RKC INSTRUMENT SA201 Instruction Manual

Temperature Controller

SA201

Communication

Instruction Manual

®

RKC INSTRUMENT INC.

IMR01K02-E1

the respective companies.

All Rights Reserved, Copyright  2001, RKC INSTRUMENT INC.

Thank you for purchasing the RKC instrument. In order to achieve maximum performance and ensure proper operation of your new instrument, carefully read all the instructions in this manual. Please place this manual in a convenient location for easy reference.

SYMBOLS

WARNING

: This mark indicates precautions that must be taken if there is danger of electric shock, fire, etc., which could result in loss of life or injury.

CAUTION

: This mark indicates that if these precautions and operating procedures are not taken, damage to the instrument may result.

!

: This mark indicates that all precautions should be taken for safe usage.

: This mark indicates important information on installation, handling and operating procedures.

: This mark indicates supplemental information on installation, handling and operating procedures.

: This mark indicates where additional information may be located.

!

WARNING could result in damage to the instrument, equipment or injury to personnel.

shock, fire or damage to instrument and equipment.

fire or damage to instrument and equipment.

explosive gases.

to avoid electric shock.

disassembled by other than factory-approved personnel. Malfunction can occur and warranty is void under these conditions.

IMR01K02-E1 i-1

i-2

CAUTION

!

This is a Class A instrument. In a domestic environment, this instrument may cause radio interference, in which case the user may be required to take adequate measures.

!

This instrument is protected from electric shock by reinforced insulation. Provide reinforced insulation between the wire for the input signal and the wires for instrument power supply, source of power and loads.

!

Be sure to provide an appropriate surge control circuit respectively for the following:

- If input/output or signal lines within the building are longer than 30 meters.

- If input/output or signal lines leave the building, regardless the length.

!

This instrument is designed for installation in an enclosed instrumentation panel. All highvoltage connections such as power supply terminals must be enclosed in the instrumentation panel to avoid electric shock by operating personnel.

!

All precautions described in this manual should be taken to avoid damage to the instrument or equipment.

!

All wiring must be in accordance with local codes and regulations.

!

All wiring must be completed before power is turned on to prevent electric shock, instrument failure, or incorrect action.

The power must be turned off before repairing work for input break and output failure including replacement of sensor, contactor or SSR, and all wiring must be completed before power is turned on again.

!

To prevent instrument damage or failure, protect the power line and the input/output lines from high currents with a protection device such as fuse, circuit breaker, etc.

!

Prevent metal fragments or lead wire scraps from falling inside instrument case to avoid electric shock, fire or malfunction.

!

Tighten each terminal screw to the specified torque found in the manual to avoid electric shock, fire or malfunction.

!

For proper operation of this instrument, provide adequate ventilation for heat dispensation.

!

Do not connect wires to unused terminals as this will interfere with proper operation of the instrument.

!

Turn off the power supply before cleaning the instrument.

!

Do not use a volatile solvent such as paint thinner to clean the instrument. Deformation or discoloration will occur. Use a soft, dry cloth to remove stains from the instrument.

!

To avoid damage to instrument display, do not rub with an abrasive material or push front panel with a hard object.

!

Do not connect modular connectors to telephone line.

NOTICE

!

This manual assumes that the reader has a fundamental knowledge of the principles of electricity, process control, computer technology and communications.

!

The figures, diagrams and numeric values used in this manual are only for purpose of illustration.

!

RKC is not responsible for any damage or injury that is caused as a result of using this instrument, instrument failure or indirect damage.

!

Periodic maintenance is required for safe and proper operation of this instrument. Some components have a limited service life, or characteristics that change over time.

!

Every effort has been made to ensure accuracy of all information contained herein. RKC makes no warranty expressed or implied, with respect to the accuracy of the information. The information in this manual is subject to change without prior notice.

!

No portion of this document may be reprinted, modified, copied, transmitted, digitized, stored, processed or retrieved through any mechanical, electronic, optical or other means without prior written approval from RKC.

IMR01K02-E1

CONTENTS

Page

1. OUTLINE ...............................................................................1

2. SPECIFICATIONS.................................................................2

3. WIRING .................................................................................4

4. SETTING ...............................................................................6

4.1 Transfer to Communication Setting Mode .......................................................6

4.2 Setting the Communication Parameters ..........................................................7

4.3 Communication Requirements ......................................................................11

5. RKC COMMUNICATION PROTOCOL ...............................13

5.1 Polling............................................................................................................13

5.1.1 Polling procedures ............................................................................................14

5.1.2 Polling procedure example ...............................................................................17

5.2 Selecting........................................................................................................18

5.2.1 Selecting procedures ........................................................................................18

5.2.2 Selecting procedure example ...........................................................................21

5.3 Communication Identifier List ........................................................................22

6. MODBUS COMMUNICATION PROTOCOL .......................26

6.1 Message Format............................................................................................26

6.2 Function Code ...............................................................................................27

6.3 Communication Mode....................................................................................27

6.4 Slave Response.............................................................................................28

6.5 Calculating CRC-16 .......................................................................................29

6.6 Message Format............................................................................................31

6.6.1 Reading holding registers [03H]........................................................................31

6.6.2 Preset single resister [06H]...............................................................................32

6.6.3 Diagnostics (loopback test) [08H] .....................................................................33

IMR01K02-E1 i-3

Page

6.7 Data Configuration.........................................................................................34

6.7.1 Data range........................................................................................................34

6.7.2 Data processing precautions ............................................................................35

6.8 Communication Data List...............................................................................36

7. INPUT RANGE TABLES.....................................................40

8. TROUBLESHOOTING ........................................................44

9. ASCII 7-BIT CODE TABLE (RFERENCE)..........................47

i-4

IMR01K02-E1

1. OUTLINE

Temperature controller SA201 interfaces with the host computer via Modbus or RKC communication protocols. For reference purposes, the Modbus protocol identifies the host computer as master, the

SA201 as slave.

Host computer or

PLC, etc.

RS-485

SA201

SA201 or

Host computer or

PLC, etc.

SA201

RS-232C

RS-232C/RS-485 converter

SA201

SA201

SA201

IMR01K02-E1

1

2

2. SPECIFICATIONS

Interface:

Connection method:

Based on RS-485, EIA standard

2-wire system, half-duplex multi-drop connection

Communication distance: 1 km max.

The maximum communication distance will be affected by the surrounding conditions.

Synchronous method: Start/stop synchronous type

Communication speed: 2400 bps, 4800 bps, 9600 bps, 19200 bps

Data bit configuration: Start bit: 1

Data bit: 7 or 8

Parity bit: Without, Odd or Even

Stop bit: 1 or 2

Protocol:

Error control:

Communication code:

ANSI X3.28 subcategory 2.5, A4

Polling/selecting type

Vertical parity (With parity bit selected)

Horizontal parity (BCC check)

ASCII 7-bit code

Termination resistor:

Xon/Xoff control:

Externally connected

None

Maximum connections: 32 instruments maximum including a host computer

Signal logic: RS-485

Signal voltage

V (A) - V (B) ≥ 2 V

V (A) - V (B) ≤ -2 V

Logic

0 (SPACE)

1 (MARK)

Voltage between V (A) and V (B) is the voltage of (A) terminal for the

(B) terminal.

IMR01K02-E1

2. SPECIFICATIONS

Interface:

Connection method:

Communication speed:

Data bit configuration:

Based on RS-485, EIA standard

2-wire system, half-duplex multi-drop connection

Communication distance: 1 km max.

The maximum communication distance will be affected by the surrounding conditions.

Synchronous method: Start/stop synchronous type

2400 bps, 4800 bps, 9600 bps, 19200 bps

Data bit: 8 (Byte data corresponding to binary data or bit.)

