RKC SA201 Instruction Manual

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Temperature Controller

SA201

Communication

Instruction Manual

RKC INSTRUMENT INC.

IMR01K02-E1

!"Modbus is a registered trademark of Schneider Electric. !"Company names and product names used in this manual are the trademarks or registered trademarks of

the respective companies.

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

CAUTION

: 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.

: 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

An external protection device must be installed if failure of this instrument

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

All wiring must be completed before power is turned on to prevent electric

shock, fire or damage to instrument and equipment.

This instrument must be used in accordance with the specifications to prevent

fire or damage to instrument and equipment.

This instrument is not intended for use in locations subject to flammable or

explosive gases.

Do not touch high-voltage connections such as power supply terminals, etc.

to avoid electric shock.

RKC is not responsible if this instrument is repaired, modified or

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

IMR01K02-E1

i-1

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 high-

voltage 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.

i-2

IMR01K02-E1

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

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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.

Host computer or

PLC, etc.

RS-232C

SA201

RS-485

SA201

RS-232C/RS-485

converter

SA201

IMR01K02-E1

2. SPECIFICATIONS

RKC communication

!"!"

Interface: Based on RS-485, EIA standard

Connection method: 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: ANSI X3.28 subcategory 2.5, A4

Polling/selecting type

Error control: Vertical parity (With parity bit selected)

Horizontal parity (BCC check)

Communication code: ASCII 7-bit code

Termination resistor: Externally connected

Xon/Xoff control: None

Maximum connections: 32 instruments maximum including a host computer

Signal logic: RS-485

Signal voltage Logic

V (A) - V (B) ≥ 2 V 0 (SPACE) V (A) - V (B) ≤ -2 V 1 (MARK)

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

IMR01K02-E1

2. SPECIFICATIONS

Modbus

!"!"

Interface: Based on RS-485, EIA standard

Connection method: 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: 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: 03H (Read holding registers)

06H (Preset single register) 08H (Diagnostics: loopback test)

Error check method: CRC-16

Error code: 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

Termination resistor: Externally connected

Maximum connections: 32 instruments maximum including a master

Signal logic: RS-485

Signal voltage Logic

IMR01K02-E1

V (A) - V (B) ≥ 2 V 0 (SPACE) V (A) - V (B) ≤ -2 V 1 (MARK)

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

3. WIRING

(B)

(A)

(B)

(A)

)

(B)

(A)

WARNING

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

Terminal number and signal details

!"!"

Terminal

Signal name Symbol

No.

10 Signal ground SG

11 Send data/Receive data T/R (A)

12 Send data/Receive data T/R (B)

Wiring method

!"!"

Connection to the RS-485 port of the host computer (master)

#"#"

SA201

(Slave)

T/R

Communication

terminal

$ $ $

SA201

(Slave)

RS-485

Shielded twisted

pair wire

Paired wire

* R

Host com

SG T/R

T/R

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

uter (Master)

SD (TXD

RD (RXD

Send/Receive transfer signal

Send data

：

Receive data

：

terminal

* R

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

IMR01K02-E1

T/R

Communication

31 max.

Connection to the RS-232C port of the host computer (master)

(

!"!"

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

SA201

(Slave)

T/R (A)

RS-485

Paired wire

T/R (A)

RS-232C

3. WIRING

T/R (B)

Communication

connector

* R * R

Shielded twisted

pair wire

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

T/R (B)

RS-232C/RS-485

converter

Host computer

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.

Connection with up to 31 SA201 (slaves) and one host computer (master)

!"!"

Host computer (Master)Host computer (Master)

RS-232C

RS-485

RS-232C/RS-485 converter

RS-485

Master)

Junction terminal

Device address (Slave address)

SA201

(Slave)

IMR01K02-E1

3029 311 2 3 4

SA201 (Slave)

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

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

Communication Setting Mode

(Setting the communication

parameters)

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.

SET

SA201

R/S

SV2

ALM1

ALM2

OUT1

OUT2

PV/SV display

SET

SA201

R/S

Device address (Slave address)

Communication setting mode

SV2

ALM1

ALM2

OUT1

OUT2

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

!"!"

Setting procedure vary depending on the communication parameter.

Device address

•

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

, interval time

Add

InT

Communication speed

•

, data bit configuration

bPS

bIT

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

Device address

(Slave address)

Press the SET key.

