RKC MA901 Instruction Manual

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Multi-point Digital Controller

MA900/MA901

Communication

Instruction Manual

RKC INSTRUMENT INC.

IMR01H02-E3

!"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 this 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.

IMR01H02-E3

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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.

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IMR01H02-E3

Page

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

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

3. WIRING .................................................................................5

4. SETTING ...............................................................................8

4.1 Transfer to Setup Setting Mode ......................................................................8

4.2 Setting the Communication Parameters..........................................................9

4.3 Communication Requirements ......................................................................13

5. RKC COMMUNICATION PROTOCOL ............................... 15

5.1 Polling............................................................................................................15

5.1.1 Polling procedures ............................................................................................16

5.1.2 Polling procedure example (Multi-point mode)..................................................21

5.1.3 Polling procedure example (Single mode) ........................................................24

5.2 Selecting........................................................................................................25

5.2.1 Selecting procedures........................................................................................25

5.2.2 Selecting procedure example (Multi-point mode)..............................................30

5.2.3 Selecting procedure example (Single mode) ....................................................33

5.3 Communication Identifier List ........................................................................34

6. MODBUS COMMUNICATION PROTOCOL ....................... 44

6.1 Message Format ...........................................................................................44

6.2 Function Code ...............................................................................................45

6.3 Communication Mode ...................................................................................45

6.4 Slave Responses ..........................................................................................46

6.5 Calculating CRC-16.......................................................................................47

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Page

6.6 Message Format............................................................................................49

6.6.1 Read holding registers [03H] ............................................................................49

6.6.2 Preset single register [06H] ..............................................................................50

6.6.3 Diagnostics (loopback test) [08H] .....................................................................51

6.6.4 Preset multiple registers [10H]..........................................................................52

6.7 Data Configuration ........................................................................................52

6.7.1 Data range........................................................................................................53

6.7.2 Data processing precautions ............................................................................54

6.8 Communication Data List ..............................................................................55

6.9 Data Map.......................................................................................................62

6.9.1 Reference to data map .....................................................................................62

6.9.2 Data map list.....................................................................................................63

7. INPUT RANGE TABLES..................................................... 75

8. TROUBLESHOOTING ........................................................ 79

9. ASCII 7- BIT CODE TABLE ................................................82

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IMR01H02-E3

1. OUTLINE

Multi-point Digital Controller MA900/MA901 interfaces with the host computer via Modbus or RKC communication protocols. In RKC communication, there are the data format (multi-point mode) in which the MA900/MA901 is used as a multi-point controller (for the MA900: 4 channels and for the MA901: 8 channels) and that (single mode) used as multidrop-connected with a single controller. In addition, the three types of communication interfaces are available: RS-422A, RS-485 and RS-232C. For reference purposes, the Modbus protocol identifies the host computer as master, the MA900/MA901 as slave.

RS-422A or RS-485

Host computer

RS-422A or RS-485

RS-232C

MA900

MA901

Host computer

MA900

MA901

MA900

MA901

RS-232C

MA900

MA901

MA900

MA901

･････････

MA900

MA901

IMR01H02-E3

2. SPECIFICATIONS

RKC communication

!"!"

Interface: Based on RS-422A, EIA standard

Based on RS-485, EIA standard Based on RS-232C, EIA standard (Specify when ordering)

Connection method: 4-wire system, half-duplex multi-drop connection (RS-422A)

2-wire system, half-duplex multi-drop connection (RS-485) 3-wire system, point-to-point connection (RS-232C)

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 (RS-485)

Xon/Xoff control: None

Maximum connections: Multi-point mode (MA900/MA901)

RS-422A, RS-485: 32 instruments maximum including a host computer RS-232C: 1 instrument

Single mode (MA900) *

RS-422A, RS-485: 26 instruments maximum including a host computer RS-232C: 1 instrument

Single mode (MA901) *

RS-422A, RS-485: 13 instruments maximum including a host computer RS-232C: 1 instrument

* As the address setting range is from 00 to 99, addresses corresponding to four

MA900s or eight MA901s are used in the single mode.

Therefore, the connectable number of sets is limited.

IMR01H02-E3

Signal logic: RS-422A, 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.

RS-232C

Signal voltage Logic

+3 V or more 0 (SPACE)

-3 V or less 1 (MARK)

2. SPECIFICATIONS

Modbus

!"!"

Interface: Based on RS-422A, EIA standard

Based on RS-485, EIA standard Based on RS-232C, EIA standard (Specify when ordering)

Connection method: 4-wire system, half-duplex multi-drop connection (RS-422A)

2-wire system, half-duplex multi-drop connection (RS-485) 3-wire system, point-to-point connection (RS-232C)

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 or 2 (However, with the parity bit selected: 1 bit fixed)

Protocol: Modbus

Signal transmission mode: Remote Terminal Unit (RTU) mode

Function code: 03H (Read holding registers)

06H (Preset single register) 08H (Diagnostics: loopback test) 10H (Preset multiple registers)

IMR01H02-E3

2. SPECIFICATIONS

Error check method: CRC-16

Error code: 1: Function code error

2: When any address other than 0000H to 02EEH and 1388H to 14A0H

are specified

3: 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 (RS-485)

Maximum connections: RS-422A, RS-485: 32 instruments maximum including a master

RS-232C: 1 instrument

Signal logic: RS-422A, 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.

RS-232C

Signal voltage Logic

+3 V or more 0 (SPACE)

-3 V or less 1 (MARK)

IMR01H02-E3

3. WIRING

WARNING

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

Connection to the RS-422A port of the host computer (master)

Communication terminal number and signal details

Terminal No. Signal name Symbol

44 Signal ground SG

45 Send data T (A)

46 Send data T (B)

47 Receive data R (A)

48 Receive data R (B)

Wiring method

MA900/MA901

(Slave)

T (A)

T (B)

R (A)

R (B)

Communication terminals

$ $ $

MA900/MA901

(Slave)

T (A)

T (B)

Paired wire

RS-422A

Host computer (Master)

T (A)

T (B)

R (A)

R (B)

Shielded twisted

pair wire

Communication terminals

IMR01H02-E3

R (A)

R (B)

Maximum connections: Multi-point mode: 31 instruments (MA900/MA901)

Single mode: 25 instruments (MA900)

12 instruments (MA901)

The cable is provided by the customer.

3. WIRING

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

!"!"

Communication terminal number and signal details

#"#"

Terminal No. Signal name Symbol

44 Signal ground SG

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

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

Wiring method

#"#"

MA900/MA901

(Slave)

RS-485

Paired wire

Host computer (Master)

T/R (A)

T/R (B)

Communication terminals

$ $ $

MA900/MA901

(Slave)

T/R (A)

T/R (B)

Communication terminals

The cable is provided by the customer.

T/R (A)

T/R (B)

Shielded twisted

pair wire

Maximum connections: Multi-point mode: 31 instruments (MA900/MA901)

Single mode: 25 instruments (MA900)

Single mode: 12 instruments (MA901)

*R: Termination resistors

(Example: 120 Ω 1/2 W )

IMR01H02-E3

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

!"!"

Communication terminal number and signal details

#"#"

Terminal No. Signal name Symbol

44 Signal ground SG (GND)

45 Send data SD (TXD)

46 Receive data RD (RXD)

Wiring method

#"#"

3. WIRING

MA900/MA901

(Slave)

SG (GND)

SD (TXD)

RD (RXD)

Communication terminals

Number of connection: 1 instrument

RS-232C

Shielded wire

Host computer (Master)

SG (GND)

SD (TXD)

RD (RXD)

RS (RTS)

CS (CTS)

Short RS and CS within connector.

The cable is provided by the customer.

Connection example (For the MA900/MA901 multi-point mode)

!"!"

Connection with up to 31 MA900/MA901 (slaves) and one host computer (master)

Host computer (Master)

Device address (Slave address)

IMR01H02-E3

1 2

MA900/MA901

RS-422A

RS-485

Junction terminals

3 4 29 30 31

MA900/MA901

(Slave)

4. SETTING

To establish communication parameters between host computer (master) and MA900/MA901 (slave), it is necessary to set the device address (slave address), communication speed, data bit configuration and interval time on each MA900/MA901 (slave) in the setup setting mode.

Power ON

Input Type/Input Range Display

(Display for approx. 4 seconds)

Display changes automatically

PV/SV Monitor 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.

Setup Setting Mode

(Setting the communication

parameters)

Power is turned on again

(Registration of set value)

4.1 Transfer to Setup Setting Mode

To go the setup setting mode, you must be in PV/SV monitor mode. The first parameter to be displayed will be the autotuning, ATU. Press the SET key several times to change to the device address “Add.”

SET

R/S

PV/SV monitor mode

SET

R/S

AREA

MA900

Setup setting mode

Autotuning (AT) setting

SET

R/S

AREA

MA900

Device address setting

(Slave address)

AREA

MA900

When let setup 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 monitor mode. MA900 is used in the above figures for explanation, but the same setting procedures also apply to MA901.

IMR01H02-E3

4. SETTING

4.2 Setting the Communication Parameters

To select parameters in setup 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 or DOWN key, and choose one among the displayed set value.

For MA900: Proportioning cycle time setting (heat control) or

Cool-side proportioning cycle time setting (heat/cool control)

For MA901: Proportioning cycle time setting

Press the SET key.

PVCH

SVAREA

Device address [Add]

(Slave address)

PVCH

SVAREA

Interval time [InT]

Press the SET key.

PVCH

SVAREA

Communication speed

PVCH

SVAREA

Data bit configuration

[bPS]

Press the SET key.

[bIT]

Scan interval time

Registration of set value

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

Not by turning the power on again, the set value can also be registered by changing to RUN from STOP.

IMR01H02-E3

4. SETTING

Description of each parameters

!"!"

Symbol Name Setting range Description Factory

Device address (Slave address)

(Add)

0 to 99 (See P.16, 17)

Set it not to duplication in multidrop 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 MA900/MA901 (slave) and the host computer (master).

Set the same data bit configuration for both the MA900/MA901 (slave) and the host computer

(bPS)

(bIT)

Communication speed

Data bit configuration

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

data bit

See

configuration table

(master).

Interval time * 0 to 250 ms The MA900’s or MA901’s

interval time must match the

(InT)

specifications of the host computer.

set value

960

8n1

Data bit configuration table

Set value Data bit Parity bit Stop bit

(8n1) 8 Without 1 (8n2) 8 Without 2 (8E1) 8 Even 1

(8E2)

8Even2

Setting range of Modbus

(8o1) 8 Odd 1

(8o2)

(7n1)

(7n2)

(7E1)

(7E2)

(7o1)

(7o2)

When the Modbus communication protocol selected, this setting becomes invalid.