Parity bit: Without, Odd or Even

Stop bit: 1

Protocol: Modbus

Signal transmission mode: Remote Terminal Unit (RTU) mode

Function code:

Error check method:

Error code:

03H (Read holding registers)

06H (Preset single register)

08H (Diagnostics: loopback test)

CRC-16

Termination resistor:

1: Function code error

2: When written to read only (RO) data, When any address other than

0000H to 001AH is specified, etc.

3: When the data written exceeds the setting range, When the specified number of data items in the query message exceeds the maximum number of data items available

4: Self-diagnostic error response

Externally connected

Maximum connections:

Signal logic:

32 instruments maximum including a master

RS-485

Signal voltage

V (A) - V (B) ≥ 2 V

V (A) - V (B) ≤ -2 V

Logic

0 (SPACE)

1 (MARK)

Voltage between V (A) and V (B) is the voltage of (A) terminal for the

(B) terminal.

IMR01K02-E1

3

4

3. WIRING

!

WARNING

To prevent electric shock or instrument failure, do not turn on the power until all the wiring is completed.

Terminal

No.

10

11

12

Signal name

Signal ground

Send data/Receive data

Send data/Receive data

Symbol

SG

T/R (A)

T/R (B)

SA201

(Slave)

SG

T/R (A)

T/R (B)

Communication terminal

$

$

$

SA201

(Slave)

SG

RS-485

Shielded twisted pair wire

Paired wire

Host computer (Master)

SG

T/R (A)

SD (TXD) ： Send data

T/R (B)

* R

Send/Receive transfer signal

SD (TXD) and RD (RXD): Negative logic

T/R (A)

T/R (B)

Communication terminal

31 max.

* R

* R: Termination resistors (Example: 120 Ω 1/2

RD (RXD) ： Receive data

IMR01K02-E1

3. WIRING

A RS-232C/RS-485 converter is required.

Paired wire

SA201

(Slave)

RS-485

SG

T/R (A)

T/R (B)

Communication connector

* R

SG

* R

T/R (A)

T/R (B)

Shielded twisted pair wire


RS-232C

Host computer

(Master)

* R: Termination resistors (Example: 120 Ω 1/2

When the host computer (master) uses Windows 95/98/NT , use a RS-232C/RS-485 converter with an automatic send/receive transfer function.

Recommended: CD485 , CD485/V manufactured by Data Link, Inc. or equivalent.

The cable is provided by the customer.

Device address

(Slave address)


RS-485

1 2 or

SA201

(Slave)

3 4


RS-232C


RS-485

Junction terminal

29 30

SA201

(Slave)

31

IMR01K02-E1

5

6

4. SETTING

To establish communication parameters between host computer (master) and SA201 (slave), it is necessary to set the device address (slave address), communication speed, data bit configuration and interval time on each SA201 (slave) in the communication mode.

Power ON

Input Type/Input Range Display (Display for approx. 4 seconds)

Display changes automatically

PV/SV Display Mode

Press and hold the

SET key and press the <R/S key at the same time

Communication Setting Mode

(Setting the communication parameters)

If the key is not pressed for more than one minute, the display will automatically return to the PV/SV display mode.

Power is turned on again

(Registration of set value)

4.1 Transfer to Communication Setting Mode

To go to the communication setting mode, you must be in PV/SV display. Press and hold the SET key and press the <R/S key at the same time to initiate communication settings. The first parameter to be displayed will be the device address (slave address), Add .

PV SV PV SV

SET

SA201

R/S

PV/SV display

AT

OUT1

OUT2

SV2

ALM1

ALM2

AT

OUT1

OUT2

SV2

ALM1

ALM2

SET

SA201

R/S

Device address (Slave address)

Communication setting mode

When let communication setting mode finish, press and hold the SET key and press the

<R/S key at the same time. The display changes to the PV/SV display.

IMR01K02-E1

3. WIRING

4.2 Setting the Communication Parameters

To select parameters in communication setting mode, press the SET key. The parameters are displayed and sequenced in the order of device address (slave address), Add , communication speed, bPS , data bit configuration, bIT and interval time set value, InT .

Setting procedure vary depending on the communication parameter.

• Device address Add , interval time InT

Operate UP, DOWN and <R/S key, and input numerals.

• Communication speed bPS , data bit configuration bIT

Operate UP, DOWN and <R/S key, and choose one among the displayed set value.

PV

PV

PV

Press the SET key.

PV

SV

Device address

(Slave address)

[ Add ]

Press the SET key.

SV

Communication speed

[ bPS ]

Press the SET key.

SV

Data configuration

[ bIT ]

Press the SET key.

SV

Interval time set value

[ InT ]

After completing all communication parameter settings, turn on the power again, and register the set value which changed.

IMR01K02-E1

7

3. WIRING

8

Symbol

(Add)

(bPS)

(bIT)

(InT)

Data bit configuration table

Set value Data bit

(7n1)

(7n2)

(7E1)

(7E2)

(7o1)

(7o2)

(8n1)

(8n2)

(8E1)

(8E2)

(8o1)

(8o2)

8

8

7

7

7

7

7

7

8

8

8

8

Name

Device address

(Slave address)

Communication speed

Data bit configuration

Interval time *

Setting range Description

0 to 99

240: 2400 bps

480: 4800 bps

960: 9600 bps

1920: 19200 bps

See data bit configuration table

0 to 250 ms

Please set it not to duplication in multi-drop connection.

If the slave address is set to 0 in Modbus, two-way communication cannot be performed.

Set the same communication speed for both the SA201

(slave) and the host computer

(master).

Set the same data bit configuration for both the

SA201 (slave) and the host computer (master).

The SA201’s interval time must match the specifications of the host computer.

Factory set value

0

960

8n1

10

Parity bit

Without

Without

Even

Even

Odd

Odd

Without

Without

Even

Even

Odd

Odd

Stop bit

1

2

1

2

1

2

1

2

1

2

1

2

Setting range of

Modbus

Setting range of

RKC communication

* The interval time for the SA201 should be set to provide a time for host computer to finish sending all data including stop bit and to switch the line to receive data. If the interval time between the two is too short, the SA201 may send data before the host computer is ready to receive it. In this case, communication transmission can not be conducted correctly. For a successful communication sequence to occur, the SA201’s interval time must match the specifications of the host computer.

IMR01K02-E1

3. WIRING

1. Go to the communication setting mode so that device address (slave address), Add , is displayed.

Present set value is displayed, and the least significant digit blinks.

PV SV

AT

OUT1

OUT2

SV2

ALM1

ALM2

SET

SA201

R/S

Device address (Slave address)

2. Set the device address. Press the UP key to enter 5 at the least significant digit.

Example: Setting the device address (slave address) to 15.

PV SV

AT

OUT1

OUT2

SV2

ALM1

ALM2

SET

SA201

R/S

3. Press the <R/S key to blink the tens digit.

PV SV

AT

OUT1

OUT2

SV2

ALM1

ALM2

SET

SA201

R/S

IMR01K02-E1

Continued on the next page.

9

3. WIRING

4. Press the UP key to enter 1 at the tens digit.

PV SV

AT

OUT1

OUT2

SV2

ALM1

ALM2

SET

SA201

R/S

5. Press the SET key to set the value thus set. The display changes to the next communication parameter. It the SET key is not pressed within 1 minute, the present display returns to the

PV/SV display mode and the value set here returns to that before the setting is changed.

PV SV

AT

OUT1

OUT2

SV2

ALM1

ALM2

SET

SA201

R/S

Communication speed

6. After completing all communication parameter settings, turn on the power again, and register the set value which changed.

Besides power on again, register of set value with RUN/ STOP transfer. In this case, have to change to STOP before setting communication parameter. Change to RUN after completing the communication parameter settings, the instrument performs the same operation as that at the time of power on again.