Communication

Press the SET key.

SVPV

Data configuration

Press the SET key.

[

Add

speed

[

bPS

[

bIT

]

Press the SET key.

Registration of set value

!"!"

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

3. WIRING

Description of each parameters

!"!"

Symbol Name Setting range Description Factory

set value

Device address (Slave address)

(Add)

Communication speed

(bPS)

Data bit configuration

(bIT)

Interval time * 0 to 250 ms The SA201’s interval time

(InT)

Data bit configuration table

0 to 99

240: 2400 bps 480: 4800 bps 960: 9600 bps 1920: 19200 bps

See data bit configuration table

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).

must match the specifications of the host computer.

960

8n1

Set value Data bit Parity bit Stop bit

(7n1) 7 Without 1

(7n2) 7 Without 2

(7E1) 7 Even 1

(7E2) 7 Even 2

(7o1) 7 Odd 1

(7o2) 7 Odd 2

(8n1) 8 Without 1

Setting range of RKC communication

(8n2) 8 Without 2

(8E1) 8 Even 1

(8E2) 8 Even 2

Setting range of Modbus

(8o1) 8 Odd 1

(8o2) 8 Odd 2

* 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

Setting procedure example

!"!"

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.

SET

SA201

R/S

SV2

ALM1

ALM2

OUT1

OUT2

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.

SET

SA201

R/S

SV2

ALM1

ALM2

OUT1

OUT2

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

SET

SA201

R/S

SV2

ALM1

ALM2

OUT1

OUT2

Continued on the next page.

IMR01K02-E1

3. WIRING

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

SET

SA201

R/S

SV2

ALM1

ALM2

OUT1

OUT2

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.

SET

SA201

R/S

SV2

ALM1

ALM2

OUT1

OUT2

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

%%%%

IMR01K02-E1

3. WIRING

4.3 Communication Requirements

Processing times during data send/receive

!"!"

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 Time (ms)

MIN TYP MAX

Response send time after SA201 receives ENQ 1.6 4.0 12

Response send time after SA201 receives ACK 1.6

Response send time after SA201 receives NAK 1.6

Response send time after SA201 sends BCC

RKC communication (Selecting procedure)

Procedure details Time (ms)

Response send time after SA201 receives BCC 1.6 3.0 10

Response wait time after SA201 sends ACK

Response wait time after SA201 sends NAK

Modbus

Procedure details Time (ms)

Read holding registers [03H] Response transmission time after the slave receives the query message

Preset single register [06H] Response transmission time after the slave receives the query message

Diagnostics (loopback test) [08H] Response transmission time after the slave receives the query message

−−

MIN TYP MAX

−−

−

13 ms max.

6 ms max.

1.0

IMR01K02-E1

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

3. WIRING

RS-485 (2-wire system) send/receive timing

!"!"

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:

Polling procedure

#"#"

Send data

(Possible/Impossible)

Host computer

Sending status

Send data

Controller

: Response send time after SA201 receives [ENQ] + Interval time

: Response send time after SA201 sends BCC

: Response send time after SA201 receives [ACK] + Interval time or

(Possible/Impossible)

Sending status

Possible

Impossible

Possible

Impossible

E O

- - - - -

E N

bca

- - - - -

T X

B C C

A C K

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

A K

Selecting procedure

#"#"

Send data

(Possible/Impossible)

Host computer

Sending status

Send data

Controller

Response send time after SA201 receives BCC + Interval time

Response wait time after SA201 sends ACK or Response wait time after SA201 sends NAK

(Possible/Impossible)

Sending status

Possible

Impossible

Possible

Impossible

- - - - -

T X

B C C

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

Fail-safe

!"!"

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).

!"The polling/selecting procedures are a centralized control method where the host computer

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

!"The code use in communication is 7-bit ASCII code including transmission control characters.

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:

Host com

Address

O T

(1)

ID: Identifier

uter send

(2)

Host

Controller send

E N

No response

computer send

Controller send

(5)

(4)

(3)

E T X

BCC

(8)

No response

Time out

T X

Data

(9)

Indefinite

Host computer send

E O T

(10)

E O T

(6)

C K

(7)

IMR01K02-E1

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:

Example:

ENQ

M02

Device

address

3.2.1.

