IDEC FT1A Series User Manual

11: M ODBUS C OMMUNICATION
11-14 S MART AXIS P RO /L ITE U SER ' S M ANUAL FT9Y-B1378
Function Code 05 (Force Single Coil)
Function code 05 changes a bit device status of Q (output), R (shift register), or M (internal relay).
Communication Frame
Request from Modbus Master
ACK Reply from Modbus Slave
NAK Reply from Modbus Slave
Communication Example
• RTU Mode
Slave No. Function Code Address
OFF: 0000h
ON: FF00h
xxh 05h xxxxh xxxxh
Slave No. Function Code Address
OFF: 0000h
ON: FF00h
xxh 05h xxxxh xxxxh
Slave No. Function Code Error Code
xxh 85h xxh
Purpose
Force internal relay M1320 on.
M1320 → (132 – 0) × 8 + 0 + 1001 = 2057
Modbus address: 2057
2057 – 1 = 2056 = 808h
Communication frame address: 0808h
Condition Slave No. 8
Request from Modbus Master 08 05 0808 FF00 (CRC)
ACK Reply from Modbus Slave 08 05 0808 FF00 (CRC)
NAK Reply from Modbus Slave 08 85 xx (CRC)

IDEC FT1A Series Specifications

General

Brand	IDEC
Model	FT1A Series
Category	Controller
Language	English