8 Odd 2 7 Without 1 7 Without 2 7Even1 7Even2 7 Odd 1 7 Odd 2

Setting range of RKC communication

* The interval time for the MA900/MA901 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 MA900/MA901 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 MA900’s or MA901’s interval time must match the specifications of the host computer.

No setting can be changed when “1: Lock” is selected by the lock level 1.

For the lock level 1, see the Instruction Manual (IMR01H01-E

####

IMR01H02-E3

Setting procedure example

!"!"

MA900 is used in the below figures for explanation, but the same setting procedures also apply to MA901.

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

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

4. SETTING

SET

R/S

AREA

MA900

Device address setting

(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.

AREA

MA900

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

AREA

MA900

IMR01H02-E3

SET

R/S

4. SETTING

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

SET

R/S

AREA

MA900

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 monitor mode and the value set here returns to that before the setting is changed.

SET

R/S

AREA

MA900

Communication speed setting

6. After completing all communication parameter settings, turn on the power again, and register the set value which changed. After the power is turned on again, communication is made using the set value 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. In addition, it the communication parameter is changed at RUN, communication is made using the set value changed if returned to RUN once set to STOP.

For the RUN/STOP transfer, see the Instruction Manual (IMR01H01-E

$$$$

IMR01H02-E3

4. SETTING

4.3 Communication Requirements

Processing times during data send/receive

!"!"

The MA900/MA901 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 MA900/MA901 to send data:

-Response wait time after MA900/MA901 sends BCC in polling procedure

-Response wait time after MA900/MA901 sends ACK or NAK in selecting procedure

RKC communication (Polling procedure)

Procedure details Time (ms)

MIN TYP MAX

Response send time after MA900/MA901 receives ENQ 1 2 4

Response send time after MA900/MA901 receives ACK 1

Response send time after MA900/MA901 receives NAK 1

Response send time after MA900/MA901 sends BCC

−

−−

RKC communication (Selecting procedure)

Procedure details Time (ms)

MIN TYP MAX

Response send time after MA900/MA901 receives BCC 1 2 3

Response wait time after MA900/MA901 sends ACK

Response wait time after MA900/MA901 sends NAK

Modbus

Procedure details Time

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

Preset multiple registers [10H] Response transmission time after the slave receives the query message

−−

20 ms max.

3 ms max.

20 ms max.

IMR01H02-E3

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

4. SETTING

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 MA900/MA901 are described below:

Polling procedure

%"%"

Send data

(Possible/Impossible)

Host computer

Sending status

Send data

Controller

: Response send time after MA900/MA901 receives [ENQ] + Interval time

: Response send time after MA900/MA901 sends BCC

: Response send time after MA900/MA901 receives [ACK] + Interval time or

(Possible/Impossible)

Sending status

Possible

Impossible

Possible

Impossible

E O

- - - - -

E N Q

bca

- - - - -

T X

B C C

A C K

Response send time after MA900/MA901 receives [NAK] + Interval time

A K

Selecting procedure

%"%"

Send data

(Possible/Impossible)

Host computer

Sending status

Send data

Controller

Response send time after MA900/MA901 receives BCC + Interval time

Response wait time after MA900/MA901 sends ACK or Response wait time after MA900/MA901

(Possible/Impossible)

Sending status

Possible

Impossible

Possible

Impossible

- - - - -

T X

B C C

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 MA900/MA901 to send data:

-Response wait time after MA900/MA901 sends BCC in polling procedure

-Response wait time after MA900/MA901 sends ACK or NAK in selecting procedure

RS-422A/RS-485 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.

IMR01H02-E3

5. RKC COMMUNICATION PROTOCOL

[

]

[

]

[

]

The MA900/MA901 (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.

In RKC communication, both multi-point and single modes are available. If the single mode is required, contact our sales office or agent.

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] [ ] [ ID ]

O T

(1)

(2)

Memory area number

uter send

Host

Controller send

E N Q

No res

(4)

T S

onse

(5)

Data

E T

BCC

(3)

computer send

(8)

No response

Controller send

Time out

(9)

Indefinite

(6)

A C

A K

(7)

Host computer send

E O T

(10)

E O T

ID: Identifier

IMR01H02-E3

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

The host computer sends the polling sequence in the following two types of formats:

• Format in which no memory area number is specified, and

• Format in which the memory area number is specified.

When no memory area number is specified

To be sent in this format for any identifier not corresponding to the memory area.

3.1.

IdentifierAddress

When the memory area number is specified

Example:

1M0

To be sent in this format for any identifier corresponding to the memory area.

2.1.

Memory

area

number

4.3.

IdentifierAddress

Example:

1. Address (2 digits)

• Multi-point mode

ENQENQ

S11KK0

ENQENQ

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. 9).

IMR01H02-E3

5. RKC COMMUNICATION PROTOCOL

• Single mode

This data represents the device address and channel number of the controller to be polled. When polling any identifier without the corresponding channel number, the channel number is ignored. Each address is calculated as follows.

Calculation method of address:

Address = Device address of controller + Controller channel number - 1

Example: When 3 controllers (MA900: 4 channels) are multidrop-connected

Device address

of controller

Controller

channel number

Addresses used in

polling sequence

Controller 1 Device address 00 + CH1 - 1 = Address 00

Device address 00 + CH2 - 1 = Address 01 Device address 00 + CH3 - 1 = Address 02 Device address 00 + CH4 - 1 = Address 03

Controller 2 Device address 04 + CH1 - 1 = Address 04

Device address 04 + CH2 - 1 = Address 05 Device address 04 + CH3 - 1 = Address 06 Device address 04 + CH4 - 1 = Address 07

Controller 3 Device address 08 + CH1 - 1 = Address 08

Device address 08 + CH2 - 1 = Address 09 Device address 08 + CH3 - 1 = Address 10 Device address 08 + CH4 - 1 = Address 11

Set the device address number of the succeeding controller to four or more than four plus the same number of the previous controller. Otherwise (for example, if set to 00, 01 and 02 between Controllers 1, 2 and 3), the address used for polling is duplicated and as a result no normal communication can be made.

For example, if Address 10 is selected CH3 corresponding to Controller 3 is urged to send data.

In case of the MA901: Set the device address number of the succeeding controller to eight or more than eight plus the same number of the previous controller.

Controller 1: Device address 00, Controller 2: Device address 08, ..........

2. Memory area number (2 digits)

This is the identifier to specify the memory area number. It is expressed by affixing “K” to the head of each memory area number (from 1 to 8). In addition, if the memory area number is assigned with “K0,” this represents that control area is specified.

The memory area now used for control is called “Control area.”

If the memory area number is not specified when polling the identifier corresponding to the memory area, this represents that the control area is specified.

If any identifier not corresponding to the memory area is assigned with a memory area number, this memory area number is ignored.

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5. RKC COMMUNICATION PROTOCOL

3. 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. 34).

4. 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.

STX

Identifier Data BCC

ETX

1. STX

STX is the transmission control character which indicates the start of the text transmission (identifier and data).

2. Identifier (2 digits)

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

For details, see 5.3 Communication Identifier List (P. 34).

3. Data

Data which is indicated by an identifier of this controller, consisting of channel numbers, data, etc. It is expressed in decimal ASCII code including a minus sign (-) and a decimal point.

Channel number: 2 digit ASCII code, not zero-suppressed.

(Channel number: MA900: from 01 to 04, MA901: from 01 to 08) Channels without channel numbers may exist depending on the type identifier. In addition, in case of single mode, do not use the channel number.

Data: ASCII code. The number of digits varies depending on the type of identifier.

Multi-point mode: Zero-suppressed with spaces (20H). Single mode: Not zero-suppressed.

Data structure of identifier with channel number (Only for multi-point mode)

A data is divided from that of the next channel with a comma.

number

Space

DataChannel

Comma

Channel

number

Space

Data

For the identifier without the corresponding channel number, the same data is sent to the host computer regardless of the channel number.

Comma

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5. RKC COMMUNICATION PROTOCOL

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:

BCCETX0001M005STX

03H30H30H35H30H30H30H31H4DH

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 data is not sent from the host computer even if the data link is initialized

• 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.

(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 #### Communication identifier list (P. 35).

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.

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5. RKC COMMUNICATION PROTOCOL

(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. (Time out: 3 seconds)

(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.

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5. RKC COMMUNICATION PROTOCOL

5.1.2 Polling procedure example (Multi-point mode)

Four channels specification of MA900 is used in the procedure example for explanation, but the same setting procedures also apply to MA901. However, the 8-channel specification applies to the MA901. Therefore, refer to procedure examples by replacing the 4-channel specification for the MA900 with the 8-channel specification for the MA901.

(1) When no memory area number is specified

Normal transmission

Host computer send

0 0 M 1

Device

address

Identifier

E N

M 1 0 1 1 00 . 0 , 0 2 2 00 . 0 ,

T X

Identifier

Channel

number

Space

Controller send

Data

Comma

Channel

number

Data

Space

Continue to *1

0 3 3 00 . 0 , 0 4 4 00 . 0

Error transmission

Host computer send

0 0 M 1

Device

address

Identifier

......

4 4 00 . 0

Controller send

Channel

number

Error dataE

Data

Space

Host computer send

A K

Controller send

Comma

Channel

number

Controller re-sendController send

M 1 0 1 0 01 . 0 ,

T X

N Q

M 1 0 1 1 00 . 0 , 0 2 2 00 . 00,

T X

Identifier

A C K

Data

Space

Controller send

M 2 0 1 ......

T X

......

Host computer sendHost computer send

Continue to *1

Host computer send

E O T

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5. RKC COMMUNICATION PROTOCOL

(2) When the memory area number is specified

Normal transmission

Host computer send

0 0 K 1 S 1

Device

address

Memory area

number

Identifier

E N Q

S 1 0 1 1 00 . 0 , 0 2 2 00 . 0 ,

T X

Identifier

Channel

number

Space

Controller send

Data

Comma

Channel

number

Space

Data

Continue to *1

0 3 3 00 . 0 , 0 4 4 00 . 0

Error transmission

Host computer send

0 0 K 1 S 1

Device

address

Memory area

number

Identifier

A C K

E N Q

S 1 0 1 1 00 . 0 , 0 2 2 00 . 00,

T X

Identifier

Channel

number

Error data

Space

Data

Controller send

Comma

Channel

number

Space

Controller sendController send

A 1 10 ......

T X

Data

......

Host computer sendHost computer send

Continue to *1

E O T

4 4 00 . 0

Host computer send

A K

S T X

Controller re-sendController send

S 1 0 1 0 01 . 0 ,

Host computer send

............