ENQ

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:

3.2. 5.4.1.

Identifier Data BCCETXSTX

IMR01K02-E1

5. RKC COMMUNICATION PROTOCOL

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:

5STX

30H

30H35H30H30H30H31H4DH

03H

BCCETX0001M

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

5. RKC COMMUNICATION PROTOCOL

(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.

IMR01K02-E1

5.1.2 Polling procedure example

Normal transmission

#"#"

5. RKC COMMUNICATION PROTOCOL

Host computer send

E OT01M1EN

Polling address

Error transmission

#"#"

Host computer send

01M1

O T

Polling address

Identifier

E N Q

M10 0 1 0.0

T X

Identifier

M10 0 1

T X

Data

Send data

Controller send

Error data

Host computer send Host computer send

A C K

Host computer send Host computer send

AA000000

T X

Next send data Controller send

N A K

M1 00 1 0.0

T X

E T X

E O T

B C C

A C K

B C C

IMR01K02-E1

Identifier

Data

Send data

Controller send

Re-send data

Controller send

5. RKC COMMUNICATION PROTOCOL

[

]

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:

Host computer send

E O T

(7)

E O T

(1)

Address

(2)

Host com

S T X

uter send

[ Identifier ]

[ Data ]

(3)

[ BCC ]

T X

Controller send

No response

(6)

(4)

(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

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

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

(2 digits)

IMR01K02-E1

5. RKC COMMUNICATION PROTOCOL

(3) Data sent from the host computer

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

2.1.

Identifier Data BCCETXSTX

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).

About numerical data

!"!"

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

0.5 100.5

0 100

• 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

-.5 -.058 .05 -0

Receive data

-0.50 -0.05 0.05 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

5. RKC COMMUNICATION PROTOCOL

(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.

IMR01K02-E1

5.2.2 Selecting procedure example

Normal transmission

#"#"

5. RKC COMMUNICATION PROTOCOL

Host computer send

E O T

Selecting address

Error transmission

#"#"

E OT01

Selecting address

S1200.0

T X

Identifier

Host computer send

S TXS1210.0ET

Identifier

Send data

Data

Send data

Data

Controller send

Error data

B C C

Controller send

Host computer send Host computer send

P11.0

T X

A C K

N A K

Next send data

Host computer send Host computer send

S TXS1200.0ET

Re-send data

Controller send

A C K

B C C

Controller send

E O T

A C K

S TXP1

……

IMR01K02-E1

5. RKC COMMUNICATION PROTOCOL

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.

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

Name Iden-

Model code

Measured value (PV)

Burnout

Alarm 1 status

Alarm 2 status

Heat-side manipulated output value

Cool-side manipulated output value

Error code

RUN/STOP function

Autotuning

Self-tuning

tifier

Description Factory set

value

Attrib-

ute

Display the model code ----- RO

Within input range. ----- RO

0: OFF 1: ON ----- RO

-5.0 to +105.0 % ----- RO

0: No error

----- RO

Except 0: Error occurs

0: RUN 1: STOP 0 R/W

0: Autotuning OFF

0R/W 1: Autotuning ON After autotuning is completed, setting will automatically change to 0.

0: Self-tuning OFF

0R/W 1: Self-tuning ON

Set value (SV)

Within input range. Temperature

input: 0 or 0.0

Voltage/current inputs: 0.0

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.

Continued on the next page.

R/W

IMR01K02-E1

Continued from the previous page.

5. RKC COMMUNICATION PROTOCOL

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

Name Iden-

Alarm 1 set value

Alarm 2 set value

Control loop break alarm

Control loop break alarm deadband

Heat-side proportional band

tifier

Description Factory set

Process alarm, SV alarm:

Setting limiter (low limit) to

setting limiter (high limit)

Deviation alarm: -span to +span

However, within -1999 to +9999 °C [°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:

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.

value

Temperature input: 50 or 50.0

Voltage/current inputs: 5.0

8.0 R/W

0R/W

Temperature input: 30 or 30.0

Voltage/current inputs: 3.0

Attrib-

ute

R/W

Integral time

0 to 3600 seconds (0: PD action)

240 R/W

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

Derivative time

0 to 3600 seconds (0: PI action)

60 R/W

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

Anti-reset windup

0 to 100 % of heat-side proportional

100 R/W

band (0: Integral action OFF)

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

Heat-side

1 to 100 seconds Note1 R/W

proportioning cycle time

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.

