Rockwell Automation 900 User Manual

Temperature Controller Communications Functions

USER MANUAL

Bulletin No. 900-TCx

-ii

ATTENTION

IMPORTANT

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical equipment. "Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls” (Publication SGI-1.1 available from your local Rockwell Automation Sales Office or online at http://www.ab.com/ manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or part, without written permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we use notes to make you aware of safety considerations:

Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss

Attention statements help you to:

• identify a hazard

• avoid a hazard

• recognize the consequences

Identifies information that is critical for successful application and understanding of the product.

Publication 900-UM004D-EN-E - July 2010

-iii

European Communities (EC) Directive Compliance

If this product has the CE mark it is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

This product is tested to meet the Council Directive 89/336/EC Electromagnetic Compatibility (EMC) by applying the following standards, in whole or in part, documented in a technical construction file:

EN 61326 EMC Requirements — Electrical Equipment for Control, Measurement and Laboratory Use

This product is intended for use in an industrial environment.

Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61010-1 Safety Requirements for Electrical Equipment for Control, Measurement and Laboratory Use — General Requirements. For specific information, see the appropriate sections in this publication, as well as the Allen-Bradley publication Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, Publication 1770-4.1.

This equipment is classified as open equipment and must be mounted in an enclosure during operation to provide safety protection.

Publication 900-UM004D-EN-E - July 2010

-iv

Notes:

Publication 900-UM004D-EN-E - July 2010

Table of Contents

Important User Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -ii

European Communities (EC) Directive Compliance. . . . . . . . . . . . . -iii

EMC Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -iii

Low Voltage Directive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -iii

Preface

About Communications Methods

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Safety Signal Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Conventions Used in This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Meanings of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

How to Read Display Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2

Chapter 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Communications Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Transmission procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

RS-485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

RS-232C (Applies to the 900-TC8 only). . . . . . . . . . . . . . . . . . . . 1-4

Communications parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Communications Parameter Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Communication Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

Setting Communications Writing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

Chapter 2

Bulletin 900 Communications Procedures 900-TCx (CompoWay/F)

Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Command Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

BCC Calculation Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Response Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Communications Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Example of End Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

Structure of Command Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

PDU (Protocol Data Unit) Structure . . . . . . . . . . . . . . . . . . . . . . 2-5

Area Definitions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

Type Code (Variable Type) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Number of Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

List of Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

Detailed Description of Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

-ii Table of Contents

Read from Variable Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

Write to Variable Area. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

Composite Read from Variable Area . . . . . . . . . . . . . . . . . . . . . 2-12

Composite Write to Variable Area . . . . . . . . . . . . . . . . . . . . . . . 2-13

Read Controller Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

Read Controller Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

Echoback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

Operation Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

Chapter 3

Communications Data

Modbus Communications Procedure

Variable Area (setup range) List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Status Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14

Chapter 4

Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Command Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Response Frame. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Function List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Variable Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Number of Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

Detailed Description of the Services. . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Read Variable Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

Write Variable Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Variable Write, Single/Operation Command. . . . . . . . . . . . . . . 4-15

Echoback Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22

Chapter 5

Communications Data for Modbus

Publication 900-UM004D-EN-E - July 2010

Variable Area (Setting Range) List. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

Appendix A

ASCII Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

Preface

ATTENTION

Safety Precautions

Conventions Used in This Manual

Safety Signal Words

This manual uses the following signal word to mark safety precautions for the Bulletin 900-TCx.

These precautions provide important information for the safe application of the Bulletin 900-TCx Temperature Controller. You must make sure to follow the instructions provided in all safety precautions.

Identifies information about practices or circumstances that can lead to personal injury or death, property damage or economic loss

Meanings of Abbreviations

The following abbreviations are used in parameter names, figures, and in text explanations. These abbreviations mean the following:

Table P.1

Symbol Term

PV Process value SP Set point AT Auto-tuning ST Self-tuning EU Engineering unit ➊

➊ EU stands for Engineering Unit. EU is used as the minimum unit for engineering units such as °C, m, and g. The

size of EU varies according to the input type. For example, when the input temperature setting range is –200…+1300°C, 1 EU is 1°C, and when the input temperature setting range is –20.0…+500.0°C, 1 EU is

0.1°C. In the case of analog input, the size of EU varies according to the decimal point position of the scaling setting, and 1 EU becomes the minimum scaling unit.