E O T

IMR01H02-E3

(3) Without the channel number

Normal transmission

0 0 T L

E N Q

5. RKC COMMUNICATION PROTOCOL

Host computer sendHost computer sendHost computer send

A C K

E O T

Device

address

Identifier

Error transmission

0 0 T L

Device

address

Identifier

T L

T X

Identifier Data

E N Q

T L

T X

Identifier Data

Controller send

Error data

Controller send

Host computer send Host computer sendHost computer send

I P

T X

Identifier Data

N A K

T L

T X

Identifier

Controller send

Data

Controller re-send

E O T

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5. RKC COMMUNICATION PROTOCOL

5.1.3 Polling procedure example (Single mode)

MA900 is used in the procedure example for explanation, but the same setting procedures also apply to MA901.

(1) When no memory area number is specified

Normal transmission

0 0 M 1

E N Q

A C K

Host computer sendHost computer sendHost computer send

E O T

Address

Identifier

Error transmission

0 0 M 1

Address

Identifier

M 1 0

T X

Identifier Data Data

E N Q

S TXM101 000

Identifier

00 . 0

Controller send

Error data

Data Data

Controller send Controller re-send

M 2 00 05 . 0

T X

Identifier

N A K

S TXM1 1000.0BC

Identifier

(2) When the memory area number is specified

Normal transmission

Host computer send

0 0 K 1 S 1

E N Q

A C K

Controller send

Host computer sendHost computer sendHost computer send

E O T

E T

Host computer sendHost computer send

E O T

Address

Error transmission

0 0 K 1 S 1

Address

Identifier

Memory area

number

Identifier

Memory area

number

S 1 1 00 . 0

T X

E N Q

S TXS11000

Identifier

Identifier Data Identifier Data

Data

Controller send Controller send

Error data

Controller send

A 1 20 00 . 0

T X

Identifier

N A K

S1 1000.0

T X

Data

Controller re-send

Host computer sendHost computer sendHost computer send

E O T

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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:

Controller send

No response

(6)

A C K

(4)

N A K

(5)

E O T

(1)

Address

(2)

Host computer send

[ ] [ ] [Data]

Identifier

Memory area number

(3)

E T X

[BCC]

5.2.1 Selecting procedures

(1) Data link initialization

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

Host computer send

E O T

(7)

(2) Sending selecting address from the host computer

Host computer sends selecting address for the selecting sequence.

Address

• Multi-point mode

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

• Single mode

This data is for representing the device address and channel number of the controller to be selected. When selecting any identifier without a channel number, that channel number is ignored. Each address is calculated as follows.

Calculation method of address:

Address = Device address of controller + Controller channel number - 1

(2 digits)

For details, see 4.2 Setting the Communication Parameters (P. 9).

Continued on the next page.

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5. RKC COMMUNICATION PROTOCOL

Continued from the previous page.

Example: When 3 controllers (MA900: 4 channels) are multidrop-connected

Device address

of controller

Controller

channel number

Addresses used in selecting sequence

Controller 1 Device address 00 + CH1 - 1 = Address 00

Device address 00 + CH2 - 1 = Address 01 Device address 00 + CH3 - 1 = Address 02 Device address 00 + CH4 - 1 = Address 03

Controller 2 Device address 04 + CH1 - 1 = Address 04

Device address 04 + CH2 - 1 = Address 05 Device address 04 + CH3 - 1 = Address 06 Device address 04 + CH4 - 1 = Address 07

Controller 3 Device address 08 + CH1 - 1 = Address 08

Device address 08 + CH2 - 1 = Address 09 Device address 08 + CH3 - 1 = Address 10 Device address 08 + CH4 - 1 = Address 11

For example, if Address 10 is selected CH3 corresponding to Controller 3 is urged to receive data.

In case of the MA901: Set the device address number of the succeeding controller to eight or more than eight plus the same number of the previous controller.

Controller 1: Device address 00, Controller 2: Device address 08, ..........

As long as the data link is not initialized by sending or receiving EOT, the selecting address once sent becomes valid.

(3) Data sent from the host computer

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

When no memory area number is specified

3.2.

BCCETXIdentifierSTX Data

When the memory area number is specified

3.2.1.

STX Data

For the STX, ETX and BCC, see 5.1 Polling (P. 15).

Memory area

number

BCCETXIdentifier

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5. RKC COMMUNICATION PROTOCOL

1. Memory area number (2 digits) This is the identifier to specify the memory area number. It is expressed by affixing “K” to the head of each memory area number (from 1 to 8). In addition, if the memory area number is assigned with “K0,” this represents that control area is specified.

The memory area now used for control is called “Control area.”

If the memory area number is not specified when selecting the identifier corresponding to the memory area, selecting is made to the memory area.

If any identifier not corresponding to the memory area is assigned with a memory area number, this memory area number is ignored.

2. 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. 34).

3. Data Data which is indicated by an identifier of this controller, consisting of channel numbers, data, etc. It is expressed in decimal ASCII code including a minus sign (-) and a decimal point.

Channel number: 2 digit ASCII code

The channel number can be zero-suppressed. (Channel number: MA900: from 01 to 04, MA901: from 01 to 08) Channels without channel numbers may exist depending on the type identifier. In addition, in case of single mode, do not use the channel number.

Data: ASCII code (The data can be zero-suppressed.)

The number of digits varies depending on the type of identifier.

Data structure of identifier with channel number (Only for multi-point mode)

A data is divided from that of the next channel with a comma.

number

Space

DataChannel

Comma

Channel

number

Space

Data

Comma

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5. RKC COMMUNICATION PROTOCOL

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.

(Number of digits: Within 6 digits)

<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

Receive data

-.5 -.058 .05 -0

-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)

(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.

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5. RKC COMMUNICATION PROTOCOL

(5) NAK (Negative acknowledge)

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.

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5. RKC COMMUNICATION PROTOCOL

5.2.2 Selecting procedure example (Multi-point mode)

(1) When no memory area number is specified

Normal transmission

Host computer send

0 0 S 1

T X

0 1 0 1 0 0 . 0 , 0 2 0 2 0 0 . 0 , 0 3 0 3 0 0 . 0 ,

Device

address

Error transmission

Device

address

Identifier

0 4 0 4 0 0 . 0

0 0 S 1

T X

Identifier

Data

Channel

number

Space

Host computer send

0 1 0 1 0 0 0 , 0 2 0 2 0 0 . 0 , 0 3 0 3 0 0 . 0 ,

Data

Channel

number

Space

Error data

Comma

Channel number

A 1 0

T X

Host computer send

Comma

Channel number

Data

Channel

number

1 ......

Data

Space

Comma

E T X

Controller sendController send

Comma

Host computer sendHost computer send

B C C

E O T

A C K

Continue to *1

0 4 0 4 0 0 . 0

S 1 0 1 ......

T X

A K

Host computer sendHost computer re-sendHost computer send

Controller sendController send

E O T

A C K

IMR01H02-E3

(2) When the memory area number is specified

Normal transmission

Host computer send

5. RKC COMMUNICATION PROTOCOL

0 0 S 1

Device

address

K 1

T X

Memory area

number

0 4 0 4 0 0 . 0

Error transmission

0 1 0 1 0 0 . 0

Identifier

Channel

number

Space

Data

E T X

, 0 2 0 2 0 0 . 0 , 0 3 0 3 0 0 . 0 ,

Data

......

Comma

Controller sendController send

Continue to *1

Host computer sendHost computer sendHost computer send

E O

A C K

Comma

Channel

number

B C C

S T X

K 1 0 1

Space

A 1

0 0 S 1

Device

address

K 1

T X

Memory area

number

0 4 0 4 0 0 . 0

Data

Space

Error data

Comma

Host computer sendHost computer re-sendHost computer send

Controller send

E O

A C K

Host computer send

0 1 1 0 0 . 0 , 0 2 0 2 0 0 0 , 0 3 0 3 0 0 . 0 ,

Identifier

Channel

number

Space

Data

A K

Controller send

Comma

Channel

number

K 1 0 1 ......

T X

S 1

Continue to *1

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5. RKC COMMUNICATION PROTOCOL

(3) Without the channel number

Normal transmission

0 0 T L

T X

0 0

E T X

Host computer sendHost computer sendHost computer send

B C C

I P 00 20 0

T X

0 0 0 0 0

E O

Device

address

Error transmission

Device

address

Identifier

0 0 T L

T X

Identifier

Data

0 0

Data

Error data

A K

Controller send

A C K

Controller sendController send

Host computer sendHost computer re-sendHost computer send

T L 00 20

T X

0 0 0 0 2

Controller send

E O

A C K

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5. RKC COMMUNICATION PROTOCOL

5.2.3 Selecting procedure example (Single mode)

MA900 is used in the procedure example for explanation, but the same setting procedures also apply to MA901.

(1) When no memory area number is specified

Normal transmission

0 0 S 1

T X

1 0 0 . 0 2 0 0 . 00

S T X

A 1 0

Host computer sendHost computer sendHost computer send

E O

Address

Error transmission

Host computer send

Address

Identifier Data

0 0 S 1

T X

Identifier Data

1 0 0 0

Error data

A K

Controller send

Identifier Data

Host computer re-send

S 1 0

T X

Identifier Data

1 0 0 . 0

(2) When the memory area number is specified

Normal transmission

0 0 S 1

K 1

T X

1 0 0 . 0 2 0 0 . 00

S T X

K 1

A 1 0

A C K

Controller sendController send

Host computer send

A C K

Controller send

E O

Host computer sendHost computer sendHost computer send

E O T

Address

Error transmission

Host computer send

0 0 S 1

Address

IMR01H02-E3

Identifier

Memory area

number

K 1 K 1

Identifier Data

Memory area

number

Data

Error data

1 0 0 0 1 0 0 . 00

A K

Controller send Controller send

Identifier Data

Memory area

number

Host computer re-send

S T X

Memory area number

1 0

Identifier

Data

A C K

Controller sendController send

Host computer send

A C K

E O T

5. RKC COMMUNICATION PROTOCOL

5.3 Communication Identifier List

Reference to communication identifier list

!"!"

(1) (2) (3) (4) (5) (6) (7)

Name Iden-

tifier

Model code ID 32 Display the model code ----- RO −

Measured value (PV)

Current transformer 1 input value

Set value (SV) # S1 6 Within input range. 0 or 0.0 R/W ×

(1) Name: A name of identifier is written.

(2) Identifier: The code to identify the data is written. (3) No. of digits: The number of maximum digits is written. (4) Data range: The range of reading or writing data is written. (5) Factory set value: The factory set value of data is written. (6) Attribute: The data accessing direction is written.

