Command/Response Method - Omron SYSMAC FH Series User Manual

1 Overview
1-4-2

Command/Response Method

● Parallel
Commands are input to the Sensor Controller by turning the DI signals (DI0 through DI7) ON and OFF.
Since there is no direct response for these commands, so check the ACK signal whether or not a com-
mand was accepted.
The command code is input with signals DI0 through DI6, and the command is performed by turning
DI7 ON.
DI7 DI6 DI5
Execution Command
● PLC Link, EtherNet/IP, EtherCAT, or PROFINET
By storing control commands from the PLC to the Sensor Controller and responses from the Sensor
Controller to the PLC into the PLC's I/O memory, command and response control signals are ex-
changed. This enables you to control the Sensor Controller using commands such as single measure-
ment and scene switch without any sequence control such as issuing communication commands from
the PLC.
Memory Areas Used by the Command/Response Method
Command
Area
Response
Areas
(communications areas)
(1) Command Area
(5) Response Area
Flow of Communications between the PLC and the Sensor Controller
(1) The PLC (the user) writes a control command to a specified PLC's I/O memory area (the Command Area).
(2) The PLC (the user) then turns the EXE bit ON to send the control command to the Sensor Controller.
(3) The Sensor Controller perfoms the received control command.
(4) The Sensor Controller returns a response to the PLC after the control command was performed.
(5) The PLC (the user) stores the response in a specified PLC's I/O memory area (the Response Area).
The communication commands depend on the communication protocol used.
For details, refer to A-1-3 Command List on page A - 7.
1 - 16
DI4 DI3 DI2 DI1 DI0
Command information
You write the control commands to execute for the Sensor Controller to this area.
You read the performed results of the control commands written in the Command Area from this
area.
PLC
CPU Unit
I/O memory
FH/FHV Series Vision System User's manual for Communication Settings (Z342-E1)
Sensor Controller
(2) Command
• Switch Scene Number
• Single Measurement, etc.
(4) Response
OK, etc.
(3) Command is processed.