Diagnostics
750-610, -611
Power supply modules 750-610 and -611 with diagnostics provide 2 bits to monitor the power supply.
Table 184: System Modules with Diagnostics, 750-610, -611
Input process image
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
Diag. bit
S 2
Fuse
Bit 0
Diag. bit
S 1
Voltage
11.2.6.1 Binary Space Module
750-622
The Binary Space Modules behave alternatively like 2 channel digital input modules or output modules and seize depending upon the selected settings 1, 2, 3 or 4 bits per channel. According to this, 2, 4, 6 or 8 bits are occupied then either in the process input or the process output image.
Table 185: Binary Space Module 750-622 (with Behavior Like 2 Channel Digital Input)
Input and Output Process Image
Bit 7
(Data bit
DI 8)
Bit 6
(Data bit
DI 7)
Bit 5
(Data bit
DI 6)
Bit 4
(Data bit
DI 5)
Bit 3
(Data bit
DI 4)
Bit 2
(Data bit
DI 3)
Bit 1
Data bit
DI 2
Bit 0
Data bit
DI 1
Manual
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152 Use in Hazardous Environments WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
12 Use in Hazardous Environments
The WAGO-I/O-SYSTEM 750 (electrical equipment) is designed for use in
Zone 2 hazardous areas.
The following sections include both the general identification of components
(devices) and the installation regulations to be observed. The individual subsections of the “Installation Regulations” section must be taken into account if the I/O module has the required approval or is subject to the range of application of the ATEX directive.
Manual
Version 1.0.0
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Use in Hazardous Environments 153
12.1 Marking Configuration Examples
12.1.1 Marking for Europe According to ATEX and IEC-Ex
Figure 45: Side Marking Example for ATEX and IEC Ex Approved I/O Modules According to
CENELEC and IEC
Figure 46: Printing Text Detail – Marking Example for ATEX and IEC Ex Approved I/O Modules
According to CENELEC and IEC
Table 186: Description of Marking Example for ATEX and IEC Ex Approved I/O Modules
According to CENELEC and IEC
Printing on Text Description
DEMKO 08 ATEX 142851 X
IECEx PTB 07.0064X
I M2 / II 3 GD
Ex nA
IIC
T4
Approval body and/or number of the examination certificate
Explosion protection group and Unit category
Type of ignition and extended identification
Explosion protection group
Temperature class
Manual
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154 Use in Hazardous Environments WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Figure 47: Side Marking Example for Ex i and IEC Ex i Approved I/O Modules According to
CENELEC and IEC
Figure 48: Text Detail – Marking Example for Ex i and IEC Ex i Approved I/O Modules
According to CENELEC and IEC
Manual
Version 1.0.0
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Use in Hazardous Environments 155
Table 187: Description of Marking Example for Ex i and IEC Ex i Approved I/O Modules
According to CENELEC and IEC
Inscription text
TÜV 07 ATEX 554086 X
TUN 09.0001X
Description
Approving authority or certificate numbers
Dust
II
3(1)D
Ex tD
[iaD]
Device group: All except mining
Device category: Zone 22 device (Zone 20 subunit)
Explosion protection mark
Protection by enclosure
Approved in accordance with "Dust intrinsic safety" standard
A22 Surface temperature determined according to
Procedure A, use in Zone 22
Dust-tight (totally protected against dust)
Max. surface temp. of the enclosure (no dust bin)
IP6X
T 135°C
Mining
I
(M2)
[Ex ia]
Device group: Mining
Device category: High degree of safety
Explosion protection: Mark with category of type of protection intrinsic safety: Even safe when two errors occur
Device group: Mining I
Gases
II
3(1)G
Ex nA
[ia]
IIC
T4
Device group: All except mining
Device category: Zone 2 device (Zone 0 subunit)
Explosion protection mark
Type of protection: Non-sparking operating equipment
Category of type of protection intrinsic safety: Even safe when two errors occur
Explosion Group
Temperature class: Max. surface temperature 135°C
Manual
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156 Use in Hazardous Environments WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