Note1 Relay contact output: 20 Voltage pulse output: 2

Continued on the next page.

IMR01K02-E1

5. RKC COMMUNICATION PROTOCOL

Continued from the previous page.

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

Name Iden-

Cool-side proportional band

Overlap/deadband

tifier

1 to 1000 % of heat-side proportional

band

-span to +span

Description Factory set

value

100 R/W

0 or 0.0 R/W

Attrib-

ute

However, within -1999 to +9999 °C [°F] or -199.9 to +999.9 °C [°F]

Cool-side

1 to 100 seconds Note1 R/W

proportioning cycle time

PV bias

-span to +span

However, within -1999 to +9999 °C [°F] or -199.9 to +999.9 °C [°F]

Temperature input: 0 or 0.0

Voltage/current

R/W

inputs: 0.0

Digital filter

Set data lock function

If heat/cool PID control with autotuning (water cooling/air cooling) for control type is not selected,

0 to 100 seconds (0: OFF) 0 R/W

0000 to 1111 0000 R/W

the attribute becomes RO.

Details of set data lock function:

Set data Set value (SV)

0000

0001

0010

0011

0100

0101

0110

1111

×× × ×× − ×− × ×− −

−× ×

−× −

−− ×

−− −

(First alarm, Second alarm)

Alarm setting

Other setting items

(×) 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.

Note1 Relay contact output: 20 Voltage pulse output: 2

Continued on the next page.

IMR01K02-E1

Continued from the previous page.

5. RKC COMMUNICATION PROTOCOL

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

Name Iden-

EEPROM storage

mode

tifier

0: Backup mode

(Set values are store to the EEPROM)

Description Factory set

value

0R/W

Attrib-

ute

1: Buffer mode

(No set values are store to the EEPROM)

EEPROM storage

status

The non-volatile memory (EEPROM) has limitations on the number of memory rewrite times. If the

0: Mismatch 1: Match

----- RO

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.

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

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

Slave address

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

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

Function code

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).

Data

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).

Error check

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

6.2 Function Code

Function code contents

6. MODBUS COMMUNICATION PROTOCOL

Function code (Hexadecimal)

03H Read holding registers Measured value (PV), alarm status, etc.

06H Preset single register

08H Diagnostics (loopback test) Diagnostics (loopback test)

Message length of each function (Unit: byte)

Function code Function Query message Response message

(Hexadecimal) Min Max Min Max

03H Read holding registers 8 8 7 255

06H Preset single register 8 8 8 8

08H Diagnostics (loopback test) 8 8 8 8

Function Contents

Set value (SV), alarm set value, PID constants, PV bias, etc. (For each word)

6.3 Communication Mode

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

RTU mode

Items Contents

Data bit length 8 bit (Binary)

Start mark of message Unused

End mark of message Unused

Message length See 6.2 Function Code (P. 27)

Data time interval 24 bit’s time or less *

Error check 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

6. MODBUS COMMUNICATION PROTOCOL

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 Contents

1 Function code error (Specifying nonexistent function code)

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

(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. MODBUS COMMUNICATION PROTOCOL

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

6. MODBUS COMMUNICATION PROTOCOL

The flow chart of CRC-16

!"!"

START

FFFFH

CRC Register ⊕ next byte of the message

Shift CRC Register right 1 bit

CRC Register

⊕

CRC Register

→

0 → n

Carry flag is

Yes

A001H

n + 1 → n

→

CRC Register

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. MODBUS COMMUNICATION PROTOCOL

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 02H

Function code 03H

Starting number High 00H

Low 00H

Quantity High 00H

Low 03H

CRC-16 High 05H

Low F8H

First holding register address

The setting must be between 1 and 125 (0001H and 007DH).

