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Modbus

SECTION 5 Modbus Communications Procedure

5-22

Table of Contents

Preface3
- Safety Precautions6
- Related Manuals11
Conventions Used in this Manual11
Table of Contents13
Overview of Communications Methods16
- Introduction16
- Communications Specifications17
- Transmission Procedure17
- Interface18
- Wiring18
- RS-232C (E5AN, E5EN, and E5GN Only)1-620
- Communications Parameters21
- Communications Parameter Setup21
- Communications Parameters22
- Setting Communications Writing23
Compoway/F Communications Procedures25
Data Format26
- Command Frame26
- Response Frame27
- BCC Calculation Example27
- Communications Data28
- End Code Example28
Structure of Command Text30
- PDU Structure30
- Area Definitions30
- Type Code (Variable Type)30
- Addresses31
- Number of Elements31
- List of Services (Main Request Codes and Sub-Request Codes)31
Detailed Description of the Services33
- Read Variable Area33
- Write Variable Area34
- Composite Read from Variable Area36
- Composite Write to Variable Area37
- Read Controller Attributes40
- Read Controller Status41
- Echoback Test42
- Operation Command43
Response Code List50
Communications Data for Compoway/F and SYSWAY51
Variable Area (Setting Range) List52
Status and Status 265
- Status Structure65
- Status 2 Structure67
- Status Details68
- Status 2 Details69
Data Format72
- Command Frame Format72
- FCS Calculation Example72
- Response Frame73
- Communications Data73
- SYSWAY Command Lists74
Command Descriptions75
- Read Process Value75
- Write Set Values76
- Read Set Values and MV Monitor77
- Select Communications Writing79
Modbus Communications Procedure81
Data Format82
- Command Frame82
- Calculation Example83
- Response Frame84
- Normal Response Frame84
- Error Response Frame84
- Error Codes85
- No Response85
Function List86
Variable Area87
- Addresses87
Detailed Description of the Services89
- Variable Read, Multiple89
- Number of Elements89
- Variable Write, Multiple91
- Variable Write, Single/Operation Command94
- Echoback Test100
Communications Data for Modbus103
Variable Area (Setting Range) List104
Status and Status 2119
- Status Structure119
- Status 2 Structure121
- Status Details122
- Status 2 Details123
Appendix125
ASCII List125
Troubleshooting127
Index129
Revision History131

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