P-1 Publication 900-UM004D-EN-E - July 2010

P-2 Preface

ABCDEFG

IJKL

RS T UVWX Y Z

abcdefghijklm

nopqrstuvwxyz

Symbol

Alphabet

How to Read Display Symbols

The following table shows the relationship between the symbols exhibited on the controller’s front panel displays to alphabet characters.

Publication 900-UM004D-EN-E - July 2010

About Communications Methods

Chapter

Introduction

This chapter briefly describes the supported communications methods and how to wire equipment. First-time users must read this chapter to ensure proper installation of the equipment.

The programs for the communications functions are created on the host device (PLC or computer), and the 900-TCx's parameters are monitored or set from the host PLC or computer. Therefore, the description provided here is from the viewpoint of the host device.

All Bulletin 900 Temperature Controllers offer an ASCII communications protocol format based on CompoWay/F for general serial communications. This format uses a standard frame format. Therefore, it can simplify communications between 900-TCx components and the host device.

The 900-TC8, 900-TC16, and 900-TC32 controllers also have Modbus® communication protocol. Modbus is a standard communications control method that conforms to the Modicon Company’s RTU-mode Modbus protocol (PI-MBUS-300 Revision J). It supports functions equivalent to the CompoWay/F Read Variable Area, Write Variable Area, Operation Command, and Echoback Test functions.

Simplified communications can include:

• Reading/writing of parameters

• Operation instructions

• Selection of setup levels

Communications are subject to the following condition:

• Parameters can be written only when the Communications writing

parameter is set to ON (enabled).

Modbus is a registered trademark of Schneider Electric

1-1 Publication 900-UM004D-EN-E - July 2010

1-2 About Communications Methods

Communications Specifications

Table 1.1

Transmission line connection➊ RS-485 : Multiple point, or RS-232C : Point to point Communications method➊ RS-485 (2-wire, half-duplex), or RS-232C Synchronization method Start-stop synchronization Baud rate 1200, 2400, 4800, 9600, 19200, 38400, or 57600 bps Communication code➋ ASCII Data bits➋ 7 or 8 bits Stop bits➋ 1 or 2 bits Error detection − Parity (none, even or odd) BCC (block check

character)

− BCC with CompoWay/F (900-TC)

− CRC-16 (Cyclic Redundancy Check 16) Modbus➍

communications Flow control None Interface➊ RS-485/RS-232C Retry function None Communications buffer 217 bytes➌, 40 byte Communications response wait

time

0 to 99 ms, default time: 20 ms

Transmission procedure

Note: Highlighted characters in the table above indicate defaults. ➊ Direct RS-232C communication is only available with the 900-TC8. However, the 900-CONVx25(B) RS232/USB

to RS485 converter can be used for 900-TC16 and 900-TC32 controllers.

➋ Communications speed, data bits, stop bits and vertical parity can each be configured independently in the

controller’s Communications Setting function group.

➌ 900-TC8, 900-TC16, and 900-TC32 Series B controllers only. ➍ The communications data length for Modbus must be 8 bits.

When the host device transmits a command frame, the 900-TCx transmits a response frame that corresponds to the command frame. A single response frame is returned for each command frame. The following diagram shows the operation of the command and response frames.

Command Frame

Host Device

900-TCx Temperature Controller

Response Frame

Command Frame

Allow a wait time of at least 2 ms until the next command is sent after the host device receives a response from the 900-TCx temperature controller.

Publication 900-UM004D-EN-E - July 2010

About Communications Methods 1-3

Abbr

_ +

900-TC32

12118

Pin No.

RS-485

Communications Transceiver

6.8V

Terminator

120Ω

(1/2W)

900-TCx end node RS-485

Use a terminator of resistance 120Ω = (1/2W)

Shielded cable

Both ends of the transmission line (including the host device) must be specified (by setting terminator ON) as the end node. The total resistance of

the terminators must be at least 54Ω.

A<B: [1] mark A>B: [0] space

Shielded cable

Host Device RS-485

900-TC8/16

Abbr

A ( – ) B ( + )

900-TC32

12 11

Pin No.