(7) CH: ×: Identifier with channel

M1 6 Within input range. ----- RO ×

M2 6 CTL6P: 0.0 to 30.0 A

No. of

digits

CTL12: 0.0 to 100.0 A

The identifier whose name is marked with # indicates that corresponding to the memory area.

RO: Read only (Data direction: Controller → Host computer) R/W: Read and Write (Data direction: Controller ↔ Host computer)

−: Identifier without channel

Data range Factory set

value

----- RO ×

Attri-

bute

Data sending during polling

!"!"

Each time the host computer sends ACK (acknowledgement), the controller sends data corresponding to the respective identifier in the order specified in a list of communication identifiers.

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

To be send in this order.

Name Iden-

tifier

Model code ID 32 Display the model code

Measured value (PV)

Current transformer 1

M1 6 Within input range.

M2 6 CTL6P: 0.0 to 30.0 A

No. of

digits

Data range

CTL12: 0.0 to 100.0 A

IMR01H02-E3

Communication identifier list

!"!"

5. RKC COMMUNICATION PROTOCOL

Name Iden-

Model code

Measured value (PV)

Current transformer 1 input value

Current transformer 2 input value

(This item does not

use in the MA901)

Set value monitor

Burnout

Alarm 1 status

Alarm 2 status

Alarm 3 status

tifier

No. of

digits

Data range Factory set

value

32 Display the model code ----- RO

6 Within input range. ----- RO

6 CTL6P: 0.0 to 30.0 A

----- RO

CTL12: 0.0 to 100.0 A

6 Within input range. ----- RO

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

Attri-

bute

− ×

× × ×

IMR01H02-E3

Continued on the next page.

5. RKC COMMUNICATION PROTOCOL

Continued form the previous page.

Name Iden-

Output status *

tifier

No. of

digits

Data range Factory set

value

6 0 to 2047 ----- RO

Attri-

bute

* The status of each output assigned to the controller is converted to the corresponding decimal data

and then is sent to the host computer. Convert the decimal data sent from the controller to the corresponding binary data (bit image) to confirm the status.

Bit number Assignment terminal Output type Terminal status

b0 OUT1 b1 OUT2 b2 OUT3 Control output b3 OUT4 or b4 OUT5 Alarm output b5 OUT6 0: Open 1: Close b6 OUT7 b7 OUT8 b8 ALM1 b9 ALM2 Alarm output

b10 ALM3

In case of current output (0 to 20 mA DC, 4 to 20 mA DC), these data becomes invalid.

−

Example: Bit images (Decimal number) (Binary number) Open/Close status 1792 = 1 1 1 0 0 0 0 0 0 0 0 Bit number b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

If any defect (welding, etc.) is found in the relay located inside the instrument, the output status may differ from the relay contact status.

Continued on the next page.

IMR01H02-E3

Continued form the previous page.

5. RKC COMMUNICATION PROTOCOL

Name Iden-

Manipulated output value

Cool-side

tifier

O1 6 -5.0 to +105.0 % ----- RO ×

No. of

digits

Data range Factory set

value

Attri-

bute

manipulated output value

(This item does not

use in the MA901)

Error code

DI status

Memory area number selection

ER 1 0 to 5 ----- RO −

L1 6 0 to 31 ----- RO −

ZA 1 1 to 8 1 R/W −

Set value (SV) ! S1 6 Within input range. 0 or 0.0 R/W ×

For heat/cool control: Heat-side manipulated output value

Display the number of the error that occurred.

Example: When the adjusted data error and the A/D conversion error occur simultaneously,

the data is 2. In addition, error contents identify error code displayed on the SV display of MA900/MA901. Error contents: Adjusted data error, EEPROM error, A/D conversion error, Board configuration

error, Watchdog timer error

For the error contents, see the Instruction Manual (IMR01H01-E").

The RUN/STOP terminal and memory area transfer contact input (DI) terminal statuses are

converted to the corresponding decimal data, respectively and then are sent to the host computer. Convert the decimal data sent from the controller to the corresponding binary data (bit image) to confirm the status.

Bit number Input type Terminal status

b0 RUN/STOP terminal status b1 DI1 terminal status b2 DI2 terminal status 0: Open 1: Close b3 DI4 terminal status b4 DI SET terminal status

Example: Bit images (Decimal number) (Binary number) Open/Close status 18 = 1 0 0 1 0 Bit number b4b3b2b1b0

For selecting the memory area, a maximum time of 100 ms is required after selecting is made. If polling is made within 100 ms after selecting is made, the data before selecting is made may be sent to the host side depending on the timing.

Continued on the next page.

IMR01H02-E3

5. RKC COMMUNICATION PROTOCOL

Continued from the previous page.

Name Iden-

Alarm 1 !

Control loop break alarm deadband (LBD) !

tifier

No. of

Data range Factory set

digits

6 Process alarm, SV alarm 1:

Same as input range

Deviation alarm

-span to +span (Within -1999 to +9999 digits) Control loop break alarm (

0.0 to 200.0 minutes (0.0: LBA OFF)

60 to span

However, 9999 digits or less (0: LBD OFF)

LBA

Temperature

50 or 50.0

Voltage input:

Control loop break alarm:

Temperature

input: 0 or 0.0

Voltage input:

value

input:

5.0

8.0

Attri-

bute

R/W

0.0

Alarm 2

6 Process alarm, SV alarm

Same as input range

Deviation alarm

-span to +span (Within -1999 to +9999 digits)

Temperature

R/W

input:

50 or 50.0

Voltage input:

5.0

Heater break alarm 1 (HBA1):

0.0 to 100.0 A (0.0: HBA1 OFF)

Heater break

alarm 2 (HBA2)

(This item does not

use in the MA901)

Process alarm = Process high alarm, Process low alarm, Process high alarm (with hold action),

6 0.0 to 100.0 A

(0.0: HBA2 OFF)

Heater break

alarm 1: 0.0

0.0 R/W

Process high alarm (with hold action) SV alarm = SV high alarm, SV low alarm Deviation alarm = Deviation high alarm, Deviation low alarm, Deviation high/low alarm, Band

alarm, Deviation high alarm (with hold action), Deviation low alarm (with hold

action), Deviation high/low alarm (with hold action)

When the alarm 1 is FAIL alarm, attributes become RO (read only).

When the alarm 1 is other than the control loop break alarm (LBA), attributes become RO (read

only).

When the alarm 2 corresponds to heater break alarm 1 (HBA1), becomes communication data not

corresponding to the memory area.

When there is not alarm 2, attribute becomes RO (read only).

When the alarm 2 is FAIL alarm, attributes become RO (read only).

When the alarm 2 is other than heater break alarm 1 (HBA1), attributes become RO (read only).

Continued on the next page.

IMR01H02-E3

Continued from the previous page.

5. RKC COMMUNICATION PROTOCOL

Name Iden-

Alarm 3 !

Proportional

band

Cool-side proportional band !

(This item does not

use in the MA901)

Integral time !

tifier

No. of

Data range Factory set

digits

6 Process alarm, SV alarm 1:

Same as input range

Deviation alarm

-span to + span (Within -1999 to +9999 digits)

6 0 (0.0) to span

However, 9999 digits or less (0 or 0.0: ON/OFF action)

6 1 to 1000 % of heat-side

proportional band

6 0 to 3600 seconds

(0: PD action)

value

Temperature

input:

50 or 50.0

Voltage input:

5.0

Temperature

input:

30 or 30.0

Voltage input:

3.0

100 R/W

240 R/W

Attri-

bute

R/W

Derivative time !

Anti-reset windup

6 0 to 3600 seconds (0: PI action) 60 R/W

6 0 to 100 % of heat-side

100 R/W proportional band (0: Integral action OFF)

Overlap/

deadband !

(This item does not

use in the MA901)

Process alarm = Process high alarm, Process low alarm, Process high alarm (with hold action),

6 -span to +span

(Within -1999 to +9999 digits)

Temperature

input: 0 or 0.0

Voltage input:

0.0

R/W

Process high alarm (with hold action) SV alarm = SV high alarm, SV low alarm Deviation alarm = Deviation high alarm, Deviation low alarm, Deviation high/low alarm, Band

alarm, Deviation high alarm (with hold action), Deviation low alarm (with hold

action), Deviation high/low alarm (with hold action)

When there is not alarm 3, attribute becomes RO (read only).

When the alarm 3 is FAIL alarm, attributes become RO (read only).

For heat/cool control: Heat-side proportional band

In case of heat control, become RO (read only).

Minus (-) setting results in overlap.

× ×

IMR01H02-E3

Continued on the next page.

5. RKC COMMUNICATION PROTOCOL

Continued from the previous page.

Name Iden-

Setting change rate limiter !

tifier

HH 6 0 (0.0) to span/min.

No. of

digits

Data range Factory set

(0 or 0.0: Setting change rate

Attri-

value

bute

0R/W×

limiter OFF)

Used/unused of channels

RUN/STOP transfer

EI 1 0: Unused

1: Used for only alarm 2: Used for control and alarm

SR 10: STOP

1: RUN

PID/AT selection G1 1 0: PID control

2R/W×

1R/W−

0R/W×

1: Autotuning (AT)

PV bias PB 6 -span to +span

(Within -1999 to +9999 digits)

Temperature input: 0 or 0.0

R/W ×

Voltage input:

Digital filter F1 6 0 to 100 seconds

0R/W×

(0: Digital filter OFF)

Proportioning cycle time

2, 3

T0 6 1 to 100 seconds Relay contact

output: 20

R/W ×

Voltage pulse/ triac output: 2

Cool-side proportioning cycle time

(This item does not

use in the MA901)

T1 6 1 to 100 seconds Relay contact

output: 20 Voltage pulse/ triac output: 2

R/W

Scan interval time TL 6 1 to 10 seconds 2 R/W −

For changing the RUN/STOP, a maximum time of 100 ms is required after selecting is made. If polling is made within 100 ms after selecting is made, the data before selecting is made may be sent to the host side depending on the timing.

Relation with RUN/STOP transfer by DI

The instrument cannot be changed to the RUN by communication, if the instrument is the STOP state by the contact input. (The “STOP” has priority.)

DI state RUN/STOP transfer by communication Instrument state

RUN RUN RUN

RUN/STOP

state

For heat/cool control: Heat-side proportioning cycle time

In case of current output (0 to 20 mA DC, 4 to 20 mA DC), these data becomes invalid.

In case of heat control, become RO (read only).

RUN STOP STOP STOP RUN STOP STOP STOP STOP

Continued on the next page.