12.1.2 Marking for America According to NEC 500
Figure 49: Side Marking Example for I/O Modules According to NEC 500
Figure 50: Text Detail – Marking Example for I/O Modules According to NEC 500
Table 188: Description of Marking Example for I/O Modules According to NEC 500
Printing on Text
CL 1
DIV 2
Grp. ABCD
Optemp code T4
Description
Explosion protection group (condition of use category)
Area of application (zone)
Explosion group (gas group)
Temperature class
Manual
Version 1.0.0
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Use in Hazardous Environments 157
12.2 Installation Regulations
In the Federal Republic of Germany , various national regulations for the installation in explosive areas must be taken into consideration. The basis for this forms the working reliability regulation, which is the national conversion of the
European guideline 99/92/E6. They are complemented by the installation regulation EN 60079-14. The following are excerpts from additional VDE regulations:
Table 189: VDE Installation Regulations in Germany
DIN VDE 0100 Installation in power plants with rated voltages up to 1000 V
DIN VDE 0101 Installation in power plants with rated voltages above 1 kV
DIN VDE 0800 Installation and operation in telecommunication plants including information processing equipment
DIN VDE 0185 lightning protection systems
The USA and Canada have their own regulations. The following are excerpts from these regulations:
Table 190: Installation Regulations in USA and Canada
NFPA 70 National Electrical Code Art. 500 Hazardous Locations
ANSI/ISA-RP 12.6-1987 Recommended Practice
C22.1 Canadian Electrical Code
Notice the following points
When using the WAGO-I/O SYSTEM 750 (electrical operation) with Ex approval, the following points are mandatory:
Manual
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158 Use in Hazardous Environments WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
12.2.1 Special Conditions for Safe Operation of the ATEX and IEC
Ex (acc. DEMKO 08 ATEX 142851X and IECEx PTB 07.0064)
The fieldbus-independent I/O modules of the WAGO-I/O-SYSTEM 750-.../...-... must be installed in an environment with degree of pollution 2 or better. In the final application, the I/O modules must be mounted in an enclosure with IP 54 degree of protection at a minimum with the following exceptions:
- I/O modules 750-440, 750-609 and 750-611 must be installed in an IP 64 minimum enclosure.
- I/O module 750-540 must be installed in an IP 64 minimum enclosure for
230 V AC applications.
- I/O module 750-440 may be used up to max. 120 V AC.
When used in the presence of combustible dust, all devices and the enclosure shall be fully tested and assessed in compliance with the requirements of IEC 61241-
0:2004 and IEC 61241-1:2004.
When used in mining applications the equipment shall be installed in a suitable enclosure according to EN 60079-0:2006 and EN 60079-1:2007.
I/O modules fieldbus plugs or fuses may only be installed, added, removed or replaced when the system and field supply is switched off or the area exhibits no explosive atmosphere.
DIP switches, coding switches and potentiometers that are connected to the I/O module may only be operated if an explosive atmosphere can be ruled out.
I/O module 750-642 may only be used in conjunction with antenna 758-910 with a max. cable length of 2.5 m.
To exceed the rated voltage no more than 40%, the supply connections must have transient protection.
The permissible ambient temperature range is 0 °C to +55 °C.
Manual
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750-316/300-000 Fieldbus Coupler MODBUS RTU
Use in Hazardous Environments 159
12.2.2 Special conditions for safe use (ATEX Certificate TÜV 07
ATEX 554086 X)
1. For use as Gc- or Dc-apparatus (in zone 2 or 22) the field bus independent
I/O modules WAGO-I/O-SYSTEM 750-*** shall be erected in an enclosure that fulfils the requirements of the applicable standards (see the marking)
EN 60079-0, EN 60079-11, EN 60079-15, EN 61241-0 and EN 61241-1.
