RKC INSTRUMENT SRZ Communication Instruction Manual

Communication Extension

Module

Z

-

CO

M

Host Communication

Instruction Manual

Module Type Controller SRZ

IMS01T23-E4

RKC INSTRUMENT INC.

®



 Modbus is a registered trademark of Schneider Electric.

 The name of each programmable controller (PLC) means the products of each manufacturer.

 Company names and product names used in this manual are the trademarks or registered trademarks of

the respective companies.

IMS01T23-E4

i-1

Thank you for purchasing this RKC product. In order to achieve maximum performance and ensure proper

operation of the instrument, carefully read all the instructions in this manual. Please place the manual in a

convenient location for easy reference.

SYMBOLS

: 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.

 To prevent injury to persons, damage to the instrument and the equipment, a

suitable external protection device shall be required.

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

shock, fire or damage to the instrument and the equipment.

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

fire or damage to the instrument and the 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 may occur and

warranty is void under these conditions.

: 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.

WARNING

!

CAUTION

WARNING

!

IMS01T23-E4

i-2

 This product is intended for use with industrial machines, test and measuring equipment.

(It is not designed for use with medical equipment and nuclear energy plant.)

 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 additional 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 to operating personnel.



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

equipment.

 If the equipment is used in a manner not specified by the manufacturer, the protection

provided by the equipment may be impaired.

 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 as a result of failure, protect the power line and the

input/output lines from high currents with a suitable overcurrent protection device with

adequate breaking capacity such as a fuse, circuit breaker, etc.



A malfunction in this product may occasionally make control operations impossible or prevent

alarm outputs, resulting in a possible hazard. Take appropriate measures in the end use to

prevent hazards in the event of malfunction.

 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 dissipation.

 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 may occur. Use a soft, dry cloth to remove stains from the instrument.

 To avoid damage to the instrument display, do not rub with an abrasive material or push the

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 explanation purpose.

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

instrument failure or indirect damage.

 RKC is not responsible for any damage and/or injury resulting from the use of instruments made by

imitating this instrument.

 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.

CAUTION

IMS01T23-E4 i-3

CONTENTS

Page

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

2. COMMUNICATION SPECIFICATION .................................. 2

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

3.1 When Connected with RS-422A ...................................................................... 5

 When the interface of host computer is RS-232C ........................................................... 6

 When the interface of host computer is RS-422A............................................................ 7

 When the host computer has a USB connector .............................................................. 8

3.2 When Connected with RS-485 ........................................................................ 9

 When the interface of host computer is RS-232C ......................................................... 10

 When the interface of host computer is RS-485 ............................................................ 11

 When the host computer has a USB connector ............................................................ 12

3.3 Multiple SRZ Unit Connections ...................................................................... 13

3.4 Termination Resistor of Z-COM Module ........................................................ 14

3.5 Connections for Loader Communication ....................................................... 15

4. COMMUNICATION SETTING ............................................ 16

4.1 Communication Setting of Z-COM Module .................................................... 16

4.1.1 Address setting ........................................................................................................ 16

4.1.2 Communication speed and Communication protocol setting by DIP switch ............. 17

4.1.3 Communication speed and Communication protocol setting via Host communication .. 19

4.1.4 Communication setting for Loader communication .................................................. 21

4.2 Communication Setting of the Function Modules .......................................... 22

4.2.1 Address setting of the function modules .................................................................. 22

4.2.2 Channel of the SRZ unit ........................................................................................... 23

5. COMMUNICATION REQUIREMENTS ............................... 24

6. RKC COMMUNICATION .................................................... 26

6.1 Polling ............................................................................................................ 26

6.1.1 Polling procedures ................................................................................................... 27

6.1.2 Polling procedure example (when the host computer sends data) ............................... 31

6.2 Selecting ........................................................................................................ 32

6.2.1 Selecting procedures ............................................................................................... 32

6.2.2 Selecting procedure example (when the host computer sends data) ........................... 36

IMS01T23-E4

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Page

6.3 Communication Data Structure ...................................................................... 37

6.4 Channel Number of Communication .............................................................. 39

7. MODBUS............................................................................. 42

7.1 Message Format ............................................................................................ 42

7.2 Function Code ............................................................................................... 43

7.3 Communication Mode .................................................................................... 43

7.4 Slave Responses ........................................................................................... 44

7.5 Calculating CRC-16 ....................................................................................... 45

7.6 Register Read and Write ............................................................................... 48

7.6.1 Read holding registers [03H] .................................................................................... 48