IMR01H02-E3

Continued from the previous page.

5. RKC COMMUNICATION PROTOCOL

Name Iden-

Device address

Communication

speed

tifier

No. of

digits

Data range Factory set

value

6 0 to 99 0 R/W

6 0: 2400 bps

2R/W

1: 4800 bps

Attri-

bute

2: 9600 bps 3: 19200 bps

Data bit configuration

Interval time

The value changed becomes effective when the power is turned on again or when changed from

6 See

6 0 to 250 ms 10 R/W

data bit configuration

table

0R/W

STOP to RUN.

Data bit configuration table

Set value Data bit Parity bit Stop bit

0 8 Without 1 1 8 Without 2 28Even1

Setting range of Modbus

3 * 8 Even 2 48Odd1 5 * 8 Odd 2 6 * 7 Without 1

Setting range of RKC communication

7 * 7 Without 2 8 * 7 Even 1

9 * 7 Even 2 10 * 7 Odd 1 11 * 7 Odd 2

* When the Modbus communication protocol selected, this setting becomes invalid.

−

IMR01H02-E3

Continued on the next page.

5. RKC COMMUNICATION PROTOCOL

Continued from the previous page.

Name Iden-

EEPROM storage

mode

tifier

No. of

digits

1 0: Backup mode

(Set values are store to

Data range Factory set

value

0R/W

Attri-

bute

the EEPROM)

1: Buffer mode

(No set values are store to the EEPROM)

EEPROM storage

status

1 0: The content of the EEPROM

does not coincide with that of

----- RO

the memory.

1: The content of the EEPROM

coincides with that of the memory.

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.

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.)

Continued on the next page.

IMR01H02-E3

Continued from the previous page.

5. RKC COMMUNICATION PROTOCOL

Name Iden-

tifier

Lock level 1

Lock level 2

Selection contents of lock level 1

0: Unlock 1: Lock

0000

Least significant digit: Items other than set value (SV) and

Tens digits: Alarms (alarm 1 to alarm 3) Hundreds digits: SV Most significant digit: 0 fixed

Selection contents of lock level 2

0: Unlock 1: Lock

0000

Least significant digit: RUN/STOP transfer Tens digits: Memory area transfer Hundreds digits: 0 fixed Most significant digit: 0 fixed

No. of

digits

6 0000 to 1111

Data range Factory set

value

0000 R/W

alarms (alarm 1 to alarm 3)

Attri-

bute

−

IMR01H02-E3

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. 9). 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. 45).

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. 49), 6.7 Data Configuration (P. 53) and

6.8 Communication Data List (P. 55).

Error check

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

For details, see 6.5 Calculating CRC-16 (P. 47).

IMR01H02-E3

6.2 Function Code

Function code contents

Function code

(Hexadecimal)

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

06H Preset single register Set value (SV), alarm set value, PID constants,

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

10H Preset multiple registers Set value (SV), alarm set value, PID constants,

6. MODBUS COMMUNICATION PROTOCOL

Function Contents

PV bias, etc. (For each word)

PV bias, etc.

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

10H Preset multiple registers 11 255 8 8

6.3 Communication Mode

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

RTU mode

Items Contents

Data bit length 8 bit (Binary)

Start mark of message Unused

End mark of message Unused

Message length See 6.2 Function Code

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.

IMR01H02-E3

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.

• In the response message of the Preset Multiple Resister, the slave returns the slave address, the

function code, starting number and number of holding registers in the multi-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 any address other than 0000H to 02EEH and 1388H to 14A0H are

specified.

(However, no error returns for any address from 03E8H to 0563H. Therefore, do not access any of the above addresses.)

3 When the specified number of data items in the query message exceeds the

maximum number of data items available

4 Self-diagnostic error response

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

(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.

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 hexadecimal 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.

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

The flow chart of CRC-16

!"!"

FFFFH

CRC Register ⊕ next byte of the message

Shift CRC Register right 1 bit

CRC Register

START

Carry flag is

Yes

A001H

⊕

CRC Register

→

0 →

→

+ 1 →

→

CRC Register

> 7

Yes

Is message complete ?

Yes

END

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

IMR01H02-E3

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 (0001H) and 125 (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 E5H

Low 84H

Error response message

Slave address 02H

80H + Function code 83H

Error code 03H

CRC-16 High F1H

Low 31H

Number of holding registers × 2

IMR01H02-E3

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 00C8H of slave address 1.

Query message

Slave address 01H

Function code 06H

Holding register High 00H

number Low C8H

Write data High 00H

Low 64H

CRC-16 High 09H

Low DFH

Any data within the range

Normal response message

Slave address 01H

Function code 06H

Holding register High 00H

number Low C8H

Write data High 00H

Low 64H

CRC-16 High 09H

Low DFH

Error response message

Slave address 01H

80H + Function code 86H

Error code 02H

CRC-16 High C3H

Low A1H

Contents will be the same as query message data.

IMR01H02-E3

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.

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

6.6.4 Preset multiple registers [10H]

The query message specifies the starting register address and quantity of registers to be written. 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 two holding registers from 00C8H to 00C9H of slave address 1.

Query message

Slave address 01H

Function code 10H

Starting number High 00H

Low C8H

Quantity High 00H

Low 02H

Number of data 04H

Data to first High 00H

Data to next High 00H

CRC-16 High BEH

Low 6DH

First holding register address

The setting must be between 1 (0001H) and 100 (0064H).

Number of holding registers × 2

Any data within the range

Normal response message

Slave address 01H

Function code 10H

Starting number High 00H

Low C8H

Quantity High 00H

Low 02H

CRC-16 High C0H

Low 36H

Error response message

Slave address 01H

80H + Function code 90H

Error code 02H

CRC-16 High CDH

Low C1H

IMR01H02-E3

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.

Current transformer 1 input value Cool-side manipulated output value * Current transformer 2 input value * Control loop break alarm (LBA) Manipulated output value or Heater break alarm 1 (HBA1) heat-side manipulated output value Heater break alarm 2 (HBA2) *

* This item does not use in the MA901.

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

!"!"

Burnout Used/unused of channels Alarm 1 status RUN/STOP transfer Alarm 2 status PID/AT selection Alarm 3 status Digital filter Output status Proportioning cycle time or DI status heat-side proportioning cycle time Memory area number selection Cool-side proportional cycle time * Cool-side proportional band * Scan interval time Integral time EEPROM storage mode Derivative time EEPROM storage status Anti-reset windup Lock level 1 Setting change rate limiter Lock level 2

* This item does not use in the MA901.

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

Integral time High 00H

Low 32H

IMR01H02-E3

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. 75).

Measured value (PV) Set value monitor Set value (SV) Alarm 1 (Except the control loop break alarm) Control loop break alarm (LBA) Alarm 2 (Except the heater break alarm 1) Alarm 3 Proportional band or heat-side proportional band Overlap/deadband * PV bias

* This item does not use in the MA901.

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

• Addresses in which data (holding register) is accessible are from 0000H to 02EEH and from 1388H

to 14A0H. If any address other than 0000H to 02EEH and 1388H to 14A0H is accessed, an error response message returns. However, no error returns for any address from 03E8H to 0563H. Therefore, do not access any of the above addresses.

• Read data of unused channel 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.

• Communication data includes data which becomes RO (read only) depending on the specification.

No error occurs even if data is written when set to RO. However in this case, no data is written.

For details, see 6.8 Communication Data List (P. 55).

• Send the next command message at time intervals of 30 bits after the master receives the response

message.

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

6.8 Communication Data List

The communication data list summarizes names, descriptions, factory set values and attributes.

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

The communication data whose name is marked with ! indicates that corresponding to the memory area.

In case of Modbus communication, data are treated as binary data in communication.

Name Data range Factory set value Attri-

bute

Measured value (PV) Within input range. ----- RO

Manipulated output

value

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

Cool-side manipulated output value

(This item does not use in

the MA901.)

Current transformer 1 input value

CTL6P: 0.0 to 30.0 A CTL12: 0.0 to 100.0 A

----- RO

Current transformer 2 input value

(This item does not use in

the MA901.)

STATUS

For heat/cool PID control: Heat-side manipulated output value

The alarms and burnout statuses are converted to the corresponding decimal data, respectively and

0 to 135 ----- RO

then are sent to the host computer. Convert the decimal data sent from the controller to the corresponding binary data (bit image) to confirm the status.

Bit number Details Alarm status

b0 Alarm 1 status b1 Alarm 2 status b2 Burnout status 0: OFF 1: ON

b3 to b6 Unused

b7 Alarm 3 status

b8 to b15 Unused

Example:

Bit images (Decimal number) (Binary number)

OFF/ON status

Bit number

135 = 0 000000010000111

b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

If any defect (welding, etc.) is found in the relay located inside the instrument, the output status may differ from the relay contact status.

IMR01H02-E3

Continued on the next page.

6. MODBUS COMMUNICATION PROTOCOL

Continued form the previous page.

Name Data range Factory set

value

Output status

DI status

The status of each output assigned to the controller is converted to the corresponding decimal data

0 to 2047 ----- RO

0 to 31 ----- RO

Attri-

bute

and then is sent to the host computer. Convert the decimal data sent from the controller to the corresponding binary data (bit image) to confirm the status.

Bit number Assignment terminal Output type Terminal status

b0 OUT1 b1 OUT2 b2 OUT3 Control output b3 OUT4 or b4 OUT5 Alarm output b5 OUT6 0: Open 1: Close b6 OUT7 b7 OUT8 b8 ALM1 b9 ALM2 Alarm output

b10 ALM3 In case of current output (0 to 20 mA DC, 4 to 20 mA DC), these data becomes invalid. Example: Bit images (Decimal number) (Binary number) Open/Close status 1792 = 1 1 1 0 0 0 0 0 0 0 0 Bit number b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0

If any defect (welding, etc.) is found in the relay located inside the instrument, the output status may differ from the relay contact status.

The RUN/STOP terminal and memory area transfer contact input (DI) terminal statuses are

Bit number Input type Terminal status

b0 RUN/STOP terminal status b1 DI1 terminal status b2 DI2 terminal status 0: Open 1: Close b3 DI4 terminal status b4 DI SET terminal status

Example: Bit images (Decimal number) (Binary number) Open/Close status 18 = 1 0 0 1 0 Bit number b4b3b2b1b0

Continued on the next page.

IMR01H02-E3

Continued form the previous page.

Name Data range Factory set

6. MODBUS COMMUNICATION PROTOCOL

Attri-

value

bute

EEPROM storage

status

0: The content of the EEPROM does not

coincide with that of the memory.

----- RO

1: The content of the EEPROM coincides

with that of the memory.

