DVP-ES2-EX2-SS2-SA2-SX2-Operation Manual

3. Instruction Set
RTU mode (M1143 = ON)
When X0 = ON, MODRW instruction executes the function specified by Function Code 06
PLC VFD-B, PLC sends: “01 06 2000 1770 8C 1E”
VFD-B → PLC, PLC receives: “01 06 2000 1770 8C 1E”
Registers for data to be sent (sending messages)
Register Data Descriptions
D1256 Low byte 01 H Address
D1257 Low byte 06 H Function
D1258 Low byte 20 H
D1259 Low byte 00 H
Data Address
D1260 Low byte 17 H Data H1770 = K6000.
D1261 Low byte 70 H content The content of register D50
D1262 Low byte 8C H CRC CHK Low
D1263 Low byte 1E H CRC CHK High
Registers for received data (responding messages)
Register Data Descriptions
D1070 Low byte 01 H Address
D1071 Low byte 06 H Function
D1072 Low byte
D1073 Low byte
D1074 Low byte
D1075 Low byte
20 H
00 H
17 H
70 H
Data Address
Data content
D1076 Low byte 8C H CRC CHK Low
D1077 Low byte 1E H CRC CHK High
Program example 8: COM1 (RS-232) / COM3 (RS-485), Function Code H06
1. Function code K6 (H06): Write in single Word device.
2. Set the value to be written into VFD-B in the register specified by operand S.
3. PLC COM1/COM3 will not process the received data.
4. Take the connection between PLC (PLC COM3) and VFD-B for example, the tables below
explains the status when PLC COM3 writes in single Word device in VFD-B (M1320 = OFF,
ASCII Mode ), (M1320 = ON, RTU Mode)
• If PLC applies COM1 for communication, the below program can be usable by changing:
1. D1109→D1036: communication protocol
2. M1136→M1138: retain communication setting
3. D1252→D1249: Set value for data receiving timeout
4. M1320→M1139: ASCII/RTU mode selection
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