For the RUN/STOP transfer, see the SA201 Instruction Manual (IMR01K01-E % ) .

10

IMR01K02-E1

3. WIRING

4.3 Communication Requirements

The SA201 requires the following processing times during data send/receive.

Whether the host computer is using either the polling or selecting procedure for communication, the following processing times are required for SA201 to send data:

-Response wait time after SA201 sends BCC in polling procedure

-Response wait time after SA201 sends ACK or NAK in selecting procedure

RKC communication (Polling procedure)

Procedure details

Response send time after SA201 receives ENQ

Response send time after SA201 receives ACK

Response send time after SA201 receives NAK

Response send time after SA201 sends BCC

MIN

1.6

1.6

1.6

−

Time (ms)

TYP

4.0

−

−

−

MAX

12

10

10

1.0

RKC communication (Selecting procedure)


Response send time after SA201 receives BCC

Response wait time after SA201 sends ACK

Response wait time after SA201 sends NAK

Modbus


Read holding registers [03H]

Response transmission time after the slave receives the query message

Preset single register [06H]


Diagnostics (loopback test) [08H]


MIN

1.6

−

−

Time (ms)

TYP

3.0

−

−

Time (ms)

13 ms max.

6 ms max.

6 ms max.

MAX

10

1.0

1.0

Response send time is time at having set interval time in 0 ms.

IMR01K02-E1

11

3. WIRING

The sending and receiving of RS-485 communication is conducted through two wires; consequently, the transmission and reception of data requires precise timing. Typical polling and selecting procedures between the host computer and SA201 are described below:

Send data

(Possible/Impossible)

Possible

Impossible

Host computer

Sending status

E

O

T

- - - - -

E

N

Q

Send data


Possible

Impossible a

Controller

Sending status

S

T

X a : Response send time after SA201 receives [ENQ] + Interval time b : Response send time after SA201 sends BCC c : Response send time after SA201 receives [ACK] + Interval time or

Response send time after SA201 receives [NAK] + Interval time

- - - - -

B

C

C b

A

C

K or

N

A

K c

Send data


Possible

Impossible

Host computer

Sending status

S

T

X

- - - - -

B

C

C

Send data


Possible

Impossible a b

Controller

Sending status

A

C

K or

N

A

K a: Response send time after SA201 receives BCC + Interval time b: Response wait time after SA201 sends ACK or Response wait time after SA201 sends NAK

To switch the host computer from transmission to reception, send data must be on line. To check if data is on line, do not use the host computer’s transmission buffer but confirm it by the shift register.

Whether the host computer is using either the polling or selecting procedure for communication, the following processing times are required for SA201 to send data:

-Response wait time after SA201 sends BCC in polling procedure

-Response wait time after SA201 sends ACK or NAK in selecting procedure

12

A transmission error may occur with the transmission line disconnected, shorted or set to the highimpedance state. In order to prevent the above error, it is recommended that the fail-safe function be provided on the receiver side of the host computer. The fail-safe function can prevent a framing error from its occurrence by making the receiver output stable to the MARK (1) when the transmission line is in the high-impedance state.

IMR01K02-E1

5. RKC COMMUNICATION PROTOCOL

SA201 (hereafter, called controller) uses the polling/selecting method to establish a data link. The basic procedure is followed ANSI X3.28 subcategory 2.5, A4 basic mode data transmission control procedure (Fast selecting is the selecting method used in this controller).

controls the entire process. The host computer initiates all communication so the controller responds according to queries and commands from the host.

The transmission control characters are EOT (04H), ENQ (05H), ACK (06H), NAK (15H), STX

(02H) and ETX (03H). The figures in the parenthesis indicate the corresponding hexadecimal number.

5.1 Polling

Polling is the action where the host computer requests one of the connected controllers to transmit data. An example of the polling procedure is shown below:

E

O

T

(1)

Host computer send

[Address] [ ID ]

E

N

Q

(2)

Controller send

No response

(5)

S

T

X

E

O

T (4)

[ ID ] [ Data ]

E

T

X

[ BCC ]

(3)

Host computer send

Controller send

No

(8) response

(9)

Indefinite

A

C

(6)

K N

A

(7) K

Time out

E

O

T

Host computer send

E

O

T

(10)

ID: Identifier

IMR01K02-E1

13

5. RKC COMMUNICATION PROTOCOL

5.1.1 Polling procedures

(1) Data link initialization

Host computer sends EOT to the controllers to initiate data link before polling sequence.

(2) Data sent from host computer - Polling sequence

Host computer sends polling sequence with the format shown below:

1.

2.

3.

Example:

ENQ 0 2 M 1 ENQ

Device address

Identifier

1. Device address (2 digits)

The device address specifies the controller to be polled and each controller must have its own unique device address.

For details, see 4.2 Setting the Communication Parameters (P. 7) .

2. Identifier (2 digits)

The identifier specifies the type of data that is requested from the controller.

For details, see 5.3 Communication Identifier List (P. 22) .

3. ENQ

The ENQ is the transmission control character that indicates the end of the polling sequence. The

ENQ must be attached to the end of the identifier. The host computer then must wait for a response from the controller.

(3) Data sent from the controller

If the polling sequence is received correctly, the controller sends data in the following format:

1.

2.

STX Identifier

3.

Data

4.

ETX

5.

BCC

14

IMR01K02-E1


1. STX

STX is the transmission control character which indicates the start of the text transmission

(identifier and data).

2. Identifier (2 digits) For details, see 5.3 Communication Identifier List (P. 22) .

The identifier indicates the type of data (measured value, status and set value) sent to the host computer.

3. Data (6 digits [Expect model code.] )

Data is the information being sent from the controller. It is expressed in decimal ASCII code including a minus sign (-) and a decimal point. No zero suppression is made.

4. ETX

ETX is a transmission control character used to indicate the end of text transmission.

5. BCC

BCC (Block Check Character) detects error using horizontal parity and is calculated by horizontal parity (even number).

Calculation method of BCC: Exclusive OR all data and characters from STX through ETX, not including STX.

Example:

STX M 1 0 0 0 5 0 0 ETX

4DH 31H 30H 30H 30H 35H 30H 30H 03H

BCC

Hexadecimal numbers

BCC = 4DH ⊕ 31H ⊕ 30H ⊕ 30H ⊕ 30H ⊕ 35H ⊕ 30H ⊕ 30H ⊕ 03H = 7AH

Value of BCC becomes 7AH.

(4) EOT sent from the controller (Ending data transmission from the controller)

In the following cases, the controller sends EOT to terminate the data link:

• When the specified identifier is invalid

• When there is an error in the data type

• When all the data has been sent

(5) No response from the controller

The controller will not respond if the polling address is not received correctly. It may be necessary for the host computer to take corrective action such as a time-out.

IMR01K02-E1 15


(6) ACK Acknowledgment

An acknowledgment ACK is sent by the host computer when data received is correct. When the controller receives ACK from the host computer, the controller will send any remaining data of the next identifier without additional action from the host computer.

For the identifier, see 5.3 Communication Identifier List (P. 22) .

When host computer determines to terminate the data link, EOT is sent from the host computer.

(7) NAK Negative acknowledge

If the host computer does not receive correct data from the controller, it sends a negative acknowledgment NAK to the controller. The controller will re-send the same data when NAK is received. This cycle will go on continuously until either recovery is achieved or the data link is corrected at the host computer.

(8) No response from host computer

When the host computer does not respond within approximately three seconds after the controller sends data, the controller sends EOT to terminate the data link.

(9) Indefinite response from host computer

The controller sends EOT to terminate the data link when the host computer response is indefinite.

(10) EOT Data link termination

The host computer sends EOT message when it is necessary to suspend communication with the controller or to terminate the data link due lack of response from the controller.