7.6.2 Preset single register [06H] ...................................................................................... 49

7.6.3 Diagnostics (Loopback test) [08H] ........................................................................... 50

7.6.4 Preset multiple registers [10H] ................................................................................. 51

7.7 Data Processing Precautions ........................................................................ 52

7.8 How to Use Memory Area Data ..................................................................... 53

8. COMMUNICATION DATA LIST ......................................... 57

8.1 Reference to Communication Data List ......................................................... 57

8.2 Communication Data of Z-COM Module ........................................................ 59

8.3 Communication Data of Z-TIO Module .......................................................... 64

8.4 Communication Data of Z-DIO Module .......................................................... 87

8.5 Communication Data of Z-CT Module ........................................................... 92

8.6 Memory Area Data Address (Z-TIO Module) ................................................. 95

9. COMMUNICATION DATA DESCRIPTION OF

Z-COM MODULE ............................................................... 97

9.1 Reference to Communication Data Contents ................................................ 97

9.2 Communication Data of Z-COM Module ........................................................ 98

APPENDIX ............................................................................ 118

A.1 Parameters to Be Unused by Setting Change............................................. 118

A.2 Parameters to Be Unused Are Based on the Model Code at Ordering ......... 119

IMS01T23-E4 1

1. OUTLINE

The Z-COM module interfaces with the host computer via Modbus or RKC communication protocols.

The communication interface used for both protocols is RS-422A and RS-485.

The following two communication systems of Z-COM module are available.

 Communication 1 (COM. PORT1, COM. PORT2)

 Communication 2 (COM. PORT3, COM.PORT4)

Both communication 1 and communication 2 are available as Host communication.

Z-COM module internal block diagram

COM

Communication 1

COM. PORT1

Communication 2

Host communication

COM. PORT2

COM. PORT3

COM. PORT4

There is isolation between

“Communication 1” and

“Communication 2.”

PLC communication or

Host communication

COM. PORT

Usage 1 Usage 2

Communication 1

COM. PORT1

Host

communication

Host

communication

COM. PORT2

Communication 2

COM. PORT3

PLC

communication

Host

communication

COM. PORT4

For PLC communication, refer to Z-COM Instruction Manual (IMS01T22-E).

 Usage example (When both communication 1 and communication 2 are Host communication.)

Host computer

RS-232C

Host communication

(RKC communication)

RS-232C/

RS-422A

converter

RS-422A

Up to 16 SRZ units can be multi-drop connected

to one host computer (or operation panel)

communication port.

Number of temperature control:

1024 channels maximum

RS-422A

Host communication

(Modbus)

Operation panel

SRZ unit 1

(Unit address 0)

SRZ unit 2

(Unit address 1)

SRZ unit 16

(Unit address 15 [F])

For configuration of SRZ unit, refer to Z-COM Instruction Manual (IMS01T22-E).

2 IMS01T23-E4

2. COMMUNICATION SPECIFICATION

 RKC communication

Interface: Communication 1 (COM. PORT1/2):

Based on EIA, RS-422A standard

Based on EIA, RS-485 standard

Communication 2 (COM. PORT3/4):

Based on EIA, RS-422A standard

Based on EIA, RS-485 standard

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

RS-485 2-wire system, half-duplex multi-drop connection

Synchronous method: Start/Stop synchronous type

Communication speed: 4800 bps, 9600 bps, 19200 bps, 38400 bps

Data bit configuration: Start bit: 1

Data bit: 7 or 8

Parity bit: Without, Odd or Even

Stop bit: 1

Protocol: Based on ANSI X3.28-1976 subcategories 2.5 and B1

Polling/Selecting type

Error control: Vertical parity (with parity bit selected)

Horizontal parity (BCC check)

Data types: ASCII 7-bit code

Interval time: 0 to 250 ms

Maximum connections: 16 SRZ units per communication port of host computer

(Up to one Z-COM module can be connected to one SRZ unit)

2. COMMUNICATION SPECIFICATION

IMS01T23-E4

3

 Modbus

Interface: Communication 1 (COM. PORT1/2):

Based on EIA, RS-422A standard

Based on EIA, RS-485 standard

Communication 2 (COM. PORT3/4):