900-TC8/16

Abbr

A ( – ) B ( + )

Interface

Wiring

Communications with the host device are carried out through a standard RS-485 or RS-232C(900-TC8x) interface. Use a cat. no. 900-CONVxx interface converter for RS232C/USB to RS485 conversion.

RS-485

• RS-485 connections can be 1:1 or 1: N. A maximum of 32 Units

(including the host device) can be connected in one-to-N systems.

• The total cable length is 500 m max.

• Use a shielded, twisted-pair cable #24 AWG (0.205 mm

(2.081 mm

) for the 900-TC8 and 900-TC16.

• Use a shielded, AWG24 to AWG18 (cross-sectional area of 0.205 to

0.823 mm2) twisted-pair cable for the 900-TC32.

)…#14 AWG

Match the communications specifications of the 900-TCx and the host device. If a one-to-N system is being used, be sure that the communications specifications (Refer to Communications Specifications on page 1-2) of all devices in the system (except individual unit numbers) are the same.

This section explains how to set the 900-TCx's communications specifications. For details on the host device, refer to publication 900-UM007*.

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1-4 About Communications Methods

Cable Reference Diagram

900-TCxx #24 AWG…#14 AWG Conductor cross-section

0.205 mm to 2.081mm

No.

11 12 13

SD RD SG

RS-232C

900-TC8

Host Device RS-232C : 25P

2 3 4 5 6 7

SD(TXD) RD(RXD) RS(RTS) CS(CTS) DR(DSR) SG ER(DTR) FG

No.

RS-232C

900-TC8

Host Device RS-232C : 9P

SD(TXD)

RD(RXD)

RS(RTS)

CS(CTS)

DR(DSR)

ER(DTR)

RS-232C (Applies to the 900-TC8 only)

• RS-232C connections are 1:1.

• The total cable length is 15m max.

• Use a shielded, AWG24 to AWG14 (cross-sectional area of 0.205 to

2.081 mm2) twisted-pair cable for the 900-TC8 and 900-TC16.

• Use a shielded, AWG24 to AWG18 (cross-sectional area of 0.205 to

0.823 mm2) twisted-pair cable for the 900-TC32.

Wiring for 25-pin RS-232 connector on host device

Publication 900-UM004D-EN-E - July 2010

Wiring for 9-pin RS-232 connector on host device

About Communications Methods 1-5

Communications parameters

The 900-TCx's communications specifications are set/configured in the Communications Setting function group. These parameters are set on the 900-TCx's front panel.

The table below shows the communications parameters and their ranges.

Table 1.2 Communication Parameters and Ranges

Parameter Displayed

Characters

Communication protocol psel cwf/mod Communications unit

number Baud rate bps 1.2 / 2.4 / 4.8 /

Communications data length

Communications stop bit sbit 1/2 1/2 Communications parity prty None/even/odd none/even /odd Send data wait time sdwt 0…99 0…99 ms, default time:

u-no 0…99 0, 1…99

len 7/8(bit) 7/8 (bit)

Setting Range Set Value

(Blue highlighted characters indicate defaults)

1 .2 / 2.4 / 4.8 /

9.6 /19.2 / 38.4 / 57.6 (kbps)

9.6/19.2/38.4/57.6 (kbps)

20 ms

Note: Highlighted values indicate default settings.

The communications data length for Modbus must be 8 bits.

Publication 900-UM004D-EN-E - July 2010

1-6 About Communications Methods

psel

cwf

u-no

bps

9.6

len

56it

prty

eVen

sdwt

Protocol selection

Communications unit number

Communications baud rate

Communications data length (See note.)

Communications stop bits (See note.)

Communications parity

Send data wait time

Communications Parameter

Before you carry out communications with the 900-TCx, set up communications unit number, baud rate and other parameters by carrying out

Setup

the following procedure. For details of operations other than communications parameter setup, refer to the applicable 900-TCx User Manual.

Table 1.3 900-TCx User Manuals

Communications Parameter Setup

Temperature Controller Model Number User Manual

900-TC8 900-UM007* 900-TC16 900-UM007* 900-TC32 900-UM007*

1. Hold down the key for at least three seconds to move from the Operation function group to the Initial Setting function group.

