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4 Modbus Communications Procedure
E5C-T Digital Controllers Programmable Type Communications Manual (H186)
4-4 Detailed Description of the Services
4
4-4-1 Variable Read, Multiple
Response Frame
Response Code
Reading Undisplayed Parameters
It is possible to read the parameters that are not displayed due to display settings as well as the
parameters that are never displayed in the Controller.
• Example Command and Response
The following example shows the command and response when reading the process value (slave
address: H'01).
Process Value in 4-byte Mode
• Address: H’0000; Read data: H’000003E8 (100.0 °C)
Process Value in 2-byte Mode
• Address: H’2000; Read data: H’03E8 (100.0 °C)
Name Description
Slave address The value from the command frame is entered as-is.
Function code This is the received function code.
When the function ended normally, the function code is left as-is. When an error
occurred, the hexadecimal value of H'80 is added to the function code to indicate
that the response is an error response.
Example: Received function code = H'03
Function code in response frame when an error occurred = H'83
Byte count Contains the number of bytes of read data.
Read data Contains the number of setting data items that were read.
CRC-16 This check code is calculated with the data from the slave address to the end of the
data.
For details on the CRC-16 calculation, refer to CRC-16 Calculation Example in 4-1-1
Command Frame on page 4-2.
Function code Error code Error name Cause
H'83 H'02
Variable address
error
The read start address is incorrect.
H
'03
Variable data error The number of elements exceeds the
allowed range.
H'03
--- Normal completion No errors were found.
CRC-16
11
2
1
Slave
address
Function
code
Byte
count
0 to 212 (2 × 106)
Read data (for the number of
elements)
H'03
Response: 01
03 04 00 00 03 E8 FA 8D(CRC-16)
Command: 01
03 00 00 00 02 C4 0B(CRC-16)
01 03 02 03 E8 B8 FA(CRC-16)
01 03 20 00 00 01 8FCA(CRC-16)
Response:
Command:
- Programmable Type 1
- Preface 3
- © OMRON, 2014 3
- Warranties 4
- Limitation on Liability; Etc 4
- Safety Precautions 6
- CAUTION 7
- Precautions for Safe Use 9
- Precautions for Safe Use 10
- Trademarks 11
- Versions 12
- Revision History 13
- Revision History 14
- Sections in This Manual 15
- CONTENTS 16
- Section A Appendices 18
- Communications Methods 19
- 1-1-1 Introduction 20
- 1-1-3 Transmission Procedure 21
- 1-1-4 Interface 21
- 1-1-5 Wiring 21
- 1 Communications Methods 22
- CompoWay/F Communications 25
- Procedures 25
- 2-1 Data Format 26
- 2-1-2 BCC Calculation Example 27
- 2-1-3 Response Frame 27
- 2-1-4 Communications Data 28
- 2-1-5 End Code Example 28
- 2-1 Data Format 29
- 2-1-5 End Code Example 29
- 2-2 Structure of Command Text 30
- 2-2-4 Addresses 31
- 2-2-5 Number of Elements 31
- Variable 32
- 2-3-2 Write Variable Area 33
- Response 36
- -5CCT AEX3R 38
- 2-3-7 Echoback Test 39
- (2) Response Code 40
- • Normal Completion 40
- • Error Occurred 40
- 2-3-8 Operation Command 41
- 2-3-8 Operation Command 43
- 2-4 Response Code List 46
- Communications Data for 47
- CompoWay/F 47
- 3-2 Status and Status 2 77
- 3-2 Status and Status 2 79
- Modbus Communications 81
- Procedure 81
- 4-1 Data Format 82
- 4-1 Data Format 83
- 4-1-1 Command Frame 83
- 4-1-2 Response Frame 84
- 4-1-3 Error Codes 85
- 4-2 Function List 86
- 4-3 Variable Area 87
- 4-4-1 Variable Read, Multiple 88
- Response Frame 89
- Response Code 89
- H'10 90
- Command Frame 92
- 4-4-4 Echoback Test 94
- PID set is fixed at PID1 98
- 5-2 Status 115
- Programless Communications 117
- 6-1-1 Introduction 119
- 6-1-2 Features 119
- 6-1-5 Connectable PLCs 121
- 6-2 E5@C-T Controller Setup 122
- 6-2-3 Send Data Wait Time 123
- Communications Setting Level 125
- 6-2-6 Receive Data Wait Time 126
- 6-2 E5@C-T Controller Setup 129
- Troubleshooting 133
- 6-2-10 Communications Writing 134
- 6-3 Controlling Programless 136
- Communications 136
- 6-3-2 Response Flag 137
- 6-3-4 Operation Command Codes 138
- 6-3-6 Write Mode 138
- 6-3-7 Troubleshooting 139
- CX-Programmer and USB driver 140
- 6-4-3 PLC Setup 141
- 6-4-3 PLC Setup 143
- 6-4-4 E5@C-T Controller Setup 144
- SCU21-V1 145
- 6-4-5 Checking Operation 146
- 6-4-5 Checking Operation 147
- Changing E5CC-T Settings 148
- Connecting to the PLC 152
- 6-5-3 PLC Setup 152
- 6-5-3 PLC Setup 153
- 6-5-4 E5@C-T Controller Setup 155
- 6-5-5 Checking Operation 155
- USB port 156
- USB connector 156
- Commercially 156
- QJ71C24N-R4 157
- (4) Click the OK Button 158
- (5) Click the Execute Button 158
- 6-6-3 PLC Setup 159
- 6-6-4 E5@C-T Controller Setup 162
- 6-6-5 Checking Operation 163
- 6-6-5 Checking Operation 165
- Component Communications 169
- 7-1 Component Communications 170
- 7-1-2 Wiring 171
- Initial Setting Level 172
- Operation Level 172
- Adjustment Level 172
- 7 Component Communications 173
- 7-2 Operation for Component 174
- 7-3 Troubleshooting 175
- Appendices 177
- A-1 ASCII List 178
- A-2 Troubleshooting 179
- A Appendices 180
- Contact: www.ia.omron.com 186
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