Based on EIA, RS-422A standard

Based on EIA, RS-485 standard

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

RS-485 2-wire system, half-duplex multi-drop connection

Synchronous method: Start/Stop synchronous type

Communication speed: 4800 bps, 9600 bps, 19200 bps, 38400 bps

Data bit configuration: Start bit: 1

Data bit: 8

Parity bit: Without, Odd or Even

Stop bit: 1

Protocol: Modbus

Signal transmission mode: Remote Terminal Unit (RTU) mode

Function codes: 03H Read holding registers

06H Preset single register

08H Diagnostics (loopback test)

10H Preset multiple registers

Error check method: CRC-16

Error codes: 1: Function code error

(An unsupported function code was specified)

2: When the mismatched address is specified.

3:  When the data written exceeds the setting range.

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

the maximum number of data items available

4: Self-diagnostic error response

Interval time: 0 to 250 ms

Maximum connections: 16 SRZ units per communication port of host computer

(Up to one Z-COM module can be connected to one SRZ unit)

4 IMS01T23-E4

3. WIRING

 To avoid noise induction, keep communication signal wire away from instrument power line,

load lines and power lines of other electric equipment.

 Connect connectors correctly in the right position. If it is forcibly pushed in with pins in the

wrong positions, the pins may be bent resulting in instrument failure.

 When connecting or disconnecting the connectors, do not force it too far to right and left or

up and down, but move it on the straight. Otherwise, the connector pins may be bent,

causing instrument failure.

 When disconnecting a connector, hold it by the connector itself. Disconnecting connectors

by yanking on their cables can cause breakdowns.

 To prevent malfunction, never touch the contact section of a connector with bare hands or

with hands soiled with oil or the like.

 To prevent malfunction, connect cable connectors securely, then firmly tighten the

connector fastening screws.

 To prevent damage to cables, do not bend cables over with excessive force.

 If the instrument is easily affected by noise, use the ferrite core in the both ends of the

communication cable (nearest the connector).

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

connecting or disconnecting the instrument and peripheral equipment.

WARNING

!

CAUTION

3. WIRING

IMS01T23-E4 5

3.1 When Connected with RS-422A

Customer is requested to prepare a communication cable fit for the SRZ unit to be connected by the host

computer.

 Pin layout of modular connector

The contents of the modular connector signal are all the same from COM. PORT1 to COM. PORT4.

COM. PORT1

Communication 2

Communication 1

COM. PORT2

COM. PORT3

COM. PORT4

COM

Modular connector pin number

(RS-422A)

1 R (A)

2 R (B)

3 SG

4 T (B)

5 T (A)

6 SG

Communication

port

 Connector pin number and signal details

Pin No. Signal name Symbol

1

Receive data R (A)

2

Receive data R (B)

3

Signal ground SG

4

Send data T (B)

5

Send data T (A)

6

Signal ground SG

The 6-pin type modular connector should be used for the connection to the Z-COM module.

Recommended model: TM4P-66P (Manufactured by HIROSE ELECTRIC CO., LTD.)

3. WIRING

IMS01T23-E4

6

 When the interface of host computer is RS-232C

COM

Communication cable

(W-BF-02)

Connect to the communication connector

Host computer

RS-232C

Connect to the

COM. PORT1

RS-422A

Connect to the

COM. PORT2

RS-232C/RS-422A converter

COM-A (RKC product)

Connect to

the COM. PORT1 or

COM. PORT3

Z-COM module

Cable type: W-BF-02-3000 (RKC product, Sold separately) [Standard cable length: 3 m]

W-BF-28-3000 (RKC product, Sold separately) [Standard cable length: 3 m]

Communication cable

(W-BF-28)

D-SUB 9P connector

W-BF-02 * or W-BF-28 communication cable (RKC product) can be used as communication

cable (sold separately). If noise is a factor, customer should use a twisted pair cable (not

included) or something to that effect.

* Shield of the cable are connected to SG (No. 6 pin) of the Z-COM modular connector.

Recommended RS-232C/RS-422A converter: COM-A (RKC product)

For the COM-A, refer to COM-A/COM-B Instruction Manual (IMSRM33-E).

For the termination resistor of Z-COM module, refer to 3.4 Termination Resistor of Z-COM

Module (P. 14).