16

IMR01K02-E1


5.1.2 Polling procedure example

Host computer send

E

O

T

0 1 M 1

E

N

Q

Polling address

Identifier

Host computer send

A

C

K

S

T

X

M 1 0 0 1 0 .

0

E

T

X

B

C

C

S

T

X

A A 0 0 0 0 0 0

E

T

X

Host computer send

B

C

C

E

O

T

Identifier Data

Send data

Controller send

Next send data

Controller send

Host computer send

E

O

T

0 1 M 1

E

N

Q

Polling address

Identifier

Error data

S

T

X

M 1 0 0 1

Host computer send

N

A

K

.

0

E

T

X

B

C

C

S

T

X

M 1 0 0 1 0 .

0

Host computer send

E

T

X

B

C

C

A

C

K

Identifier Data

Send data

Controller send

Re-send data

Controller send

IMR01K02-E1 17


5.2 Selecting

Selecting is the action where the host computer requests one of the connected controllers to receive data. An example of the selecting procedure is shown below:

E

O

T

(1)

[Address]

(2)

Host computer send

S

T

X

[ Identifier ] [ Data ]

E

T

X

[ BCC ]

(3)

Controller send

No response

(6)

A

C

K (4)

Host computer send

E

O

T

(7)

N

A

K (5)

5.2.1 Selecting procedures

(1) Data link initialization

Host computer sends EOT to the controllers to initiate data link before selecting sequence.

(2) Sending selecting address from the host computer

Host computer sends selecting address for the selecting sequence.

Device address (2 digits)

The device address specifies the controller to be selected and each controller must have its own unique device address.


18

IMR01K02-E1


(3) Data sent from the host computer

The host computer sends data for the selecting sequence with the following format:

1.

STX Identifier

2.

Data ETX BCC

For the STX, ETX and BCC, see 5.1 Polling (P. 13) .

1. Identifier (2 digits)

The identifier specifies the type of data that is requested from the controller, such as set value.

For details, see 5.3 Communication Identifier List (P. 22) .

2. Data (Maximum 6 digits)

Data is the information being sent to the controller. It is expressed in decimal ASCII code including a minus sign (-) and a decimal point (period).

The data that receipt of letter is possible

• Data with numbers below the decimal point omitted or zero suppressed data can be received.

<Example> When data send with -001.5, -01.5, -1.5, -1.50, -1.500 at the time of -1.5, controller can receive a data.

• When the host computer send data with decimal point to item of without decimal point, controller receives a message with the value which cut off below the decimal point.

<Example> When setting range is 0 to 200, controller receives as a following.

Send data

Receive data

0.5

0

100.5

100

• Controller receives value in accordance with decided place after the decimal point. The value below the decided place after the decimal point is cut off.

<Example> When setting range is -10.00 to +10.00, controller receives as a following.

Send data

Receive data

-.5

-0.50

-.058

-0.05

.05

0.05

-0

0.00

The data that receipt of letter is impossible

Controller sends NAK when received a following data.

.

-.

+

-

Plus sign and the data that gained plus sing

Only minus sign (there is no figure)

Only decimal point (period)

Only minus sign and decimal point (period)

IMR01K02-E1 19


(4) ACK Acknowledgment

An acknowledgment ACK is sent by the controller when data received is correct. When the host computer receives ACK from the controller, the host computer will send any remaining data. If there is no more data to be sent to controller, the host computer sends EOT to terminate the data link.

(5) Negative acknowledge NAK

If the controller does not receive correct data from the host computer, it sends a negative acknowledgment NAK to the host computer. Corrections, such as re-send, must be made at the host computer. The controller will send NAK in the following cases:

• When an error occurs on communication the line (parity, framing error, etc.)

• When a BCC check error occurs

• When the specified identifier is invalid

• When receive data exceeds the setting range

(6) No response from controller

The controller does not respond when it can not receive the selecting address, STX, ETX or BCC.

(7) EOT Data link termination

The host computer sends EOT when there is no more data to be sent from the host computer or there is no response from the controller.

20

IMR01K02-E1


5.2.2 Selecting procedure example

E

O

T

0 1

S

T

X

Host computer send

S 1 2 0 0 .

0

E

T

X

B

C

C

Selecting address

Identifier Data

Send data

A

C

K

Controller send

S

T

X

Host computer send

P 1 1 .

0

E

T

X

B

C

C

Host computer send

E

O

T

Next send data

A

C

K

Controller send

E

O

T

0 1

S

T

X

Error data

Host computer send

S 1 2 1 0 .

0

E

T

X

B

C

C

Selecting address

Identifier Data

Send data

N

A

K

Controller send

S

T

X

Host computer send

S 1 2 0 0 .

0

E

T

X

B

C

C

Re-send data

A

C

K

Controller send

Host computer send

S

T

X

P 1

……

IMR01K02-E1 21


5.3 Communication Identifier List

Communication is not possible when an identifier is specified that the controller can not recognize.

The number of digits for data is 6.

Name Identifier

(Attribute

Description

RO: Read only, R/W: Read and Write)

Model code ID Display the model code

Measured value (PV) M1 Within input range.

Burnout B1 0: OFF 1: ON

Alarm 1 status

Alarm 2 status

AA 0: OFF

AB 0: OFF

O1 -5.0 to +105.0 %

1: ON

1: ON

Heat-side manipulated output value

Cool-side manipulated output value

Error code 1

O2 -5.0 to +105.0 %

RUN/STOP function

ER 0: No error

Except 0: Error occurs

SR 0: RUN 1: STOP

Autotuning

Self-tuning

Set value (SV)

G1 0: Autotuning OFF

1: Autotuning ON

After autotuning is completed, setting will automatically change to 0 .

G2 0: Self-tuning OFF

1: Self-tuning ON

S1 Within input range.


-----

-----

-----

-----

-----

-----

-----

-----

0

0

0

Temperature input: 0 or 0.0

Voltage/current inputs: 0.0

Attribute

RO

RO

R/W

R/W

R/W

R/W

2

RO

RO

RO

RO

RO

RO

22

1

2

Any number other than 0 indicates errors (RAM write error, etc.) detected by the controller selfdiagnosis function. Please contact RKC sales office or the agent.

If the heat/cool PID control with autotuning (water cooling/air cooling) is selected, or the set value of any one of the heat/cool proportional band, integral time, derivative time and anti-reset windup is set to 0, the attribute becomes RO.


IMR01K02-E1


Continued from the previous page.

Name

Alarm 1 set value

Identifier

(Attribute

Description



Attribute

R/W 1 A1 Process alarm, SV alarm:

Setting limiter (low limit) to setting limiter (high limit)

Temperature input:

50 or 50.0

R/W 2 Alarm 2 set value

Control loop break alarm

Control loop break alarm deadband

Heat-side proportional band

Integral time

A2 Deviation alarm: -span to +span

However, within -1999 to +9999 ° C

[ ° F] or -199.9 to +999.9 ° C [ ° F]

A5 0.0 to 200.0 minutes

(0.0: OFF)

A6 0 (0.0) to span

However, less than 9999

P1 Temperature input:

0 (0.0) to span or 9999 (999.9) ° C [ ° F]

(0 or 0.0: ON/OFF action)

Voltage/current inputs: 0.1 to span

Cannot be written while the self-tuning function is on, only Read is available.

I1 0 to 3600 seconds (0: PD action)



8.0

0

Temperature input:

30 or 30.0


240

Derivative time

Anti-reset windup

D1 0 to 3600 seconds (0: PI action)


W1 0 to 100 % of heat-side proportional band (0: Integral action OFF)


60

100

Heat-side proportioning cycle time

T0 1 to 100 seconds Note1

1

2

If no alarm for first alarm or control loop break alarm is selected, the attribute becomes RO.

If no alarm for second alarm is selected, the attribute becomes RO.

