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Chapter 9: Message transfers
9
Monitoring relay (COM = 20(H))
[Format]
COM = 20(H)
DSED = Segment (00 to 07, 10 to 2C(H)) See page 9-20.
DADRL, H = Byte address (0000(H) to FFFF(H)) See page 9-20.
BLOC = Bit position (00(H) to 07(H))
DATA = Read data (00(H): OFF, 01(H): ON)
[Function]
- Read the bit data (relay) shown in DSEG, DADR, and BLOC.
[Execution condition]
- Write enable mode : Mode 0, mode 1 and mode 2
- PC operation status : Stopping, operating
[Example]
- Monitor the ON/OFF status of relay number 04033.
Ë Command
Ë Response
COM DSEG DADR
L
DADR
H
BLOC
COM RSLT DSEG DADR
L
DADR
H
BLOC DATA
Bit 3
Bit 3
File 0
File 0
ON
Ë Command
Ë Response
20 00 03 01 03
20 00 00 03 01 03 01
File address
000403(8) = 0103(H)
File address
000403(8) = 0103(H)
Relay number 04033
Relay number 04033