3. WIRING

IMS01T23-E4

7

 When the interface of host computer is RS-422A

Shielded twisted pair wire

Pair wire

Host computer

T (A)

T (B)

SG

R (A)

R (B)

RS-422A

1

2

3

4

5

6

R1

R1: Termination Resistor

(Example: 120  1/2 W)

(Host computer side)

* COM. PORT1 and COM. PORT2 are internally connected.

R2: Termination resistor for Z-COM (Sold separately)

[120  1/2 W]

1

R (A)

R (B)

SG

T (B)

T (A)

SG

COM. PORT1 *

2

3

4

5

6

R (A)

R (B)

SG

T (B)

T (A)

SG

COM. PORT2 *

R2

Z-COM module

()

()

()

()

()

()

()

For the termination resistor of Z-COM module,

refer to 3.4 Termination Resistor of Z-COM

Module (P. 14).

The method wiring of COM. PORT3 and COM. PORT4 is the same as a figure above.

3. WIRING

IMS01T23-E4

8

 When the host computer has a USB connector

When the host computer has a USB connector, connect the USB communication converter between the

host computer and the Z-COM module.

Host computer

USB communication

converter COM-K

(RKC product)

Connected to USB

port of personal

computer

USB cable

(COM-K accessory)

Connected to

USB connector

of COM-K

The termination

resistor is built

into the COM-K.

RS-422A

SG

2

4

3

5

T (A)

T (B)

Shielded twisted

pair wire

1

R (A)

R (B)

SG

T (B)

T (A)

SG

COM. PORT1 *

2

3

4

5

6

R (A)

R (B)

SG

T (B)

T (A)

SG

COM. PORT2 *

R2

Z-COM module

R2: Termination resistor for Z-COM (Sold separately)

[120  1/2 W]

R (A)

R (B)

Pair wire

* COM. PORT1 and COM. PORT2 are internally connected.

1

2

3

4

5

6

1

()

(



)

(



)

(



)

For the termination resistor of Z-COM module,

refer to 3.4 Termination Resistor of Z-COM

Module (P. 14).

The method wiring of COM. PORT3 and COM. PORT4 is the same as a figure above.

3. WIRING

IMS01T23-E4

9

3.2 When Connected with RS-485

Customer is requested to prepare a communication cable fit for the SRZ unit to be connected by the host

computer.

 Pin layout of modular connector

The contents of the modular connector signal are all the same from COM. PORT1 to COM. PORT4.

Communication

port

COM. PORT1

Communication 2

Communication 1

COM. PORT2

COM. PORT3

COM. PORT4

COM

Modular connector pin number

(RS-485)

1

T/R (A)

2

T/R (B)

3

SG

4

Unused

5

Unused

6

SG

 Connector pin number and signal details

Pin No. Signal name Symbol

1

Send/Receive data T/R (A)

2

Send/Receive data T/R (B)

3

Signal ground SG

4

Unused



5

Unused



6

Signal ground SG

The 6-pin type modular connector should be used for the connection to the Z-COM module.

Recommended model: TM4P-66P (Manufactured by HIROSE ELECTRIC CO., LTD.)

3. WIRING

IMS01T23-E4

10

 When the interface of host computer is RS-232C

Use a RS-232C/RS-485 converter with an automatic send/receive transfer function.

Host computer

SG

T/R (A)

T/R (B)

RS-232C/RS-485 converter

Rcommended:

CD485, CD485/V manufactured

by Data Link, Inc. or equivalent.

RS-232C

Pair wire

RS-485

Shielded twisted

pair wire

R1

R1: Termination resistor

Example:

120



1/2 W

Converter side

COM. PORT1 *

1

2

3

4

5

6

T/R (A)

T/R (B)

SG

Unused

SG

Z-COM module

1

2

3

4

5

6

T/R (A)

T/R (B)

SG

Unused

SG

COM. PORT2 *

R2

R2: Termination resistor for Z-COM (Sold separately)

[120



1/2 W]

* COM. PORT1 and COM. PORT2 are internally connected.

()

()

For the termination resistor of Z-COM module,

refer to

3.4 Termination Resistor of Z-COM

Module (P. 14)

.

The method wiring of COM.PORT3 and COM.PORT4 is the same as a figure above.