Normal response message

Slave address 02H

Function code 03H

Number of data 06H

First holding High 00H

Next holding High 00H

CRC-16 High 75H

Low ACH

Error response message

Slave address 02H

80H + Function code 83H

Error code 03H

CRC-16 High F1H

Low 31H

Number of holding registers × 2

IMR01K02-E1

6. MODBUS COMMUNICATION PROTOCOL

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 01H

Function code 06H

Holding register High 00H

number Low 10H

Write data High 01H

Low 02H

CRC-16 High 08H

Low 5EH

Any data within the range

Normal response message

Slave address 01H

Function code 06H

Holding register High 00H

number Low 10H

Write data High 01H

Low 02H

CRC-16 High 08H

Low 5EH

Error response message

Slave address 01H

80H + Function code 86H

Error code 02H

CRC-16 High CDH

Low C1H

Contents will be the same as query message data.

IMR01K02-E1

6. MODBUS COMMUNICATION PROTOCOL

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 01H

Function code 08H

Test code High 00H

Low 00H

Data High 1FH

Low 34H

CRC-16 High E9H

Low ECH

Test code must be set to 00.

Any pertinent data

Normal response message

Slave address 01H

Function code 08H

Test code High 00H

Low 00H

Data High 1FH

Low 34H

CRC-16 High E9H

Low ECH

Error response message

Slave address 01H

80H + Function code 88H

Error code 03H

CRC-16 High 06H

Low 01H

Contents will be the same as query message data.

IMR01K02-E1

6. MODBUS COMMUNICATION PROTOCOL

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

Data with decimal points

!"!"

Data with one decimal place

#"#"

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

Control loop break alarm

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

80 = 0050H

Control loop break High 00H

alarm Low 50H

Data without decimal points

!"!"

Alarm 1 status Anti-reset windup Alarm 2 status Heat-side proportioning cycle time Burnout Cool-side proportional band Autotuning Cool-side proportional cycle time Self-tuning Set data lock function Integral time RUN/STOP function Derivative time

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

Integral time High 00H

Low 32H

IMR01K02-E1

6. MODBUS COMMUNICATION PROTOCOL

Data whose decimal point’s presence and/or position depends on input range

!"!"

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) Heat-side proportional band Set value (SV) Control loop break alarm deadband Alarm 1 set value PV bias Alarm 2 set value

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

-200 = 0000H - 00C8H = FF38H

Set value (SV) High FFH

Low 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

6. MODBUS COMMUNICATION PROTOCOL

6.8 Communication Data List

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

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

Address Name Description Factory set

value

00H

Measured value

Within input range. ----- RO

(PV)

03H

04H

05H

06H

Alarm 1 status 0: OFF 1: ON ----- RO

Alarm 2 status 0: OFF 1: ON ----- RO

Burnout 0: OFF 1: ON ----- RO

Set value (SV) Within input range. Temperature

input: 0 or 0.0

Voltage/current inputs: 0

07H

08H

Alarm 1 set value Process alarm, SV alarm:

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

Alarm 2 set value Deviation alarm: -span to +span

However, within -1999 to +9999 °C

Temperature input: 50 or 50.0

Voltage/current inputs: 5.0

[°F] or -199.9 to +999.9 °C [°F]

0BH

0CH

Control loop break alarm

Control loop break alarm deadband

0.0 to 200.0 minutes (0.0: OFF)

0 (0.0) to span However, less than 9999

8.0 R/W

0R/W

Attrib-

ute

R/W

0DH

Autotuning 0: Autotuning OFF

0R/W 1: Autotuning ON After autotuning is completed, setting will automatically change to 0.

0EH

Self-tuning 0: Self-tuning OFF

0R/W 1: Self-tuning ON

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.

Continued on the next page.

IMR01K02-E1

Continued from the previous page.

6. MODBUS COMMUNICATION PROTOCOL

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

Address Name Description Factory set

value

0FH

Heat-side proportional band

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

Temperature input: 30 or 30.0

Voltage/current inputs: 3.0

function is on, only Read is available.

10H

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

240 R/W

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

11H

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

60 R/W

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

12H

Anti-reset windup 0 to 100 % of heat-side proportional

100 R/W

band (0: Integral action OFF)

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

Attrib-

ute

R/W

13H

Heat-side

1 to 100 seconds Note1 R/W

proportioning cycle time

14H

15H

Cool-side proportional band

Overlap/deadband -span to +span

1 to 1000 % of heat-side proportional

band

100 R/W *

0 or 0.0 R/W *

However, within -1999 to +9999 °C [°F] or -199.9 to +999.9 °C [°F]

16H

Cool-side

1 to 100 seconds Note1 R/W *

proportioning cycle time

17H

PV bias -span to +span

However, within -1999 to +9999 °C [°F] or -199.9 to +999.9 °C [°F]

Temperature input: 0 or 0.0

Voltage/current

R/W

inputs: 0.0

Note1 Relay contact output: 20 Voltage pulse output: 2 * If heat/cool PID control with autotuning (water cooling/air cooling) for control type is not selected,

the attribute becomes RO.