3 If control loop break alarm for first alarm is not selected, the attribute becomes RO.

Note1 Relay contact output: 20 Voltage pulse output: 2

R/W

R/W

R/W

R/W

R/W

R/W

R/W

3

3


IMR01K02-E1 23


24


Name

Cool-side proportional band

Overlap/deadband

Cool-side proportioning cycle time

PV bias

Identifier

P2 1 to 1000 band

%

(Attribute

Description


of heat-side proportional


100

Attribute

R/W 1

0 or 0.0

R/W 1 V1 -span to +span


[ ° F] or -199.9 to +999.9 ° C [ ° F]

T1 1 to 100 seconds Note1 R/W 1

R/W

Digital filter

Set data lock function 2

PB -span to +span


[ ° F] or -199.9 to +999.9 ° C [ ° F]

F1

LK

0 to 100 seconds (0: OFF)

0000 to 1111



0

0000

R/W

R/W

1 If heat/cool PID control with autotuning (water cooling/air cooling) for control type is not selected, the attribute becomes RO.

2 Details of set data lock function:

Set data Set value (SV)

Alarm setting

(First alarm, Second alarm)

Other setting items

0000

0001

0010

0011

0100

0101

0110

1111

−

−

−

−

×

×

×

×

×

×

−

−

×

×

−

−

×

−

×

−

×

−

×

−

( × ) Settable-Data unlocked (-) Unsettable-Data locked

The data lock function only prevents setting changes being made from the front keys. Setting changes can still be made through communication transmission.



IMR01K02-E1



EEPROM storage mode 1

EEPROM storage status 2

Name Identifier

(Attribute

Description



0

Attribute

R/W EB 0: Backup mode

(Set values are store to the EEPROM)

1: Buffer mode

(No set values are store to the EEPROM)

EM 0: Mismatch

1: Match

----RO

1 The non-volatile memory (EEPROM) has limitations on the number of memory rewrite times. If the buffer mode is selected as an EEPROM storage mode, all of the set values changed are not written to the EEPROM and thus a problem of limitations on the number of memory rewrite times can be solved. When the memory is used to frequently change the set value via communication, select the buffer mode.

When selecting any EEPROM storage mode, take notice of the following.

• If power failure occurs while the buffer mode is selected, the set value returns to the value before the storage mode is selected.

• If the buffer mode is changed to the backup mode, all of the set values at that time are stored to the EEPROM. If necessary to backup the final value of each set item, select the backup mode.

• When the power is turned on, the backup mode is always set.

2 The contents of the buffer memory and those of the EEPROM can be checked.

When data is 0 : The contents of the buffer memory do not match with those of the EEPROM.

• As data is being written to the EEPROM in backup mode, do not turn the power off. If turned off, no set values are stored.

• If the set value is changed after the backup mode is changed to the buffer mode,

0 is set (mismatch). As the set value changed is not backup, select the backup mode if necessary.

When data is 1 : The contents of the buffer memory match with those of the EEPROM.

(Data write to the EEPROM is completed.)

IMR01K02-E1 25

26

6. MODBUS COMMUNICATION PROTOCOL

The master controls communication between master and slave. A typical message consists of a request (query message) sent from the master followed by an answer (response message) from the slave. When master begins data transmission, a set of data is sent to the slave in a fixed sequence.

When it is received, the slave decodes it, takes the necessary action, and returns data to the master.

6.1 Message Format

The message consists of four parts: slave address, function code, data, and error check code which are always transmitted in the same sequence.

Slave address

Function code

Data

Error check CRC-16

Message format

The slave address is a number from 1 to 99 manually set at the front key panel of the controller.


Although all connected slaves receive the query message sent from the master, only the slave with the slave address coinciding with the query message will accept the message.

The function codes are the instructions set at the master and sent to the slave describing the action to be executed. The function codes are included when the slave responds to the master.

For details, see 6.2 Function Code (P. 27) .

The data to execute the function specified by the function code is sent to the slave and corresponding data returned to the master from the slave.

For details, see 6.6 Message Format (P. 31) , 6.7 Data Configuration (P. 34) and

6.8 Communication Data List (P. 36) .

An error checking code (CRC-16: Cyclic Redundancy Check) is used to detect an error in the signal transmission.

For the calculation method of CRC-16, see 6.5 Calculating CRC-16 (P. 29) .

IMR01K02-E1

6. MODBUS COMMUNICATION PROTOCOL

6.2 Function Code

Function code contents

Function code

(Hexadecimal)

03H

06H

08H

Function Contents

Read holding registers

Preset single register

Measured value (PV), alarm status, etc.

Set value (SV), alarm set value, PID constants,

PV bias, etc. (For each word)

Diagnostics (loopback test) Diagnostics (loopback test)

Message length of each function (Unit: byte)

Function code

(Hexadecimal)

03H

06H

08H

Function

Read holding registers

Preset single register

Diagnostics (loopback test)

Query message Response message

Min Max Min Max

8

8

8

8

8

8

7

8

8

255

8

8

6.3 Communication Mode

Signal transmission between the master and slaves is conducted in Remote Terminal Unit (RTU) mode.

RTU mode

Items

Data bit length

Start mark of message

End mark of message

Message length

Data time interval

Error check

Contents

8 bit (Binary)

Unused

Unused

See 6.2 Function Code (P. 27)

24 bit’s time or less *

CRC-16 (Cyclic Redundancy Check)

* The data time intervals in one query message from the master must be 24 bit’s time or less. If the data time interval exceeds 24 bit’s time, the slave regards the transmission as ended and because the message format is incomplete, the slave does not respond.

IMR01K02-E1

27


28

6.4 Slave Responses

(1) Normal response

• In the response message of the Read Holding Registers, the slave returns the read out data and the number of data items with the same slave address and function code as the query message.

• In the response message of the Preset Single Resister, the slave returns the same message as the query message.

• In the response message of the Diagnostics (loopback test), the slave returns the same message as the query message.

(2) Defective message response

• If the query message from the master is defective, except for transmission error, the slave returns the error response message without any action.

Slave address

Function code

Error code

Error check CRC-16

Error response message

• If the self-diagnostic function of the slave detects an error, the slave will return an error response message to all query messages.

• The function code of each error response message is obtained by adding 80H to the function code of the query message.

Error code

1

2

3

4

Contents

Function code error (Specifying nonexistent function code)

When written to read only (RO) data, When any address other than 0000H to

001AH is specified, etc.

When the data written exceeds the setting range, When the specified number of data items in the query message exceeds the maximum number of data items available

Self-diagnostic error response

(3) No response

The slave ignores the query message and does not respond when:

• The slave address in the query message does not coincide with any slave address settings.

• The CRC code of the master does not coincide with that of the slave.

• Transmission error such as overrun, framing, parity and etc., is found in the query message.

• Data time interval in the query message from the master exceeds 24 bit’s time.

IMR01K02-E1


6.5 Calculating CRC-16

The Cyclic Redundancy Check (CRC) is a 2 byte (16-bit) error check code. After constructing the data message, not including start, stop, or parity bit, the master calculates a CRC code and appends this to the end of the message. The slave will calculate a CRC code from the received message, and compare it with the CRC code from the master. If they do not coincide, a communication error has occurred and the slave does not respond.

The CRC code is formed in the following sequence:

1. Load a 16-bit CRC register with FFFFH.

2. Exclusive OR ( ⊕ ) the first byte (8 bits) of the message with the CRC register. Return the result to the CRC register.

3. Shift the CRC register 1 bit to the right.

4. If the carry flag is 1 , exclusive OR the CRC register with A001 hex and return the result to the

CRC register. If the carry flag is 0 , repeat step 3 .