2. Press the key for less than one second to move from the Initial Setting V to the Communications Setting function group.

Publication 900-UM004D-EN-E - July 2010

3. Select the parameters as shown below by pressing the

4. Use the

D or U keys to change the parameter set values.

M key.

Note: Displayed only when the Protocol Selection is CWF (900-TC)

About Communications Methods 1-7

Communication Parameters

Note that communications parameters are enabled after they have been changed by resetting the controller.

• Protocol Selection (

psel)

The communications protocol can be selected. Set CompoWay/F (900-TC) or Modbus.

• Communications unit number (

u-no )

This parameter is for setting a unique unit number for each of the temperature controllers in the system. This unit number is set so that the host device can identify the temperature controller when communications are carried out with the host device. Set a unit number within the range 0 to 99 for each temperature controller connected to the host device on the network. Default is “1”. When two or more temperature controllers are used, do not set them to the same unit number Doing so will prevent normal communications operation.

• Baud rate (

bps)

This parameter is for setting the baud rate when communicating with the host device. Set one of "1.2 (1200 bps)", "2.4 (2400 bps)", "4.8 (4800 bps)", "9.6 (9600 bps)", "19.2 (19200 bps)", "38.4 (38400 bps)", or “57.6 (57600 bps)➊”. All units must be set to the same baud rate.

• Communications data length {

len )

This parameter is for setting the communications data length. Set either of "7 bits" or "8 bits". All units must be set to the same communications data length.

• Communications stop bit (

sbit )

This parameter is for setting the communications stop bit. Set either of "1" or "2". All units must be set to the same communications stop bit value.

• Communications parity (

prty)

This parameter is for setting the communications parity. Set one of "none", "even" or "odd". All units must be set to the same communications parity value.

• Send Data Wait Time (

sdwt)

The send data wait time can be set in 1-ms increments between 0 and 99 ms. The default is 20 ms.

➊ Offered with 900-TC8, 900-TC16, and 900-TC32 Series B controllers.

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1-8 About Communications Methods

Setting Communications Writing

Set the communications writing parameter to ON to allow the host to write to the 900-TCx controller(s) via communications.

Parameter Setting

1. Press the key for less than one second to move from the operation level tot he adjustment level.

2. Select the parameters as shown below by pressing the

3. Use the

D or U keys to set the communications writing parameter to

ON.

l.adj

cmwt

Adjustment Level Display Displayed only once when entering adjustment level.

AT Execute/Cancel

off

Communications Writing

off

•

M key.

Publication 900-UM004D-EN-E - July 2010

Chapter

STX

Node No.

12 2

Sub-address

0 00

SID

BCC Calculation Range

Tex t

Command Text

ETX

BCC

Bulletin 900 Communications Procedures 900-TCx (CompoWay/F)

Data Format

Unless otherwise indicated, numbers in this manual are expressed in hexadecimal (with an H’ before the number: e.g., H’02). Values without the H’, such as 00, are ASCII. The number underneath each delimiter in a frame indicates the number of bytes.

Command Frame

Table 2.1

STX This code (H’02) indicates the beginning of the communications frame

(text). Always set this character in the first byte. When STX is received again during reception, reception is carried out again from the point where STX was received.

Node number • This number specifies the transmission’s destination.

• Specify the 900-TCx’s communication unit number.

• A BCD value between 00 and 99 or an ASCII value of XX can be set.

• Specify XX for a broadcast transmission. No responses will be returned for broadcast transmissions.

• No responses will be returned from node numbers other than the ones in the above range.

Sub-address This is not used on the 900-TCx. Be sure to set the sub-address to 00. SID (service ID) This is not used on the 900-TCx. Be sure to set the Service ID to 00. Command text Command text area. Refer to Structure of Command Text on page 2-5 ETX This code (H’03) indicates the end of the text. BCC Block Check Character The BCC result is found by calculating the

exclusive OR of the bytes from the node number up to ETX.

2-1 Publication 900-UM004D-EN-E - July 2010

BCC Calculation Example

The BCC (Block Check Character) is determined by calculating the exclusive OR of the bytes from the node number up to ETX. The 8-bit result is written to the BCC byte at the end of the frame.