Set value monitor Within input range. ----- RO

Set value (SV) ! Within input range. 0 or 0.0 R/W

PID/AT selection 0: PID control 1: Autotuning (AT) 0 R/W

Proportional band

Cool-side

0 (0.0) to span However, 9999 digits or less

(0 or 0.0: ON/OFF action)

Temperature input:

30 or 30.0

Voltage input: 3.0

R/W

1 to 1000 % of heat-side proportional band 100 R/W

proportional band !

(This item does not use

in the MA901.)

Integral time ! 0 to 3600 seconds (0: PD action) 240 R/W

Derivative time ! 0 to 3600 seconds (0: PI action) 60 R/W

Overlap/deadband !

(This item does not use

in the MA901.)

-span to +span

(Within -1999 to +9999 digits)

Temperature input:

0 or 0.0

Voltage input: 0.0

R/W

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

100 R/W

(0: Integral action OFF)

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.)

For heat/cool control: Heat-side proportional band

In case of heat control, become RO (read only).

Minus (-) setting results in overlap.

Continued on the next page.

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

Continued form the previous page.

Name Data range Factory set

Alarm 1 ! Process alarm, SV alarm 1:

Same as input range

Deviation alarm

: -span to +span

(Within -1999 to +9999 digits)

Control loop break alarm (LBA):

0.0 to 200.0 minutes (0.0: LBA OFF)

Alarm 2

Process alarm, SV alarm 1: Same as input range

Deviation alarm

: -span to +span (Within -1999 to +9999 digits) Heater break alarm 1 (HBA1):

0.0 to 100.0 A (0.0: HBA1 OFF)

Alarm 3 ! Process alarm, SV alarm 1:

Same as input range

Deviation alarm

: -span to +span (Within -1999 to +9999 digits)

Heater break alarm 2 (HBA2)

(This item does not use

in the MA901.)

0.0 to 100.0 A (0.0: HBA2 OFF)

value

Temperature input:

50 or 50.0

Voltage input: 5.0

Control loop break

alarm: 8.0

Temperature input:

50 or 50.0

Voltage input: 5.0

Heater break alarm 1:

0.0

Temperature input:

50 or 50.0

Voltage input: 5.0

0.0 R/W

Attri-

bute

R/W

Used/unused of channels !

0: Unused 1: Used for only alarm

2R/W

2: Used for control and alarm

Process alarm = Process high alarm, Process low alarm, Process high alarm (with hold action),

Process high alarm (with hold action) SV alarm = SV high alarm, SV low alarm Deviation alarm = Deviation high alarm, Deviation low alarm, Deviation high/low alarm, Band

alarm, Deviation high alarm (with hold action), Deviation low alarm (with hold

action), Deviation high/low alarm (with hold action)

When the alarm 1 is FAIL alarm, attributes become RO (read only).

When the alarm 2 corresponds to heater break alarm 1 (HBA1), becomes communication data not

corresponding to the memory area.

When there is not alarm 2, attributes becomes RO (read only).

When the alarm 2 is FAIL alarm, attributes become RO (read only).

When there is not alarm 3, attribute becomes RO (read only).

When the alarm 3 is FAIL alarm, attributes become RO (read only).

When the alarm 2 is other than heater break alarm 1 (HBA1), attributes become RO (read only).

Continued on the next page.

IMR01H02-E3

Continued form the previous page.

6. MODBUS COMMUNICATION PROTOCOL

Name Data range Factory set

Proportioning cycle

1, 2

time

value

1 to 100 seconds Relay contact output:

Attri-

bute

R/W

Voltage pulse/

triac output: 2

Cool-side proportioning cycle

time

(This item does not use

in the MA901.)

Control loop break alarm deadband (LBD)

PV bias -span to +span

1 to 100 seconds Relay contact output:

Voltage pulse/

triac output: 2

0 to span However, 9999 digits or less (0: LBD OFF)

Temperature input:

0 or 0.0

Voltage input: 0.0

Temperature input:

(Within -1999 to +9999 digits)

0 or 0.0

R/W

Voltage input: 0

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

Setting change rate limiter !

RUN/STOP transfer

Memory area number

0 (0.0) to span/min.

0R/W

(0 or 0.0: Setting change rate limiter OFF)

0: STOP 1: RUN 1 R/W

1 to 8 1 R/W

selection

Scan interval time 1 to 10 seconds 2 R/W

Device address

0 to 99 0 R/W

(Slave address)

Communication speed 60: 2400 bps 2: 9600 bps

2R/W

1: 4800 bps 3: 19200 bps

For heat/cool control: Heat-side proportioning cycle time

In case of current output (0 to 20 mA DC, 4 to 20 mA DC), these data becomes invalid.

In case of heat control, become RO (read only).

Become RO (read only) when the alarm 1 is other than control loop break alarm (LBA).

Relation with RUN/STOP transfer by DI The instrument cannot be changed to the “RUN” by communication, if the instrument is the STOP state by the contact input. (The “STOP” has priority.)

DI state RUN/STOP transfer by communication Instrument state

RUN RUN RUN

RUN/STOP

state

The value changed becomes effective when the power is turned on again or when changed from

RUN STOP STOP STOP RUN STOP STOP STOP STOP

STOP to RUN.

Continued on the next page.

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

Continued from the previous page.

Name Data range Factory set

Data bit configuration 1See

Interval time

EEPROM storage

mode

0 to 250 ms 10 R/W

0: Backup mode

data bit configuration table

(Set values are store to the EEPROM)

value

0R/W

Attri-

bute

1: Buffer mode

(No set values are store to the EEPROM)

The value changed becomes effective when the power is turned on again or when changed from

STOP to RUN.

Data bit configuration table

Set value Data bit Parity bit Stop bit

0 8 Without 1 1 8 Without 2 28Even1

Setting range of Modbus

3 * 8 Even 2 48Odd1 5 * 8 Odd 2 6 * 7 Without 1

Setting range of RKC communication

7 * 7 Without 2 8 * 7 Even 1

9 * 7 Even 2 10 * 7 Odd 1 11 * 7 Odd 2

* When the Modbus communication protocol selected, this setting becomes invalid.

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.

Continued on the next page.

IMR01H02-E3

Continued from the previous page.

6. MODBUS COMMUNICATION PROTOCOL

Name Data range Factory set

Lock level 1 0000 to 1111

Lock level 2 0000 to 1111

Selection contents of lock level 1

0: Unlock 1: Lock

0000

Least significant digit: Items other than set value (SV) and

Tens digits: Alarms (alarm 1 to alarm 3) Hundreds digits: SV Most significant digit: 0 fixed

Selection contents of lock level 2

0: Unlock 1: Lock

0000

Least significant digit: RUN/STOP transfer Tens digits: Memory area transfer Hundreds digits: 0 fixed Most significant digit: 0 fixed

Attri-

value

0000 R/W

bute

alarms (alarm 1 to alarm 3)

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

6.9 Data Map

6.9.1 Reference to data map

This data map summarizes the data addresses, channels and names that can be used with Modbus protocol. For details on each data range, see 6.8 Communication Data List (P. 55).

(1)

Address CH Name

0000H ( 0) CH1 0001H ( 1)

0002H ( 2) CH3 0003H ( 3) CH4 0004H ( 4)

⋅

0013H ( 19) 0014H ( 20) CH1 0015H ( 21) CH2 Manipulated output 0016H ( 22) CH3 value * 0017H ( 23) CH4

(1) Address: Data addresses are written in hexadecimal numbers.

Characters in ( ) are decimal numbers.

(2) CH: The channel number of controller

(2)

CH2

Measured value (PV)

Unused



(3)

(3) Name: Data names

IMR01H02-E3

6.9.2 Data map list

MA900 data map

!"!"

(1) Read only data

6. MODBUS COMMUNICATION PROTOCOL

Address CH Name

0000H ( 0) CH1 0001H ( 1) CH2 Measured value (PV) 0002H ( 2) CH3 0003H ( 3) CH4 0004H ( 4)

0013H ( 19) 0014H ( 20) CH1 0015H ( 21) CH2 Manipulated output 0016H ( 22) CH3 value * 0017H ( 23) CH4 0018H ( 24)

0027H ( 39) 0028H ( 40) CH1

0029H ( 41) CH2 Cool-side manipulated 002AH ( 42) CH3 output value 002BH ( 43) CH4 002CH ( 44)

003BH ( 59) 003CH ( 60) CH1 003DH ( 61) CH2 Current transformer 1

003EH ( 62) CH3 input value

003FH ( 63) CH4

0040H ( 64) CH1

0041H ( 65) CH2 Current transformer 2

0042H ( 66) CH3 input value

0043H ( 67) CH4

0044H ( 68)

0063H ( 99)

⋅

0064H ( 100) CH1 0065H ( 101) CH2 STATUS 0066H ( 102) CH3 0067H ( 103) CH4 0068H ( 104)

⋅

0078H ( 120)



Unused

Address CH Name

0079H ( 121)

007AH ( 122)

007BH ( 123)

007CH ( 124)

⋅

008BH ( 139) 008CH ( 140) CH1

008DH ( 141) CH2 Set value monitor

008EH ( 142) CH3 008FH ( 143) CH4 0090H ( 144)

⋅

00C7H ( 199)

* For heat/cool control:

Heat-side manipulated output value.