For use as group I, electrical apparatus M2, the apparatus shall be erected in an enclosure that ensures a sufficient protection according to EN 60079-0 and EN 60079-1 and the degree of protection IP64. The compliance of these requirements and the correct installation into an enclosure or a control cabinet of the devices shall be certified by an ExNB.
2. If the interface circuits are operated without the field bus coupler station type 750-3../…-… (DEMKO 08 ATEX 142851 X), measures must be taken outside of the device so that the rating voltage is not being exceeded of more than 40% because of transient disturbances.
3. DIP-switches, binary-switches and potentiometers, connected to the module may only be actuated when explosive atmosphere can be excluded.
4. The connecting and disconnecting of the non-intrinsically safe circuits is only permitted during installation, for maintenance or for repair purposes.
The temporal coincidence of explosion hazardous atmosphere and installation, maintenance resp. repair purposes shall be excluded. This is although and in particular valid for the interfaces “CF-Card”, “USB”,
“Fieldbus connection“, “Configuration and programming interface“,
“antenna socket“, “D-Sub“ and the “Ethernet interface“. These interfaces are not energy limited or intrinsically safe circuits. An operating of those circuits is in the behalf of the operator.
5. For the types 750-606, 750-625/000-001, 750-487/003-000, 750-484 and
750-633 the following shall be considered: The interface circuits shall be limited to overvoltage category I/II/III (non mains/mains circuits) as defined in EN 60664-1.
6. For the type 750-601 the following shall be considered: Do not remove or replace the fuse when the apparatus is energized.
7.
The ambient temperature range is: 0°C ≤ T a
≤ +55°C (for extended details please note certificate).
Manual
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160 Use in Hazardous Environments WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
8. The following warnings shall be placed nearby the unit:
Do not remove or replace fuse when energized!
If the module is energized do not remove or replace the fuse.
Do not separate when energized!
Do not separate the module when energized!
Separate only in a non-hazardous area!
Separate the module only in a non-hazardous area!
Manual
Version 1.0.0
WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
Use in Hazardous Environments 161
12.2.3 Special conditions for safe use (IEC-Ex Certificate TUN
09.0001 X)
1. For use as Dc- or Gc-apparatus (in zone 2 or 22) the fieldbus independent
I/O modules WAGO-I/O-SYSTEM 750-*** shall be erected in an enclosure that fulfils the requirements of the applicable standards (see the marking)
IEC 60079-0, IEC 60079-11, IEC 60079-15, IEC 61241-0 and IEC 61241-1.
For use as group I, electrical apparatus M2, the apparatus shall be erected in an enclosure that ensures a sufficient protection according to IEC 60079-0 and IEC 60079-1 and the degree of protection IP64. The compliance of these requirements and the correct installation into an enclosure or a control cabinet of the devices shall be certified by an ExCB.
2. Measures have to be taken outside of the device that the rating voltage is not being exceeded of more than 40% because of transient disturbances.
3. DIP-switches, binary-switches and potentiometers, connected to the module may only be actuated when explosive atmosphere can be excluded.
4. The connecting and disconnecting of the non-intrinsically safe circuits is only permitted during installation, for maintenance or for repair purposes.
The temporal coincidence of explosion hazardous atmosphere and installation, maintenance resp. repair purposes shall be excluded. This is although and in particular valid for the interfaces “CF-Card”, “USB”,
“Fieldbus connection“, “Configuration and programming interface“,
“antenna socket“, “D-Sub“ and the “Ethernet interface“. These interfaces are not energy limited or intrinsically safe circuits. An operating of those circuits is in the behalf of the operator.
5. For the types 750-606, 750-625/000-001, 750-487/003-000, 750-484 and
750-633 the following shall be considered: The interface circuits shall be limited to overvoltage category I/II/III (non mains/mains circuits) as defined in IEC 60664-1.