STX Node No. Sub-address SID Command Text ETX BCC

02H 0(30H) 0(30H) 0(30H) 0(30H) 0(30H) 0(30H) 5(35H) 0(30H) 3(33H) 03H 35H

BCC=30H⊕30H⊕30H⊕30H⊕30H⊕30H⊕35H⊕30H⊕33H⊕03H=35H

Calculation result 35H is set to the BCC area. The

⊕

symbol indicates exclusive OR operation and the H indicates hexidecimal code.

2-2 Bulletin 900 Communications Procedures 900-TCx (CompoWay/F)

Command Text BCC

ETX

1 1

222

End CodeSub-addressNode No.

STX

Response Frame

Table 2.2

End

Name Description Error

Code

00 Normal

The command ended normally without error. None

completion

0F FINS

command error

The specified FINS command could not be executed. The FINS response code should indicate why the command could not be executed.

10 Parity error The sum total of bits whose received data is 1 does

not match the set value of Communications Parity.

11 Framing

Stop bit is 0. 1

error

12 Overrun

error

An attempt was made to transfer new data when the reception data was already full.

13 BCC error The calculated BCC value is different from the

received BCC value.

14 Format error • The command text contains characters other than

0 to 9, and A to F. This error is not applicable to the echoback test. (For details, see Refer to Echoback Test on page 2-17)

• No SID and command text. Or, no command text

• MRC/SRC not included in command text

16 Sub-address

error

• Illegal (unsupported) sub-address

• No sub-address, SID and command text

• Sub-address less than two characters, and no SID and command text

Detection Priority

Publication 900-UM004D-EN-E - July 2010

18 Frame

length error

The received frame exceeds the fixed (supported) number of bytes.

• The end code is returned for each command frame that was addressed to the local node.

• No response will be returned unless the frame contained all elements up to the ETX and BCC.

• “Error Detection Priority” indicates the priority when two or more errors occur simultaneously.

Bulletin 900 Communications Procedures 900-TCx (CompoWay/F) 2-3

STX

Node No. Sub-address SID BCC

0 00ETX

BCC

ETX

End Code

410

Sub-address

Node No.

STX

Communications Data

Table 2.3 Communications Data

Communications Specifications

CompoWay/F (Bulletin 900-TCx)

Set (Monitor) Value

8 digits (Hex) 2's complement Decimal point is removed and

Minus Value Decimal Point

the result is converted to hexadecimal. Example: 105.0

Æ 1050 Æ H’000041A

Example of End Code

The following examples show an end code when a command did not end normally.

Example 1: Illegal sub-address, and no SID and command text

Command Format:

Node No. Sub-address BCC

STX 0 A ETX

Response Format:

BCC

STX

Node No.

Sub-address

End Code

ETX

End code is "16" (sub-address error).

This is because a sub-address was received and the sub-address error has a higher error detection priority than the format error.

Example 2: No command text

Command Format:

Response Format:

End code is 14 (format error).

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2-4 Bulletin 900 Communications Procedures 900-TCx (CompoWay/F)

No response

BCC

ErrETXSTX

Node No.

BCC

ETX

End Code

Sub-address

Node No.

STX

Example 3: No node number provided

Command Format:

The node number is lacking one character.

Response Format:

Example 4: No sub-address, and illegal BCC

Command Format:

BCC

ETXSTX

Response Format:

Sub-address is 00 and end code is 13 (BCC error).

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Bulletin 900 Communications Procedures 900-TCx (CompoWay/F) 2-5

MRC SRC MRES SRES Data

MRC SRC MRES SRES

Structure of Command Text

PDU (Protocol Data Unit) Structure

An MRC (Main Request Code) and SRC (Sub-Request Code) followed by the various required data is transferred to the command text.

Service request PDU

MRC SRC Data

The MRES (Main Response Code) and SRES (Sub-Response Code) are transferred to the response frame following the above MRC/SRC. Data is then transferred following the MRES and SRES.

Service response PDU (during normal operation)

If the specified command text could not be executed, the service response PDU will contain only MRC/SRC and MRES/SRES.

Service response PDU (command text not executed)

MRES/SRES provides the response code. MRES/SRES are not output when processing ends in a normal operation.

Area Definitions

Areas comprise only the variable area.