Output status



DI status



EEPROM storage



status

Unused



Unused



IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

(2) Read/Write data

(Data with channels)

Address CH Name

00C8H ( 200) CH1

00C9H ( 201) CH2 Set value (SV)

00CAH ( 202) CH3 00CBH ( 203) CH4 00CCH ( 204)

⋅



Unused

00DBH ( 219) 00DCH ( 220) CH1

00DDH ( 221) CH2 PID/AT selection

00DEH ( 222) CH3 00DFH ( 223) CH4

00E0H ( 224)

⋅



Unused

00EFH ( 239)

00F0H ( 240) CH1 Proportional band 00F1H ( 241) CH2 00F2H ( 242) CH3 00F3H ( 243) CH4 00F4H ( 244)

⋅

For heat/cool control:

Heat-side proportional band

Unused



0103H ( 259) 0104H ( 260) CH1 0105H ( 261) CH2 Cool-side 0106H ( 262) CH3 proportional band 0107H ( 263) CH4 0108H ( 264)

⋅



Unused

0117H ( 279) 0118H ( 280) CH1

0119H ( 281) CH2 Integral time 011AH ( 282) CH3 011BH ( 283) CH4 011CH ( 284)

⋅



Unused

012BH ( 299) 012CH ( 300) CH1 012DH ( 301) CH2 Derivative time

012EH ( 302) CH3

012FH ( 303) CH4

0130H ( 304)

⋅



Unused

013FH ( 319)

Address CH Name

0140H ( 320) CH1 0141H ( 321) CH2 Overlap/deadband 0142H ( 322) CH3 0143H ( 323) CH4 0144H ( 324)

⋅



Unused

0153H ( 339) 0154H ( 340) CH1 0155H ( 341) CH2 Anti-reset windup 0156H ( 342) CH3 0157H ( 343) CH4 0158H ( 344)

⋅



Unused

0167H ( 359) 0168H ( 360) CH1 0169H ( 361) CH2 Alarm 1

016AH ( 362) CH3

016BH ( 363) CH4 016CH ( 364)

⋅



Unused

017BH ( 379) 017CH ( 380) CH1

017DH ( 381) CH2 Alarm 2

017EH ( 382) CH3 017FH ( 383) CH4 0180H ( 384)

⋅



Unused

018FH ( 399) 0190H ( 400) CH1 0191H ( 401) CH2 Alarm 3 0192H ( 402) CH3 0193H ( 403) CH4 0194H ( 404)

⋅



Unused

01A3H ( 419) 01A4H ( 420) CH1 01A5H ( 421) CH2 Heater break alarm 2 01A6H ( 422) CH3 01A7H ( 423) CH4 01A8H ( 424)

⋅



Unused

01B7H ( 439)

Continued on the next page.

IMR01H02-E3

Continued form the previous page.

Address CH Name

01B8H ( 440) CH1 01B9H ( 441) CH2 Used/unused of

01BAH ( 442) CH3 channels 01BBH ( 443) CH4 01BCH ( 444)

⋅



Unused

01CBH ( 459) 01CCH ( 460) CH1 01CDH ( 461) CH2 Proportioning cycle 01CEH ( 462) CH3 time *

01CFH ( 463) CH4 01D0H ( 464)

⋅



Unused

01DFH ( 479)

01E0H ( 480) CH1 Cool-side

01E1H ( 481) CH2 proportioning cycle

01E2H ( 482) CH3 time

01E3H ( 483) CH4

01E4H ( 484)

⋅



Unused

0243H ( 579)

0244H ( 580) CH1

0245H ( 581) CH2 Control loop break

0246H ( 582) CH3 alarm deadband (LBD)

0247H ( 583) CH4

0248H ( 584)

⋅



Unused

0257H ( 599)

0258H ( 600) CH1

0259H ( 601) CH2 PV bias 025AH ( 602) CH3 025BH ( 603) CH4 025CH ( 604)

⋅



Unused

0293H ( 659)

0294H ( 660) CH1

0295H ( 661) CH2 Digital filter

0296H ( 662) CH3

0297H ( 663) CH4

0298H ( 664)

⋅



Unused

02A7H ( 679)

6. MODBUS COMMUNICATION PROTOCOL

Address CH Name

02A8H ( 680) CH1 02A9H ( 681) CH2 Setting change rate

02AAH ( 682) CH3 limiter

02ABH ( 683) CH4 02ACH ( 684)

⋅



Unused

02BBH ( 699)

* For heat/cool control:

Heat-side proportioning cycle time

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

(3) Read/Write data

(Data without channel)

Address CH Name

02BCH ( 700) 02BDH ( 701)

02BEH ( 702)

⋅

02CFH ( 719) 02D0H ( 720) 02D1H ( 721) 02D2H ( 722) 02D3H ( 723) 02D4H ( 724) 02D5H ( 725)

02D6H ( 726) 02D7H ( 727) 02D8H ( 728)

⋅

02EEH ( 750)

RUN/STOP transfer



Memory area number



selection

Unused



Scan interval time



Device address



Communication speed



Data bit configuration



Interval time



EEPROM storage



mode Lock level 1



Lock level 2



Unused



IMR01H02-E3

(4) Read/Write data

(Data corresponding to memory area)

6. MODBUS COMMUNICATION PROTOCOL

Address CH Name

1388H (5000)

Memory area number



selection

1389H (5001) CH1

138AH (5002) CH2 Set value (SV) 138BH (5003) CH3 138CH (5004) CH4 138DH (5005)

⋅



Unused

139CH (5020) 139DH (5021) CH1 Proportional band

139EH (5022) CH2

139FH (5023) CH3 13A0H (5024) CH4 13A1H (5025)

⋅

For heat/cool control:

Heat-side proportional band

Unused



13B0H (5040) 13B1H (5041) CH1 13B2H (5042) CH2 Integral time 13B3H (5043) CH3 13B4H (5044) CH4 13B5H (5045)

⋅



Unused

13C4H (5060) 13C5H (5061) CH1 13C6H (5062) CH2 Derivative time 13C7H (5063) CH3 13C8H (5064) CH4 13C9H (5065)

⋅



Unused

13D8H (5080) 13D9H (5081) CH1

13DAH (5082) CH2 Anti-reset windup 13DBH (5083) CH3 13DCH (5084) CH4 13DDH (5085)

⋅



Unused

13ECH (5100)

13EDH (5101) CH1

13EEH (5102) CH2 Setting change rate 13EFH (5103) CH3 limiter

13F0H (5104) CH4

Address CH Name

13F1H (5105)

⋅



Unused

1400H (5120) 1401H (5121) CH1 1402H (5122) CH2 Used/unused of 1403H (5123) CH3 channels 1404H (5124) CH4 1405H (5125)

⋅



Unused

1414H (5140) 1415H (5141) CH1 1416H (5142) CH2 Cool-side 1417H (5143) CH3 proportional band 1418H (5144) CH4 1419H (5145)

⋅



Unused

1428H (5160) 1429H (5161) CH1

142AH (5162) CH2 Overlap/deadband

142BH (5163) CH3 142CH (5164) CH4

142DH (5165)

⋅



Unused

143CH (5180)

143DH (5181) CH1

143EH (5182) CH2 Alarm 1 143FH (5183) CH3

1440H (5184) CH4 1441H (5185)

⋅



Unused

1450H (5200) 1451H (5201) CH1 1452H (5202) CH2 Control loop break 1453H (5203) CH3 alarm deadband (LBD) 1454H (5204) CH4 1455H (5205)

⋅



Unused

1464H (5220)

Continued on the next page.

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

Continued form the previous page.

Address CH Name

1465H (5221) CH1 1466H (5222) CH2 Alarm 2 1467H (5223) CH3 1468H (5224) CH4 1469H (5225)

⋅



Unused

148CH (5260) 148DH (5261) CH1

148EH (5262) CH2 Alarm 3

148FH (5263) CH3

1490H (5264) CH4 1491H (5265)

⋅



Unused

14A0H (5280)

The accessible data (holding register) address range is from 0000H to 02EEH and 1388H to 14A0H. Addresses in which data (holding register) is accessible are from 0000H to 02EEH and from 1388H to 14A0H. If any address other than 0000H to 02EEH and 1388H to 14A0H is accessed, an error response message (error code: 2) returns. However, no error returns for any address from 03E8H to 0563H. Therefore, do not access any of the above addresses.

IMR01H02-E3

MA901 data map

!"!"

(1) Read only data

6. MODBUS COMMUNICATION PROTOCOL

Address CH Name

0000H ( 0) CH1 0001H ( 1) CH2 0002H ( 2) CH3 0003H ( 3) CH4 Measured value (PV) 0004H ( 4) CH5 0005H ( 5) CH6 0006H ( 6) CH7 0007H ( 7) CH8 0008H ( 8)

0013H ( 19) 0014H ( 20) CH1 0015H ( 21) CH2 0016H ( 22) CH3 0017H ( 23) CH4 Manipulated output 0018H ( 24) CH5 value

0019H ( 25) CH6 001AH ( 26) CH7 001BH ( 27) CH8 001CH ( 28)

003BH ( 59) 003CH ( 60) CH1 003DH ( 61) CH2

003EH ( 62) CH3 003FH ( 63) CH4 Current transformer 1

0040H ( 64) CH5 input value

0041H ( 65) CH6

0042H ( 66) CH7

0043H ( 67) CH8

0044H ( 68)

0063H ( 99)

006AH ( 106) CH7

006BH ( 107) CH8

⋅

0064H ( 100) CH1 0065H ( 101) CH2 0066H ( 102) CH3 0067H ( 103) CH4 STATUS 0068H ( 104) CH5 0069H ( 105) CH6



Unused

Address CH Name

006CH ( 108)

⋅

0078H ( 120) 0079H ( 121)

007AH ( 122)

007BH ( 123)

007CH ( 124)

⋅

008BH ( 139) 008CH ( 140) CH1

008DH ( 141) CH2

008EH ( 142) CH3 008FH ( 143) CH4 Set value monitor

0090H ( 144) CH5 0091H ( 145) CH6 0092H ( 146) CH7 0093H ( 147) CH8 0094H ( 148)

⋅

00C7H ( 199)

Unused



Output status



DI status



EEPROM storage



status

Unused



Unused



IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

(2) Read/Write data

(Data with channels)

Address CH Name

00C8H ( 200) CH1

00C9H ( 201) CH2

00CAH ( 202) CH3 00CBH ( 203) CH4 Set value (SV) 00CCH ( 204) CH5 00CDH ( 205) CH6 00CEH ( 206) CH7

00CFH ( 207) CH8

00D0H ( 208)

⋅



Unused

00DBH ( 219) 00DCH ( 220) CH1

00DDH ( 221) CH2

00DEH ( 222) CH3 00DFH ( 223) CH4 PID/AT selection

00E0H ( 224) CH5 00E1H ( 225) CH6 00E2H ( 226) CH7 00E3H ( 227) CH8 00E4H ( 228)

⋅



Unused

00EFH ( 239)

00F0H ( 240) CH1 00F1H ( 241) CH2 00F2H ( 242) CH3 00F3H ( 243) CH4 Proportional band 00F4H ( 244) CH5 00F5H ( 245) CH6 00F6H ( 246) CH7 00F7H ( 247) CH8 00F8H ( 248)

⋅



Unused

0117H ( 279) 0118H ( 280) CH1

0119H ( 281) CH2 011AH ( 282) CH3 011BH ( 283) CH4 Integral time 011CH ( 284) CH5 011DH ( 285) CH6

011EH ( 286) CH7

011FH ( 287) CH8

0120H ( 288)

⋅



Unused

012BH ( 299)

Address CH Name

012CH ( 300) CH1

012DH ( 301) CH2

012EH ( 302) CH3 012FH ( 303) CH4 Derivative time 0130H ( 304) CH5 0131H ( 305) CH6 0132H ( 306) CH7 0133H ( 307) CH8

0134H (308)

⋅



Unused

0153H ( 339) 0154H ( 340) CH1 0155H ( 341) CH2 0156H ( 342) CH3 0157H ( 343) CH4 Anti-reset windup 0158H ( 344) CH5 0159H ( 345) CH6

015AH ( 346) CH7

015BH ( 347) CH8 015CH ( 348)

⋅



Unused

0167H ( 359) 0168H ( 360) CH1 0169H ( 361) CH2

016AH ( 362) CH3

016BH ( 363) CH4 Alarm 1 016CH ( 364) CH5

016DH ( 365) CH6

016EH ( 366) CH7 016FH ( 367) CH8 0170H ( 368)

⋅



Unused

017BH ( 379) 017CH ( 380) CH1

017DH ( 381) CH2

017EH ( 382) CH3 017FH ( 383) CH4 Alarm 2 0180H ( 384) CH5 0181H ( 385) CH6 0182H ( 386) CH7 0183H ( 387) CH8

Continued on the next page.