5. Repeat step 3 and 4 until there have been 8 shifts.

6. Exclusive OR the next byte (8 bits) of the message with the CRC register.

7. Repeat step 3 through 6 for all bytes of the message (except the CRC).

8. The CRC register contains the 2 byte CRC error code. When they are appended to the message, the low-order byte is appended first, followed by the high-order byte.

IMR01K02-E1 29


30

START

FFFFH → CRC Register

CRC Register ⊕ next byte of the message → CRC Register

0 → n

Shift CRC Register right 1 bit

No

Carry flag is 1

Yes

CRC Register ⊕ A001H → CRC Register n + 1 → n

No

No n > 7

Yes

Is message complete ?

Yes

END

The ⊕ symbol indicates an exclusive OR operation. The symbol for the number of data bits is n .

IMR01K02-E1


6.6 Message Format

6.6.1 Read holding registers [03H]

The query message specifies the starting register address and quantity of registers to be read.

The contents of the holding registers are entered in the response message as data, divided into two parts: the high-order 8 bits and the low-order 8 bits, arranged in the order of the register numbers.

Example: The contents of the three holding registers from 0000H to 0002H are the read out from slave address 2.

Query message

Slave address

Function code

Starting number

Quantity

CRC-16

High

Low

High

Low

High

Low

02H

03H

00H

00H

00H

03H

05H

F8H

First holding register address

The setting must be between 1 and 125

(0001H and 007DH).

Normal response message

Slave address

Function code

Number of data

First holding register contents

Next holding register contents

Next holding register contents

CRC-16

High

Low

High

Low

High

Low

High

Low

Error response message

Slave address

80H + Function code

Error code

CRC-16 High

Low

02H

03H

06H

00H

00H

00H

00H

00H

63H

75H

ACH

02H

83H

03H

F1H

31H

Number of holding registers × 2

IMR01K02-E1 31


6.6.2 Preset single register [06H]

The query message specifies data to be written into the designated holding register. The write data is arranged in the query message with high-order 8 bits first and low-order 8 bits next. Only R/W holding registers can be specified.

Example: Data is written into the holding register 0006H of slave address 1.

Query message

Slave address

Function code

Holding register number

Write data

CRC-16

High

Low

High

Low

High

Low

01H

06H

00H

10H

01H

02H

08H

5EH

Any data within the range


Slave address

Function code

Holding register number

Write data

CRC-16

High

Low

High

Low

High

Low


Slave address

80H + Function code

Error code

CRC-16 High

Low

01H

06H

00H

10H

01H

02H

08H

5EH

01H

86H

02H

CDH

C1H

Contents will be the same as query message data.

32

IMR01K02-E1


6.6.3 Diagnostics (loopback test) [08H]

The master’s query message will be returned as the response message from the slave. This function checks the communication system between the master and slave.

Example: Loopback test for slave address 1

Query message

Slave address

Function code

Test code

Data

CRC-16

High

Low

High

Low

High

Low

01H

08H

00H

00H

1FH

34H

E9H

ECH

Test code must be set to 00 .

Any pertinent data


Slave address

Function code

Test code

Data

CRC-16

High

Low

High

Low

High

Low


Slave address

80H + Function code

Error code

CRC-16 High

Low

01H

08H

00H

00H

1FH

34H

E9H

ECH

01H

88H

03H

06H

01H

Contents will be the same as query message data.

IMR01K02-E1 33


6.7 Data Configuration

6.7.1 Data range

The numeric range of data used in Modbus protocol is 0000H to FFFFH. Only the set value within the setting range is effective.

FFFFH represents -1.

Data processing with decimal points

The Modbus protocol does not recognize data with decimal points during communication.


Example: When the control loop break alarm set value is 8.0 minutes; 8.0 is processed as 80,

80 = 0050H


High

Low

00H

50H

Alarm 1 status

Alarm 2 status

Burnout

Autotuning

Self-tuning

Integral time

Derivative time

Anti-reset windup



Cool-side proportional cycle time

Set data lock function

RUN/STOP function

Example: When integral time is 50 seconds; 50 is processed as 50, 50 = 0032H

Integral time High

Low

00H

32H

34

IMR01K02-E1


The position of the decimal point changes depending on the input range type because the Modbus protocol does not recognize data with decimal points during communication.

The following data can have one of three decimal point positions:

• No decimal point

• One decimal place

• Two decimal place

For details, see 7. INPUT RANGE TABLES (P. 40) .

Measured value (PV)

Set value (SV)

Alarm 1 set value

Alarm 2 set value



PV bias

Example: When the temperature set value is -20.0 ° C; -20.0 is processed as -200,

-200 = 0000H - 00C8H = FF38H

Set value (SV) High

Low

FFH

38H

6.7.2 Data processing precautions

• For 03H (read holding register), an error response message is returned when the start address is larger than 1AH.

• For 06H (preset single register), an error message is returned when the write address is larger than

1AH.

• Read data of unused channel and undefined address is 0 .

• Any attempt to write to an unused channel is not processed as an error. Data can not be written into an unused channel.

• If data range or address error occurs during data writing, the data written before error is in effect.

IMR01K02-E1 35


36

6.8 Communication Data List

The communication data list summarizes data addresses (holding resister numbers), names, descriptions, factory set values and attributes.

Address Name

(Attribute

Description



Attribute

00H

03H

04H

05H

06H

Measured value

(PV)

Alarm 1 status

Alarm 2 status

Burnout

Set value (SV)

Within input range.

0: OFF

0: OFF

0: OFF

1: ON

1: ON

1: ON

Within input range.

-----

-----

-----

-----


Voltage/current inputs: 0

RO

RO

RO

RO

R/W

07H

08H

0BH

0CH

Alarm 1 set value

Alarm 2 set value



Process alarm, SV alarm:

Setting limiter (low limit) to setting limiter (high limit)

Deviation alarm: -span to +span


[ ° F] or -199.9 to +999.9 ° C [ ° F]

0.0 to 200.0 minutes

(0.0: OFF)

0 (0.0) to span

However, less than 9999

Temperature input:

50 or 50.0


8.0

0

R/W

R/W

R/W

R/W

1

2

3

3

0DH Autotuning 0: Autotuning OFF

1: Autotuning ON

After autotuning is completed, setting will automatically change to 0 .

0 R/W

0EH Self-tuning 0: Self-tuning OFF

1: Self-tuning ON

0 R/W 4

1

2

3

4

If no alarm for first alarm or control loop break alarm is selected, the attribute becomes RO.

If no alarm for second alarm is selected, the attribute becomes RO.

If control loop break alarm for first alarm is not selected, the attribute becomes RO.

If the heat/cool PID control with autotuning (water cooling/air cooling) is selected, or the set value of any one of the heat/cool proportional band, integral time, derivative time and anti-reset windup is set to 0, the attribute becomes RO.


IMR01K02-E1



Address

0FH

Name


(Attribute

Description



Attribute

Temperature input:

0 (0.0) to span or 9999 (999.9) ° C [ ° F]

(0 or 0.0: ON/OFF action)

Voltage/current inputs: 0.1 to span


Temperature input:

30 or 30.0


R/W

10H

11H

12H

13H

14H

15H

16H

17H

Integral time 0 to 3600 seconds (0: PD action)


Deviation time 0 to 3600 seconds (0: PI action)


Anti-reset windup 0 to 100 % of heat-side proportional band (0: Integral action OFF)




1 to 100 seconds

1 to 1000 % of heat-side proportional band

Overlap/deadband -span to +span


[ ° F] or -199.9 to +999.9 ° C [ ° F]

1 to 100 seconds Cool-side proportioning cycle time

PV bias -span to +span


[ ° F] or -199.9 to +999.9 ° C [ ° F]

240

60

100

Note1

100

0 or 0.0

Note1



R/W

R/W

R/W

R/W

R/W *

R/W *

R/W *

R/W


* If heat/cool PID control with autotuning (water cooling/air cooling) for control type is not selected, the attribute becomes RO.


