PLC Connection Guide
MODBUS RTU (0x/1x Range Adjustable)
Supported Series : MODBUS RTU CONTROLLER
Website : http://www.modbus.org
HMI Setting:
Parameters
Recommended
PLC type
MODBUS RTU (0x/1x Range Adjustable)
PLC I/F
RS485
RS232/RS485
Baud rate
9600
9600~115200
Data bits
8
7,8
Parity
Even
Even, Odd, None
Stop bits
1
1,2
PLC sta. no.
1
0-255
Online simulator
YES
Extend address mode
YES
Options
Notes
PLC Setting:
Communication mode
Modbus RTU protocol
Device Address:
Bit/Word Device type
Format
Range
Memo
B
0x
DDDDD
1 ~ 65535
Output bit
B
1x
DDDDD
1 ~ 65535
Input bit (read only)
B
3x_Bit
DDDDDdd
100 ~ 6553515
Input Register bit (read only)
B
4x_Bit
DDDDDdd
100 ~ 6553515
Output Register bit
B
B
6x_Bit
DDDDDdd
0x_multi_coils DDDDD
100 ~ 6553515
1 ~ 65535
Output Register bit
Write multiple coils
W
3x
DDDDD
1 ~ 65535
Input Register (read only)
W
4x
DDDDD
1 ~ 65535
Output Register
DW
5x
DDDDD
1 ~ 65535
4x double word swap
W
W
6x
4x_32Bit*
DDDDD
1 ~ 65535
DDDDD
1 ~ 65535
4x single word write
Output Register
4x_32Bit will only read / write 2 words for each package, for continuous addresses, it will
be divided into several packages.
1
PLC Connection Guide
NOTE:
Address type “5x” is mapping to Hold Reg. The communication protocol of “5x” is almost
the same as “4x” except that “5x” swaps double words.
If 4x contains the following information:
Address
1
2
3
4
5
6
Data in
word
0x1
0x2
0x3
0x4
0x5
0x6
Data
0x20001
0x40003
0x60005
...
For 5x, it will be:
Address
1
2
3
4
5
6
Data in
word
0x2
0x1
0x4
0x3
0x6
0x5
Data
0x10002
0x30004
...
0x50006
Modbus RTU function code:
0x
0x01 Read coil
0x05 Write single coil
0x_multi_coils 0x01 Read coil
0x0f Write multiple coils
1x
0x02 Read discrete input
N/A for writing operation
3x
0x04 Read input register
N/A for writing operation
4x
0x03 Read holding register
0x10 Write multiple registers
5x
0x03 Read holding register
0x10 Write multiple registers
(Note: reverse word order in double words format)
3xbit is equivalent to 3x
4xbit is equivalent to 4x
6x
0x03 Read holding register
0x06 Write single register
(Note: 6x is limited to device of one word only)
2
PLC Connection Guide
Setting Instructions:
1.
Go to [System Parameter Settings]
，click [New] to add a new device -Modbus
RTU (0x 1x range adjustable)，as shown below:
2.
After adding Modbus RTU (0x 1x Range Adjustable) driver, [Add Address Range Limit]
button will be enabled as below. Users can set maximum read/write command size
here.
¾
Max.read-command size (words): Pull down to select PLC reading range.
¾
Max.write-command size (words): Pull down to select PLC writing range.
Note: Setting [Add Address Range Limit] is enabled only when bit address is not a multiple
of 16bit.
3
PLC Connection Guide
3.
Click [Add Address Range Limit] button, Users can define 0x and 1x address range in
[0x 1x Address Range] dialog box, referring to bit range of the device used.
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PLC Connection Guide
Add：Set [Station No.], [Device Type], [Min. Address], [Max. Address] then click [OK] to
finish adding as below:
Delete：The selected items will be deleted.
Settings：Set [Station No.], [Device Type], [Min. Address], [Max. Address] then click [OK]
to finish adding as below:
Example：
Take D2 and D8 of SCON as example, the settings depend on bit range of different PLC
types. Set [Station No.] and address first.
For D2, set [Station No.] to 20, [Device Type] 0x, [Max. Address] 36.
For D8, set [Station No.] to 2, [Device Type] 0x, [Max. Address] 51.
5
PLC Connection Guide
Note: If communicating with a RS-485 2W PLC, the [Turn around delay] setting may need
to be adjusted according to the reply speed of the device. Please click [Settings] in [Device
Properties], and set the [Turn around delay (ms)] parameter as shown:
After completing all settings above, the communication is enabled.
6
PLC Connection Guide
Wiring Diagram:
The following represents the view of HMI & PLC.
MODBUS RTU CONTROLLER : RS232
eMT3000 series
COM1 RS232 9P
D-Sub Female
COM3 RS232 9P
D-Sub Female
RS232 9P D-Sub
Female
2 RX
8 RX
TXD
3 TX
7 TX
RXD
5 GND
5 GND
GND
RTS
CTS
circuit
MT6000/8000 series except MT6050i/MT8050i
COM1 RS232 9P
D-Sub Female
COM2 RS232 9P
D-Sub Female
COM3 RS232 9P
D-Sub Male
RS232 9P D-Sub
Female
2 RX
6 RX
8 RX
TXD
3 TX
4 TX
7 TX
RXD
5 GND
5 GND
5 GND
GND
RTS
CTS
circuit
MT6050i/MT8050i
COM1 RS232 9P
RS232 9P D-Sub
D-Sub Female
Female
9 RX
TXD
6 TX
RXD
5 GND
GND
RTS
CTS
7
circuit
PLC Connection Guide
The following represents the view of HMI & PLC.
MODBUS RTU CONTROLLER : RS485 4W
eMT3000 series
COM1 RS485 4W
9P D-Sub Male
RS485 4W 9P D-Sub
Male
1 RX-
TX-
2 RX+
TX+
3 TX-
RX-
4 TX+
RX+
5 GND
GND
MT6000/8000 series except MT6050i/MT8050i
COM1 RS485 4W
9P D-Sub Male
RS485 4W 9P D-Sub
Male
1 RX-
TX-
2 RX+
TX+
3 TX-
RX-
4 TX+
RX+
5 GND
GND
MT6050i/MT8050i
COM1 RS485 4W
9P D-Sub Female
RS485 4W 9P D-Sub
Female
1 RX-
TX-
2 RX+
TX+
3 TX-
RX-
4 TX+
RX+
5 GND
GND
8
PLC Connection Guide
The following represents the view of HMI & PLC.
MODBUS RTU CONTROLLER : RS485 2W
eMT3000 series
COM1 RS485 2W
9P D-Sub Male
COM3 RS485 2W
9P D-Sub Male
RS485 2W 9P D-Sub
Male
1 RX-
6 Data-
D-
2 RX+
9 Data+
D+
5 GND
5 GND
GND
MT6000/8000 series except MT6050i/MT8050i
COM1 RS485 2W
9P D-Sub Male
COM3 RS485 2W
9P D-Sub Male
RS485 2W 9P D-Sub
Male
1 RX-
6 Data-
D-
2 RX+
9 Data+
D+
5 GND
5 GND
GND
COM1 RS485 2W
9P D-Sub Female
COM3 RS485 2W
9P D-Sub Female
RS485 2W 9P D-Sub
Female
1 RX-
7 Data-
D-
2 RX+
8 Data+
D+
5 GND
5 GND
GND
MT6050i/MT8050i
Driver Version:
Version
Date
V1.10
Aug/25/2010
V1.20
Mar/2/2012
Description
Allow modifying the Minimum address of 0x、1x Address Range.
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