Continued on the next page.

IMR01K02-E1

6. MODBUS COMMUNICATION PROTOCOL

Continued from the previous page.

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

Address Name Description Factory set

value

18H

Set data lock

0 to 7 0 R/W

function *

19H

RUN/STOP

0: RUN 1: STOP 0 R/W

function

1AH

Digital filter 0 to 100 seconds (0: OFF) 0 R/W

* Details of set data lock function:

Set data Set value (SV)

×× × ×× − ×− × ×− −

−× ×

−× −

(First alarm, Second alarm)

Alarm setting

Other setting items

Attrib-

ute

−− ×

−− −

(×) 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.

Continued on the next page.

IMR01K02-E1

Continued from the previous page.

6. MODBUS COMMUNICATION PROTOCOL

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

Address Name Description Factory set

Attrib-

value

1BH

EEPROM storage

mode

0: Backup mode

(Set values are store to the EEPROM)

0R/W

1: Buffer mode

(No set values are store to the EEPROM)

1CH

1DH

EEPROM storage

status

Heat-side

0: Mismatch

1: Match

-5.0 to +105.0 % ----- RO

----- RO

manipulated output value

1EH

Cool-side

-5.0 to +105.0 % ----- RO

manipulated output value

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.

ute

• 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.

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

7. INPUT RANGE TABLES

Input Range Table 1

Input type Input range Code

Input Range

Thermocouple

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

Continued on the next page.

K01 K02 K03 K04 K05 K06 K07 K08 K09 K10 K13 K14 K17 K20 K29 K37 K38 KA1 KA2 KA3 KA4 KA9 KB2

J01 J02 J03 J04 J05 J06 J07 J08 J09 J10 J22 J23 J30

IMR01K02-E1

Continued from the previous page.

Input type Input range Code

7. INPUT RANGE TABLES

Input Range

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 0 to 1769 °C

0 to 1350 °C 0 to 3200 °F 0 to 3216 °F 0 to 1600 °C

0 to 1769 °C 0 to 3200 °F 0 to 3216 °F

400 to 1800 °C

Thermocouple B

0 to 1820 °C

800 to 3200 °F

0 to 3308 °F

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

-199.9 to +400.0 °C

-199.9 to +100.0 °C

-100.0 to +200.0 °C

0.0 to 350.0 °C

-199.9 to +752.0 °F

-100.0 to +200.0 °F

-100.0 to +400.0 °F

0.0 to 450.0 °F

0.0 to 752.0 °F

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

Accuracy is not guaranteed between

199.9 to -100.0 °C (-199.9 to -148.0 °F)

JA1 JA2 JA3 JA6 JA7 JA9 JB6

R01 R02 R04 RA1 RA2 S01 S02 SA1 SA2 B01

B02 BA1

BA2 E01 E02 EA1

EA2 N01 N02 N06 NA1 NA2 NA5

T01

T02

T03

T04

TA1

TA2

TA3

TA4

TA5

Continued on the next page.

IMR01K02-E1

7. INPUT RANGE TABLES

Continued from the previous page.

Input type Input range Code

Input Range

W5Re/W26Re

PL II

Thermocouple

RTD Pt100

* Accuracy is not guaranteed between

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 °FDA6

0.0 to 200.0 °FDA7

0.0 to 400.0 °FDA8

0.0 to 500.0 °FDA9

199.9 to -100.0 °C (-199.9 to -148.0 °F)

W01 W02 WA1

A01 A02 A03 AA1 AA2 U01 U02 U03 UA1 UA2 UA3

L01 L02 LA1

LA2 D01 D02 D03 D04 D05 D06 D07 D08 D09 D10 DA1 DA2 DA3 DA4 DA5

Continued on the next page.

IMR01K02-E1

Continued from the previous page.