6. For the type 750-601 the following shall be considered: Do not remove or replace the fuse when the apparatus is energized.
7.
The ambient temperature range is: 0°C ≤ T a
≤ +55°C (For extensions please see the certificate).
Manual
Version 1.0.0
162 Use in Hazardous Environments WAGO-I/O-SYSTEM 750
750-316/300-000 Fieldbus Coupler MODBUS RTU
8. The following warnings shall be placed nearby the unit:
Do not remove or replace fuse when energized!
If the module is energized do not remove or replace the fuse.
Do not separate when energized!
Do not separate the module when energized!
Separate only in a non-hazardous area!
Separate the module only in a non-hazardous area!
Manual
Version 1.0.0
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Table of contents
- 6 Notes about this Documentation
- 6 Validity of this Documentation
- 6 Copyright
- 7 Symbols
- 9 Number Notation
- 9 Font Conventions
- 10 Important Notes
- 10 Legal Bases
- 10 Subject to Changes
- 10 Personnel Qualifications
- 10 Provisions
- 11 Technical Condition of Specified Devices
- 12 Safety Advice (Precautions)
- 14 System Description
- 15 Manufacturing Number
- 16 Component Update
- 16 Storage, Assembly and Transport
- 17 Assembly Guidelines/Standards
- 18 Power Supply
- 18 Isolation
- 19 System Supply
- 19 Connection
- 20 Dimensioning
- 23 Field Supply
- 23 Connection
- 25 Fusing
- 28 Supplementary Power Supply Regulations
- 29 Supply Example
- 31 Power Supply Unit
- 32 Grounding
- 32 Grounding the DIN Rail
- 32 Framework Assembly
- 32 Insulated Assembly
- 33 Grounding Function
- 34 Shielding
- 34 General
- 34 Bus Cables
- 35 Signal Lines
- 35 WAGO Shield Connecting System
- 36 Device Description
- 39 Connectors
- 39 Device Supply
- 40 Fieldbus Connection
- 41 Display Elements
- 42 Operating Elements
- 42 Service Interface
- 43 Mode Selector Switch
- 49 Manual Configuration
- 52 Technical Data
- 52 Device Data
- 52 System Data
- 52 Connection Type
- 53 Climatic Environmental Conditions
- 53 Mechanical Strength acc. to IEC
- 54 Approvals
- 56 Standards and Guidelines
- 57 Mounting
- 57 Installation Position
- 57 Overall Configuration
- 59 Mounting onto Carrier Rail
- 59 Carrier Rail Properties
- 60 WAGO DIN Rail
- 60 Spacing
- 61 Mounting Sequence
- 62 Inserting and Removing Devices
- 63 Inserting the Fieldbus Coupler/Controller
- 63 Removing the Fieldbus Coupler/Controller
- 64 Inserting the I/O Module
- 65 Removing the I/O Module
- 66 Connect Devices
- 66 Data Contacts/Internal Bus
- 67 Power Contacts/Field Supply
- 69 Function Description
- 69 Startup of the Fieldbus Coupler
- 71 Process Data Architecture
- 71 Basic Setup
- 72 Example of an Input Process Image
- 73 Example of an Output Process Image
- 74 Process Data MODBUS RTU
- 75 Data Exchange
- 75 Memory Space
- 76 Addressing
- 76 Adressing the I/O Modules
- 79 Commissioning
- 80 Diagnostics
- 80 LED Signaling
- 81 Evaluating Fieldbus Status
- 82 Evaluating Node Status – I/O LED (Blink Code Table)
- 163 Figure 1: Fieldbus Node (Example)
- 164 Figure 2: Labeling on the Side of a Component (Example)
- 164 Figure 3: Example of a Manufacturing Number
- 167 Figure 4: Isolation for Fieldbus Couplers/Controllers (Example)
- 168 System Supply Module (right)
- 169 Couplers
- 174 Figure 8: Supply Module with Fuse Carrier (Example 750-610)