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MSB LSB

0000

Type Code (Variable Type)

The following defines variable area type codes.

Variable type (1 byte)

Access size Area Read/Write

11: Double-word 0: Setup area 0 0: Read only

10: Word 1 : Setup area 1 1 : Read/write

The following table summarizes setup areas 0 and 1.

Table 2.4

Area Description

Setup area 0

Setup area 1

This area groups together the Protect, Manual Control, Operation and Adjustment function groups.

This area groups together the Initial Setting, Communications Setting, Advanced Function Setting and Calibration function groups.

The variable type is converted to 2-byte ASCII code and loaded to the frame. The following table shows available variable types.

Table 2.5

Variable Type Description

CO/80 R/O (read only) parameter for setup area 0. C1/81 R/W parameter for setup area 0. C3/83 R/W parameter for setup area 1 .

Note: Setup area 1 has no R/O (read only) parameters. Therefore, variable type C2 does not exist.

Addresses

Each of the variable types is appended with an address. Express addresses in 2-byte hexadecimal code, and append for the specified access size.

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Bulletin 900 Communications Procedures 900-TCx (CompoWay/F) 2-7

Number of Elements

The number of elements is expressed in 2-byte hexadecimal code. The range that can be specified for the number of elements depends on the command. Refer to Detailed Description of Services on page 2-8.

List of Services

Table 2.6

MRC SRC Name of Service Process

01 01 Read from variable

area 01 02 Write to variable area This service writes to variable areas. 01 04 Composite Read from

Variable Area 01 13 Composite Write to

Variable Area

This service reads from variable areas.

This service reads from the variable area in the order specified by the parameters.

This service writes to the variable area in the order specified by the parameters.

05 03 Read Controller

Attributes 06 01 Read controller status This service reads the run status of the

08 01 Echoback test This service carries out the echoback test. 30 05 Operation instructions This service carries out run/stop,

This service reads the model number and communications buffer size.

controller.

communications writing, write mode, save RAM data, AT (auto-tuning) execution/cancel, multi-SP, move to protect function, move to setup area 1 and software reset.

Note: No commands will be accepted and no responses will be returned when a memory error (RAM error) has occurred or the controller is initializing (until the controller recognizes the process value after the power is turned ON).

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Read Data

(for number of elements)

Response

Code

SRC

MRC

0101

Service Response PDU:

Service Request PDU:

MRC2SRC

22 2

0101

Variable

Type

Read Start

Address

Bit

Position

Number of

Elements

Number of elements X 8 or 4

Detailed Description of Services

Read from Variable Area

This service reads from variable areas.

• Variable Type and Read Start Address

For details on Variable Types and Read Start Addresses, refer to Chapter 3, Communications Data.

• Bit position

Bit accessing is not supported on the 900-TCx. It is fixed to 00.

• Number of elements

Table 2.7

Number of Elements Process

0000 The read operation is not performed (read data is

not appended to the service response PDU), and

processing ends in normal completion. Double word 0001…0019 (1…25) The read operation is carried out, and processing Word 0001…0032 (1…50)

ends in normal completion.

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Response code

ATTENTION

Normal Completion

Table 2.8

Bulletin 900 Communications Procedures 900-TCx (CompoWay/F) 2-9

Response Code

0000 Normal completion No errors were found.

Error Occurred

Table 2.9

Response Code

1001 Command too long The command is too long. 1002 Command too short The command is too short. 1101 Area type error The variable type is wrong. 1103 Start address out-of-range error The read start address is out of range. 110B Response too long The number of elements exceeds the

1100 Parameter error The bit position not 00. 2203 Operation error EEPROM error

Name Description

Error Name Cause

maximum/

Alarm function: Even though alarms are not displayed on the controller's display, they function normally in communications.

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Write to Variable Area

This service writes to the controller’s variable areas.

Service Request PDU:

MRC SRC

002

Variable

Type

Write Start

Address

Bit

Position

Number of

Elements

Write Data

(for number of elements)

Number of elements x 8 or 4

Service Response PDU:

MRC SRC Response

0 012

22 4

Code

• Variable Type and Write Start address

For details on variable types and write start addresses, refer to Chapter 3, Communications Data.