IMR01H02-E3

Continued from the previous page.

6. MODBUS COMMUNICATION PROTOCOL

Address CH Name

0184H ( 388)

⋅



Unused

018FH ( 399)

0190H ( 400) CH1

0191H ( 401) CH2

0192H ( 402) CH3

0193H ( 403) CH4 Alarm 3

0194H ( 404) CH5

0195H ( 405) CH6

0196H ( 406) CH7

0197H ( 407) CH8

0198H ( 408)

⋅



Unused

01B7H ( 439) 01B8H ( 440) CH1 01B9H ( 441) CH2

01BAH ( 442) CH3 01BBH ( 443) CH4 Used/unused of 01BCH ( 444) CH5 channels 01BDH ( 445) CH6 01BEH ( 446) CH7

01BFH ( 447) CH8 01C0H ( 448)

⋅



Unused

01CBH ( 459) 01CCH ( 460) CH1 01CDH ( 461) CH2 01CEH ( 462) CH3

01CFH ( 463) CH4 Proportioning cycle 01D0H ( 464) CH5 time 01D1H ( 465) CH6 01D2H ( 466) CH7 01D3H ( 467) CH8 01D4H ( 468)

⋅



Unused

0243H ( 579)

0244H ( 580) CH1

0245H ( 581) CH2

0246H ( 582) CH3

0247H ( 583) CH4 Control loop break

0248H ( 584) CH5 alarm deadband (LBD)

0249H ( 585) CH6 024AH ( 586) CH7 024BH ( 587) CH8

Address CH Name

024CH ( 588)

⋅



Unused

0257H ( 599) 0258H ( 600) CH1 0259H ( 601) CH2

025AH ( 602) CH3

025BH ( 603) CH4 PV bias 025CH ( 604) CH5

025DH ( 605) CH6

025EH ( 606) CH7 025FH ( 607) CH8 0260H ( 608)

⋅



Unused

0293H ( 659) 0294H ( 660) CH1 0295H ( 661) CH2 0296H ( 662) CH3 0297H ( 663) CH4 Digital filter 0298H ( 664) CH5 0299H ( 665) CH6

029AH ( 666) CH7

029BH ( 667) CH8 029CH ( 668)

⋅



Unused

02A7H ( 679) 02A8H ( 680) CH1 02A9H ( 681) CH2

02AAH ( 682) CH3

02ABH ( 683) CH4 Setting change rate 02ACH ( 684) CH5 limiter

02ADH ( 685) CH6

02AEH ( 686) CH7

02AFH ( 687) CH8

02B0H ( 688)

⋅



Unused

02BBH ( 699)

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

(3) Read/Write data

(Data without channel)

Address CH Name

02BCH ( 700) 02BDH ( 701)

02BEH ( 702)

⋅

02CFH ( 719) 02D0H ( 720) 02D1H ( 721) 02D2H ( 722) 02D3H ( 723) 02D4H ( 724) 02D5H ( 725)

02D6H ( 726) 02D7H ( 727) 02D8H ( 728)

⋅

02EEH ( 750)

RUN/STOP transfer



Memory area number



selection

Unused



Scan interval time



Device address



Communication speed



Data bit configuration



Interval time



EEPROM storage



mode Lock level 1



Lock level 2



Unused



IMR01H02-E3

(4) Read/Write data

(Data corresponding to memory area)

6. MODBUS COMMUNICATION PROTOCOL

Address CH Name

1388H (5000)

Memory area number



selection

1389H (5001) CH1

138AH (5002) CH2 138BH (5003) CH3 138CH (5004) CH4 Set value (SV) 138DH (5005) CH5

138EH (5006) CH6 138FH (5007) CH7

1390H (5008) CH8 1391H (5009)

⋅



Unused

139CH (5020) 139DH (5021) CH1

139EH (5022) CH2

139FH (5023) CH3 13A0H (5024) CH4 Proportional band 13A1H (5025) CH5 13A2H (5026) CH6 13A3H (5027) CH7 13A4H (5028) CH8 13A5H (5029)

⋅



Unused

13B0H (5040) 13B1H (5041) CH1 13B2H (5042) CH2 13B3H (5043) CH3 13B4H (5044) CH4 Integral time 13B5H (5045) CH5 13B6H (5046) CH6 13B7H (5047) CH7 13B8H (5048) CH8 13B9H (5049)

⋅



Unused

13C4H (5060) 13B9H (5049)

⋅



Unused

13C4H (5060)

Address CH Name

13C5H (5061) CH1 13C6H (5062) CH2 13C7H (5063) CH3 13C8H (5064) CH4 Derivative time

13C9H (5065) CH5 13CAH (5066) CH6 13CBH (5067) CH7 13CCH (5068) CH8 13CDH (5069)

⋅



Unused

13D8H (5080) 13D9H (5081) CH1

13DAH (5082) CH2

13DBH (5083) CH3 13DCH (5084) CH4 Anti-reset windup

13DDH (5085) CH5

13DEH (5086) CH6 13DFH (5087) CH7

13E0H (5088) CH8

13E1H (5089)

⋅



Unused

13ECH (5100) 13EDH (5101) CH1 13EEH (5102) CH2

13EFH (5103) CH3

13F0H (5104) CH4 Setting change rate

13F1H (5105) CH5 limiter

13F2H (5106) CH6

13F3H (5107) CH7

13F4H (5108) CH8

13F5H (5109)

⋅



Unused

1400H (5120)

Continued on the next page.

IMR01H02-E3

6. MODBUS COMMUNICATION PROTOCOL

Continued from the previous page.

Address CH Name

1401H (5121) CH1 1402H (5122) CH2 1403H (5123) CH3 1404H (5124) CH4 Used/unused of 1405H (5125) CH5 channels 1406H (5126) CH6 1407H (5127) CH7 1408H (5128) CH8 1409H (5129)

⋅



Unused

143CH (5180) 143DH (5181) CH1

143EH (5182) CH2 143FH (5183) CH3

1440H (5184) CH4 Alarm 1 1441H (5185) CH5 1442H (5186) CH6 1443H (5187) CH7 1444H (5188) CH8 1445H (5189)

⋅



Unused

1450H (5200) 1451H (5201) CH1 1452H (5202) CH2 1453H (5203) CH3 1454H (5204) CH4 Control loop break 1455H (5205) CH5 alarm deadband (LBD) 1456H (5206) CH6 1457H (5207) CH7 1458H (5208) CH8 1459H (5209)

⋅



Unused

1464H (5220)

Address CH Name

1465H (5221) CH1 1466H (5222) CH2 1467H (5223) CH3 1468H (5224) CH4 Alarm 2 1469H (5225) CH5

146AH (5226) CH6

146BH (5227) CH7

146CH (5228) CH8 146DH (5229)

⋅



Unused

148CH (5260) 148DH (5261) CH1

148EH (5262) CH2

148FH (5263) CH3

1490H (5264) CH4 Alarm 3 1491H (5265) CH5 1492H (5266) CH6 1493H (5267) CH7 1494H (5268) CH8 1495H (5269)

⋅



Unused

14A0H (5280)

IMR01H02-E3

7. INPUT RANGE TABLES

Input Range Table 1

Input type Input range Code

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

Thermocouple

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

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 *

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

IMR01H02-E3

Continued on the next page.

7. INPUT RANGE TABLES

Continued from the previous page.

Input type Input range Code

-199.9 to +999.9 °F

Thermocouple B

-199.9 to +400.0 °C

-199.9 to +100.0 °C

-100.0 to +200.0 °C

-199.9 to +752.0 °F

-100.0 to +200.0 °F

-100.0 to +400.0 °F

Accuracy is not guaranteed between

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

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

0 to 800 °F 0 to 1600 °F 0 to 2192 °F

0 to 400 °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

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 800.0 °C 0 to 2300 °F 0 to 2372 °F

0.0 to 999.9 °F

0.0 to 350.0 °C

0.0 to 450.0 °F

0.0 to 752.0 °F

Input Range

JA1 JA2 JA3 JA6

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.

IMR01H02-E3

Continued from the previous page.

Input type Input range Code

7. INPUT RANGE TABLES

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

IMR01H02-E3

Continued on the next page.

7. INPUT RANGE TABLES

Continued from the previous page.

Input type Input range Code

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 0.0 to 100.0 % 5 01

1 to 5 V DC 6 01

P01 P02 P03 P04 P05 P06 P07 P08 P09 P10

IMR01H02-E3

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

IMR01H02-E3

Wrong address setting

Continued on the next page.

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

IMR01H02-E3

Modbus

!"!"

Problem Probable cause Solution

8. TROUBLESHOOTING

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 any address other than 0000H to

02EEH and 1388H to 14A0H are specified (However, no error returns for any address from 03E8H to 0563H. Therefore, do not access any of the above addresses.)

Error code3When 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.

IMR01H02-E3

ASCII 7-BIT CODE TABLE

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

IMR01H02-E3

The first edition: MAY 2001 The third edition: MAR. 2002 [IMQ00]

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)

IMR01H02-E3 MAR. 2002

RKC MA901 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

1. OUTLINE

3. WIRING

4. SETTING

4.1 Transfer to Setup 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 (Multi-point mode)

5.1.3 Polling procedure example (Single mode)

5.2 Selecting

5.2.1 Selecting procedures

5.2.2 Selecting procedure example (Multi-point mode)

5.2.3 Selecting procedure example (Single mode)

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]

6.6.4 Preset multiple registers [10H]

6.7 Data Configuration

6.7.1 Data range

6.7.2 Data processing precautions

6.8 Communication Data List

6.9.1 Reference to data map

6.9.2 Data map list

7. INPUT RANGE TABLES

ASCII 7-BIT CODE TABLE