3. WIRING

IMS01T23-E4

11

 When the interface of host computer is RS-485

Shielded twisted

pair wire

Pair wire

RS-485

R1

Host computer

SG

T/R (B)

T/R (A)

R1: Termination resistor

(Example: 120



1/2 W)

(Host computer side)

COM. PORT1 *

1

2

3

4

5

6

T/R (A)

T/R (B)

SG

Unused

SG

Z-COM module

1

2

3

4

5

6

T/R (A)

T/R (B)

SG

Unused

SG

COM. PORT2 *

R2

R2: Termination resistor for Z-COM (Sold separately)

[120



1/2 W]

* COM. PORT1 and COM. PORT2 are internally connected.

()

()

()

()

For the termination resistor of Z-COM module,

refer to

3.4 Termination Resistor of Z-COM

Module (P. 14)

.

The method wiring of COM. PORT3 and COM. PORT4 is the same as a figure above.

3. WIRING

IMS01T23-E4

12

 When the host computer has a USB connector

Host computer

USB communication

converter COM-K

(RKC product)

Connected to USB

port of a personal

computer

USB cable

(COM-K accessory)

Connected to

USB connector

of COM-K

The termination

resistor is built

into the COM-K.

RS-485

1

SG

2

4

3

5

T/R (A)

T/R (B)

Unused

Shielded twisted

pair wire

Pair wire

COM. PORT1 *

1

2

3

4

5

6

T/R (A)

T/R (B)

SG

Unused

SG

Z-COM module

1

2

3

4

5

6

T/R (A)

T/R (B)

SG

Unused

SG

COM. PORT2 *

R2

R2: Z-COM (Sold separately)

[120



1/2 W]

* COM. PORT1 and COM. PORT2 are internally connected.

()

()

For the termination resistor of Z-COM module,

refer to

3.4 Termination Resistor of Z-COM

Module (P. 14).

3. WIRING

IMS01T23-E4

13

3.3 Multiple SRZ Unit Connections

[Example: When two or more SRZ units are connected to the communication 1]

Connect to the

COM. PORT2

SRZ unit 1 (Unit address 0)

SRZ unit 2 (Unit address 1)

SRZ unit 3 (Unit address 2)

Connect to the

COM. PORT1

Connect to the

COM. PORT2

Communication 1

If communication errors occur frequently,

connect termination resistor to the Z-COM

module.

Connect to the COM. PORT2

Host computer

or

Operation panel

Connect to the

COM. PORT1

Connect to the

COM. PORT1

W-BF-02

For RS-422A interface, order W-BF-02 connection cable (sold separately) to connect the SRZ

unit. If noise is a factor, customer should use a twisted pair cable (not included) or something to

that effect.

Cable type: W-BF-02-3000 (Sold separately) [Standard cable length: 3 m]

COM. PORT1 and COM. PORT2 are internally connected.

This description also applies even when the communication 2 is connected.

For the termination resistor of Z-COM module, refer to

3.4 Termination Resistor of Z-COM

Module (P. 14).

3. WIRING

IMS01T23-E4

14

3.4 Termination Resistor of Z-COM Module

If communication errors occur frequently due to the operation environment or the communication distance,

connect termination resistors to the Z-COM module and the other party unit. For the termination resistor of

the Z-COM module, connect a Z-COM termination resistor connector (sold separately).

Termination resistor for Z-COM (Sold separately): W-BW-01 (for RS-485) [120  1/2 W]

W-BW-02 (for RS-422A) [120

 1/2 W]

For the termination resistor of the other party unit, refer to the other party unit Instruction Manual.

Host computer

Operation panel

SRZ unit 1

(Unit address 0)

When the COM. PORT1 is used:

Insert the termination resistor to

COM. PORT2.

When the COM. PORT3 is used:

Insert the termination resistor to

COM. PORT4.

When two or more SRZ units are connected, connect a termination resistor to the Z-COM module at the

farthest end of the communication line.

Host computer

Operation panel

SRZ unit 1

(Unit address 0)

SRZ unit 16

(Unit address F)

Connect a termination

resistor to the Z-COM

module at the farthest

end of the communication

line.

Termination resistor of the function modules (Z-TIO, Z-DIO and Z-CT modules):

When using a Z-COM module joined together with function modules, there is no need to connect

a termination resistor to the function modules.

SRZ unit

12

345

Not necessary

Function modules

There is no need to connect a termination

resistor to the base of the function module.

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