• Bit position

Bit accessing is not supported on the 900-TCx controller. Fixed to 00.

• Number of elements

Table 2.10

Number of Elements Process

0000 The write operation is not performed (do not

append write data to the service request PDU)

and processing ends in normal completion. Double word 0001…0018 (1…24) The write operation is performed and processing Word 0001…0030 (1…48)

ends in a normal completion.

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Bulletin 900 Communications Procedures 900-TCx (CompoWay/F) 2-11

ATTENTION

Response code

Normal Completion

Table 2.11

Response Code Name Description

0000 Normal completion No errors were found.

Error Occurred

Table 2.12

Response Code Error name Cause

1002 Command too short The command is too short. 1101 Area type error Wrong variable type 1103 Start address

out-of-range error

1104 End address

out-of-range error

1003 Number of elements/

data mismatch

Write start address is out of range.

The write end address (write start address + number of elements) exceeds the final address of the variable area.

The number of data does not match the number of elements.

1100 Parameter error • Bit position is other than 00.

• Write data is out of range. 3003 Read-only data Variable type CO was written to. 2203 Operation error • The Communications Writing

parameter is set to OFF (disabled).

• Attempted to write to a parameter in

setup area 1 from setup area 0.

• Attempted to write to a protect

parameter from other than protect group.

• AT (auto-tuning) was in progress. See

note.

• EEPROM error.

Note: For details on AT (auto-tuning), see publication 900-UM007*.

Alarm function: Even though alarms are not displayed on the controller's display, they are all functional in communications.

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MRC SRC

0104 00

22224

224

Variable type

Read address

Bit position

Variable type

Read address

Bit position

Variable type

Response code

Variable type

Read data

MRC

SRC

0104

Number of elements ×8 or 4

Read data

Number of elements ×8 or 4

Composite Read from Variable Area

This service reads in order the contents of specified addresses in the variable area.

Service Request PDU

Service Response PDU

Note: The read data is read together with the variable type in the order specified by the command.

Variable Type and Read Start Address

For details on variable types and read start addresses, Refer to Communications Data on page 2-3.

Bit Position

The 900-TCx controllers do not support bit access. Fixed to “00.”

Number of Read Data Items (Variable Type + Read Data)

Table 2.13

Read Data Length Number of Read Data Items

For double word 20 max. For word 25 max.

Response Code

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Normal completion

Bulletin 900 Communications Procedures 900-TCx (CompoWay/F) 2-13

Variable type

Write address

Variable type

Write data

MRC

SRC

0113

224

Write data

Write address

Bit position

Number of elements ×8 or 4

MRC SRC

0113

22 4

Response code

Table 2.14

Response Code Name Description

0000 Normal Completion No errors were found.

Error occurred

Table 2.15

Response Code Name Description

1002 Command too short The command is too short. 1101 Area type error The variable type is wrong.

110B Response too long

1100 Parameter error Bit position is not “00”. 2203 Operation error EEPROM error.

The number of elements exceeds the maximum.

Composite Write to Variable Area

This service reads in order the contents of specified addresses in the variable area.

Service Request PDU

Service Response PDU

Variable Type and Write Start Address

For details on variable types and read start addresses, Refer to Communications Data on page 2-3.

Bit Position

The 900-TCx controllers do not support bit access. Fixed to “00.”

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Number of Write Data Items (Variable Type + Write Data)

Table 2.16

Read Data Length Number of Read Data Items

For double word 12 max. For word 17 max.

Response Code

Normal completion

Table 2.17

Response Code Name Description

0000 Normal Completion No errors were found.

Error occurred

Table 2.18

Response Code Name Description

1002 Command too short The command is too short. 1101 Area type error The variable type is wrong.

• Bit position is not “00”.

1100 Parameter error

3003 Read-only error

2203 Operation error

• The write data is out of the setting range.

Variable type “CO” was written to.

• The Communications Writing parameter is set to “OFF” (disabled).

• Attempted to write to a parameter in setup area 1 from setup area 0.

• Attempted to write to a protect parameter from other than the protect group.

• AT (auto-tuning) was in progress. See note.

• EEPROM error

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Note: For details on AT (auto-tuning), see publication 900-UM007*.

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