Input type Input range Code

7. INPUT RANGE TABLES

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

RTD JPt100

-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

Input Range Table 2

Input type Input range Code

Input Range

0 to 5 V DC 4 01

Voltage 0 to 10 V DC 5 01

1 to 5 V DC 0. 0 to 100.0 % 6 01

Current 0 to 20 mA DC 7 01

4 to 20 mA DC 8 01

P01

P02

P03

P04

P05

P06

P07

P08

P09

P10

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

terminals.

IMR01K02-E1

8. TROUBLESHOOTING

WARNING

To prevent electric shock or instrument failure, always turn off the system

power before replacing the instrument.

To prevent electric shock or instrument failure, always turn off the power

before mounting or removing the instrument.

To prevent electric shock or instrument failure, do not turn on the power until

all the wiring is completed.

To prevent electric shock or instrument failure, do not touch the inside of the

instrument.

All wiring must be performed by authorized personnel with electrical

experience in this type of work.

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.

RKC communication

!"!"

Problem Probable cause Solution

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

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

Wrong address setting

Continued on the next page.

IMR01K02-E1

8. TROUBLESHOOTING

Continued from the previous page.

Problem Probable cause Solution

No response Error in the data format 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 Confirm the identifier is correct or that

with the correct function is specified. Otherwise correct it

Error in the data format Reexamine the communication program

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

framing error, etc.

BCC error

The data exceeds the setting range Confirm the setting range and transmit

The specified identifier is invalid Confirm the identifier is correct or that

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

correct data

with the correct function is specified. Otherwise correct it

IMR01K02-E1

8. TROUBLESHOOTING

Modbus

!"!"

Problem Probable cause Solution

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

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

Error code1Function cod error

(Specifying nonexistent function code)

Error code2When written to read only (RO) data,

When any address other than 0000H to 001AH is specified, etc.

Error code3When 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

Error code4Self-diagnostic error Turn off the power to the instrument. If

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

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

Confirm the function code

Confirm the address of holding register

Confirm the setting data

the same error occurs when the power is turned back on, please contact RKC sales office or the agent.

IMR01K02-E1

9. ASCII 7-BIT CODE TABLE (REFERENCE)

This table is only for use with RKC communication.

b700001111

b600110011

b501010101

b5 to b7b4b3b2b1 01234567

00000NULDLE SP 0 @ P ‘ p

00011SOHDC1 ! 1 A Q a q

00102STXDC2 ” 2 B R b r

00113ETXDC3 # 3 C S c s

01004EOTDC4 $ 4 D T d t

01015ENQNAK % 5 E U e u

01106ACKSYM & 6 F V f v

01117BELETB ’ 7 G W g w

10008 BS CAN ( 8 H X h x

10019 HT EM ) 9 I Y i y

1010A LF SUB * : J Z j z

1011B VT ESC + ; K [ k {

1100C FF FS , < L ¥ l |

1101D CR GS - = M ] m }

1110E SO RS . > N ^ n ˜

1111F SI US / ? O _ o DEL

IMR01K02-E1

MEMO

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: info@rkcinst.co.jp FAX: 03-3751-8585 (+81 3 3751 8585)

IMR01K02-E1 NOV. 2001

RKC SA201 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARNING

CAUTION

CONTENTS

1. OUTLINE

2. SPECIFICATIONS

3. WIRING

4. SETTING

4.1 Transfer to Communication Setting Mode

4.2 Setting the Communication Parameters

4.3 Communication Requirements

5. RKC COMMUNICATION PROTOCOL

5.1 Polling

5.1.1 Polling procedures

5.1.2 Polling procedure example

5.2 Selecting

5.2.1 Selecting procedures

5.2.2 Selecting procedure example

5.3 Communication Identifier List

6. MODBUS COMMUNICATION PROTOCOL

6.1 Message Format

6.2 Function Code

6.3 Communication Mode

6.4 Slave Responses

6.5 Calculating CRC-16

6.6 Message Format

6.6.1 Read holding registers [03H]

6.6.2 Preset single register [06H]

6.6.3 Diagnostics (loopback test) [08H]

6.7 Data Configuration

6.7.1 Data range

6.7.2 Data processing precautions

6.8 Communication Data List

7. INPUT RANGE TABLES

8. TROUBLESHOOTING

9. ASCII 7-BIT CODE TABLE (REFERENCE)