IMR01K02-E1 37



Address Name

(Attribute

Description



Attribute

0 R/W 18H

19H

1AH

Set data lock function *

RUN/STOP function

Digital filter

0 to 7

0: RUN 1: STOP

0 to 100 seconds (0: OFF)

0

0

R/W

R/W

* Details of set data lock function:

Set data Set value (SV)

Alarm setting

(First alarm, Second alarm)

Other setting items

0

1

2

3

4

5

6

7

−

−

−

−

×

×

×

×

×

×

−

−

×

×

−

−

×

−

×

−

×

−

×

−

( × ) Settable-Data unlocked (-) Unsettable-Data locked

The data lock function only prevents setting changes being made from the front keys. Setting changes can still be made through communication transmission.

38


IMR01K02-E1



Address

1BH

1CH

1DH

1EH

Name

EEPROM storage mode 1

EEPROM storage status 2

Heat-side manipulated output value

Cool-side manipulated output value

(Attribute

Description



Attribute

0: Backup mode

(Set values are store to the EEPROM)

1: Buffer mode

(No set values are store to the EEPROM)

0 R/W

0: Mismatch

1: Match

-5.0 to +105.0 %

-----

-----

RO

RO

-5.0 to +105.0 % ----RO

1 The non-volatile memory (EEPROM) has limitations on the number of memory rewrite times. If the buffer mode is selected as an EEPROM storage mode, all of the set values changed are not written to the EEPROM and thus a problem of limitations on the number of memory rewrite times can be solved. When the memory is used to frequently change the set value via communication, select the buffer mode.

When selecting any EEPROM storage mode, take notice of the following.

• If power failure occurs while the buffer mode is selected, the set value returns to the value before the storage mode is selected.

• If the buffer mode is changed to the backup mode, all of the set values at that time are stored to the EEPROM. If necessary to backup the final value of each set item, select the backup mode.

• When the power is turned on, the backup mode is always set.

2 The contents of the buffer memory and those of the EEPROM can be checked.

When data is 0 : The contents of the buffer memory do not match with those of the EEPROM.

• As data is being written to the EEPROM in backup mode, do not turn the power off. If turned off, no set values are stored.

• If the set value is changed after the backup mode is changed to the buffer mode,

0 is set (mismatch). As the set value changed is not backup, select the backup mode if necessary.

When data is 1 : The contents of the buffer memory match with those of the EEPROM.

(Data write to the EEPROM is completed.)

IMR01K02-E1 39

40

7. INPUT RANGE TABLES

Input Range Table 1

Input type

Thermocouple

K

J

Input range

0 to 200 ° C

0 to 400 ° C

0 to 600 ° C

0 to 800 ° C

0 to 1000 ° C

0 to 1200 ° C

0 to 1372 ° C

-199.9 to +300.0 ° C

0.0 to 400.0 ° C

0.0 to 800.0 ° C

0 to 100 ° C

0 to 300 ° C

0 to 450 ° C

0 to 500 ° C

0.0 to 200.0 ° C

0.0 to 600.0 ° C

-199.9 to +800.0 ° C

0 to 800 ° F

0 to 1600 ° F

0 to 2502 ° F

0.0 to 800.0 ° F

20 to 70 ° F

-199.9 to +999.9 ° F

0 to 200 ° C

0 to 400 ° C

0 to 600 ° C

0 to 800 ° C

0 to 1000 ° C

0 to 1200 ° C

-199.9 to +300.0 ° C

0.0 to 400.0 ° C

0.0 to 800.0 ° C

0 to 450 ° C

0.0 to 200.0 ° C

0.0 to 600.0 ° C

-199.9 to +600.0 ° C

Code

Input Range

J

J

K

K

K

K

K

K

J

J

J

J

J

J

J

J

J

J

J

K

K

K

K

K

K

K

K

K

K

K

K

K

K

K

K

K


A9

B2

01

02

A1

A2

A3

A4

08

09

10

22

03

04

05

06

07

23

30

17

20

29

37

38

08

09

10

13

14

01

02

03

04

05

06

07

IMR01K02-E1

7. INPUT RANGE TABLES


Input type Input range Code

Input Range

Thermocouple

J

R

S

B

E

N

0 to 800 ° F

0 to 1600 ° F

0 to 2192 ° F

0 to 400 ° F

0 to 300 ° F

-199.9 to +999.9 ° F

0.0 to 800.0 ° F

0 to 1600 ° C 1

0 to 1769 ° C 1

0 to 1350 ° C 1

0 to 3200 ° F 1

0 to 3216 ° F 1

0 to 1600 ° C 1

0 to 1769 ° C 1

0 to 3200 ° F 1

0 to 3216 ° F 1

400 to 1800 ° C

0 to 1820 ° C 1

800 to 3200 ° F

0 to 3308 ° F 1

0 to 800 ° C

0 to 1000 ° C

0 to 1600 ° F

0 to 1832 ° F

0 to 1200 ° C

0 to 1300 ° C

0.0 to 800 ° C

0 to 2300 ° F

0 to 2372 ° F

0.0 to 999.9 ° F

J

J

J

J

J

J

J

R

R

R

R

R

S

S

S

S

B

B

B

B

E

E

E

E

N

N

N

N

N

N

A1

A2

A3

A6

A7

A9

B6

01

02

04

A1

A2

01

02

A1

A2

01

02

A1

A2

01

02

A1

A2

01

02

06

A1

A2

A5

1

2

T

-199.9 to +400.0 ° C

-199.9 to +100.0 ° C

-100.0 to +200.0 ° C

0.0 to 350.0 ° C

2

2

2

-199.9 to +752.0 ° F

-100.0 to +200.0 ° F

-100.0 to +400.0 ° F

0.0 to 450.0 ° F

T

T

T

T

T

T

T

T

01

02

03

04

A1

A2

A3

A4

0.0 to 752.0 ° F

Accuracy is not guaranteed between 0 to 399 ° C (0 to 751 ° F)

T A5

Accuracy is not guaranteed between 199.9 to -100.0 ° C ( 199.9 to -148.0 ° F)


IMR01K02-E1

41


42


Input type Input range

Thermocouple

RTD

W5Re/W26Re

PL II

U

L

Pt100

0 to 2000 ° C

0 to 2320 ° C

0 to 4000 ° F

0 to 1300 ° C

0 to 1390 ° C

0 to 1200 ° C

0 to 2400 ° F

0 to 2534 ° F

-199.9 to +600.0 ° C *

-199.9 to +100.0 ° C *

0.0 to 400.0 ° C

-199.9 to +999.9 ° F *

-100.0 to +200.0 ° F

0.0 to 999.9 ° F

0 to 400 ° C

0 to 800 ° C

0 to 800 ° F

0 to 1600 ° F

-199.9 to +649.0 ° C

-199.9 to +200.0 ° C

-100.0 to +50.0 ° C

-100.0 to +100.0 ° C

-100.0 to +200.0 ° C

0.0 to 50.0 ° C

0.0 to 100.0 ° C

0.0 to 200.0 ° C

0.0 to 300.0 ° C

0.0 to 500.0 ° C

-199.9 to +999.9 ° F

-199.9 to +400.0 ° F

-199.9 to +200.0 ° F

-100.0 to +100.0 ° F

-100.0 to +300.0 ° F

0.0 to 100.0 ° F

0.0 to 200.0 ° F

0.0 to 400.0 ° F

0.0 to 500.0 ° F

* Accuracy is not guaranteed between 199.9 to -100.0 ° C ( 199.9 to -148.0 ° F)


Code

Input Range

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

D

L

L

L

L

A

A

A

A

U

W

W

W

A

U

U

U

U

U

A6

A7

A8

A9

06

07

08

09

10

01

02

03

04

05

A1

A2

A3

A4

A5

01

02

A1

A2

02

03

A1

A2

01

01

02

A1

01

02

03

A1

A2

A3

IMR01K02-E1



RTD

Input type

JPt100

Input range

-199.9 to +649.0 ° C

-199.9 to +200.0 ° C

-100.0 to +50.0 ° C

-100.0 to +100.0 ° C

-100.0 to +200.0 ° C

0.0 to 50.0 ° C

0.0 to 100.0 ° C

0.0 to 200.0 ° C

0.0 to 300.0 ° C

0.0 to 500.0 ° C

Code

Input Range

P

P

P

P

P

P

P

P

P

P

Input Range Table 2

Voltage

Current

Input type

0 to 5 V DC

0 to 10 V DC

1 to 5 V DC

0 to 20 mA DC

4 to 20 mA DC

Input range

0. 0 to 100.0 % 6

7

4

5

8

Code

Input Range

01

01

01

01

01

For the current input specification, a resistor of 250 Ω must be connected between the input terminals.

