IDEC FC6A-C16K1CE Communications Manual page 142

6: M C
ODBUS OMMUNICATION
Function Code 15 (Force Multiple Coils)
Function code 15 changes bit device statuses of Q (output), R (shift register), or M (internal relay). One through 128 consecutive
bits can be changed.
Communication Frame
Request from Modbus RTU Master
Function
Slave No.
Code
xxh 0Fh
ACK Reply from Modbus RTU Slave
Slave No.
xxh
NAK Reply from Modbus RTU Slave
Slave No.
xxh
Communication Example
Write the following bit statuses to internal relays M605 through M624.
Purpose
M605 (LSB) through M614 (MSB) binary data: 6B
M615 (LSB) through M624 (MSB) binary data: 02
M605 → (60 – 0) × 8 + 5 + 1001 = 1486
Modbus address: 1486
1486 – 1 = 1485 = 5CDh
Communication frame address: 05CDh
Condition Slave No. 8
Modbus RTU Mode
•
Request from Modbus RTU Master
ACK Reply from Modbus RTU Slave
NAK Reply from Modbus RTU Slave
6-16
Address No. of Bits
xxxxh xxxxh
Function Code Address
0Fh xxxxh
Function Code Error Code
8Fh xxh
M610 M611 M612
(ON) (OFF) (ON)
M620 M621 M622
(OFF) (OFF) (OFF)
08 0F 05CD 0010 02 6B 02 (CRC)
08 0F 05CD 0010 (CRC)
08 8F xx (CRC)
FC6A S M S A
ERIES ICRO MART
Quantity of
Data
xxh
No. of Bits
xxxxh
M613 M614
(ON) (OFF)
M623 M624
(OFF) (OFF)
- -O T C
LL IN NE YPE OMMUNICATION
First Second
8 Bits 8 Bits
xxh xxh
M605 M606
(ON) (ON)
M615 M616
(OFF) (ON)
M FC9Y-B1730
ANUAL
Last
8 Bits
xxh
M607
(OFF)
M617
(OFF)