Delta DVP-ES2/EX2/SS2/SA2/SX2/SE manual RTU mode M1143 = on

3. Instruction Set

RTU mode (M1143 = ON)

When X0 = ON, MODRW instruction executes the function specified by Function Code 06 PLC Ö 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	Data Address
D1259 Low byte	00 H
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	20 H	Data Address
D1073 Low byte	00 H
D1074 Low byte	17 H	Data content
D1075 Low byte	70 H
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)

z 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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