01

02

03

04

05

06

07

08

09

10

IMR01K02-E1

43

8. TROUBLESHOOTING

!

WARNING

power before replacing the instrument.

before mounting or removing the instrument.

all the wiring is completed.

instrument.

experience in this type of work.

44

CAUTION

All wiring must be completed before power is turned on to prevent electric shock, instrument failure, or incorrect action.

The power must be turned off before repairing work for input break and output failure including replacement of sensor, contactor or SSR, and all wiring must be completed before power is turned on again.

This section lists some of the main causes and solutions for communication problems.

If you can not solve a problem, please contact RKC sales office or the agent, on confirming the type name and specifications of the product.

Problem Probable cause

No response Wrong connection, no connection or disconnection of the communication cable

Breakage, wrong wiring, or imperfect contact of the communication cable

Mismatch of the setting data of communication speed and data bit configuration with those of the host

Wrong address setting

Solution

Confirm the connection method or condition and connect correctly

Confirm the wiring or connector and repair or replace the wrong one

Confirm the settings and set them correctly


IMR01K02-E1

8. TROUBLESHOOTING



No response Error in the data format

Solution

Reexamine the communication program

Transmission line is not set to the receive state after data send (for RS-485)

EOT return The specified identifier is invalid

Error in the data format

Confirm the identifier is correct or that with the correct function is specified.

Otherwise correct it

Reexamine the communication program

NAK return Error occurs on the line (parity bit error, framing error, etc.

Confirm the cause of error, and solve the problem appropriately. (Confirm the transmitting data, and resend data)

BCC error

The data exceeds the setting range

The specified identifier is invalid

Confirm the setting range and transmit correct data

Confirm the identifier is correct or that with the correct function is specified.

Otherwise correct it

IMR01K02-E1

45

8. TROUBLESHOOTING


No response Wrong connection , no connection or disconnection of the communication cable

Solution

Confirm the connection method or condition and connect correctly

Breakage, wrong wiring, or imperfect contact of the communication cable

Confirm the wiring or connector and repair or replace the wrong one

Error code

1

Error code

2

Error code

3

Error code

4

Mismatch of the setting data of communication speed and data bit configuration with those of the host

Confirm the settings and set them correctly

Wrong address setting

A transmission error (overrun error, framing error, parity error or CRC-16 error) is found in the query message

The time interval between adjacent data in the query message is too long, exceeding

24 bit’s time

Function cod error

(Specifying nonexistent function code)

When written to read only (RO) data,

When any address other than 0000H to

001AH is specified, etc.

When the data written exceeds the setting range, When the specified number of data items in the query message exceeds the maximum number of data items available

Self-diagnostic error

Re-transmit after time-out occurs or verify communication program

Confirm the function code

Confirm the address of holding register

Confirm the setting data

Turn off the power to the instrument. If the same error occurs when the power is turned back on, please contact RKC sales office or the agent.

46

IMR01K02-E1

9. ASCII 7-BIT CODE TABLE (REFERENCE)

This table is only for use with RKC communication.

b7 0 b6 0 b5 0

0

0

0

1

1 b5 to b7 b4 b3 b2 b1

0 0 0 0 0 NUL DLE SP

0 0 0 1 1 SOH DC1 !

0 0 1 0 2 STX DC2

0 0 1 1 3 ETX DC3

”

#

0 1 0 0 4 EOT DC4 $

0 1 0 1 5 ENQ NAK %

0 1 1 0 6 ACK SYM &

0 1 1 1 7 BEL ETB ’

1 0 0 0 8 BS CAN (

1 0 0 1 9 HT EM

1 0 1 0 A LF SUB

1 0 1 1 B VT ESC

1 1 0 0 C FF FS

1 1 0 1 D CR

1 1 1 0 E SO

1 1 1 1 F SI

GS

RS

US

.

-

/

+

,

)

*

0

1

0

2

0

1

1

3

=

>

?

;

<

9

:

6

7

4

5

8

2

3

0

1

1

0

1

5

]

^

_

[

¥

Y

Z

T

U

V

W

X

R

S

P

Q

1

0

0

4

M

N

O

K

L

J

I

F

G

D

E

H

B

C

@

A

1

1

1

7

}

˜

DEL

|

{ y z v w t u x r s p q

1

1

0

6 m n o k l j i f g d e h b c

‘ a

IMR01K02-E1

47

MEMO

48

IMR01K02-E1

The first edition: NOV. 2001

The third edition: JUN.2000

RKC INSTRUMENT INC.

HEADQUARTERS: 16-6, KUGAHARA 5-CHOME, OHTA-KU TOKYO 146-8515 JAPAN

PHONE: 03-3751-9799 (+81 3 3751 9799)

E-mail: [email protected]

FAX: 03-3751-8585 (+81 3 3751 8585)

IMR01K02-E1 NOV. 2001

RKC INSTRUMENT SA201 Instruction Manual

Temperature Controller

Communication

Instruction Manual

RKC INSTRUMENT INC.

WARNING

CAUTION

!

CONTENTS

1. OUTLINE

1

2

2. SPECIFICATIONS

3

4

3. WIRING

!

WARNING

To prevent electric shock or instrument failure, do not turn on the power until all the wiring is completed.

5

6

4. SETTING

4.1 Transfer to Communication Setting Mode

4.2 Setting the Communication Parameters

7

8

9

10

4.3 Communication Requirements

11

12

5. RKC COMMUNICATION PROTOCOL

(1) Data link initialization

(2) Data sent from host computer - Polling sequence

(3) Data sent from the controller

(4) EOT sent from the controller (Ending data transmission from the controller)

(5) No response from the controller

(6) ACK Acknowledgment

(7) NAK Negative acknowledge

(8) No response from host computer

(9) Indefinite response from host computer

(10) EOT Data link termination

(1) Data link initialization

(2) Sending selecting address from the host computer

(3) Data sent from the host computer

(4) ACK Acknowledgment

(5) Negative acknowledge NAK

(6) No response from controller

(7) EOT Data link termination

6. MODBUS COMMUNICATION PROTOCOL

(1) Normal response

(2) Defective message response

(3) No response

6.6.1 Read holding registers [03H]

6.6.2 Preset single register [06H]

6.6.3 Diagnostics (loopback test) [08H]

6.7.1 Data range

Data processing with decimal points

6.7.2 Data processing precautions

7. INPUT RANGE TABLES

41

42

43

8. TROUBLESHOOTING

!

WARNING

power before replacing the instrument.

before mounting or removing the instrument.

all the wiring is completed.

instrument.

experience in this type of work.

44

CAUTION

45

46

9. ASCII 7-BIT CODE TABLE (REFERENCE)

47

48

Related manuals

RKC INSTRUMENT