Mitsubishi Electric MELSEC iQ-R Series User Manual page 118

Scenario transaction operation sequence
Programmable
controller CPU
Scenario start request
trigger on
Scenario start
request trigger
off
In the course of transaction operations within a scenario, the software refers to (for sending) or writes data to (for receiving)
the related register without controlling the trigger relay.
Be aware that the registration-destination register is overwritten every time a message is received.
7 BASIC FUNCTIONS
116
7.8 Scenario Definition
Shared memory/
Device
Transmission data
Reception data
Reception data
Transmission data
Transmission data
Reception data
Scenario start request
SECS/GEM communication
software
Start request trigger on
detection
SECS message
transmission
registration
registration
SECS message
transmission
SECS message
transmission
registration
trigger off
Host
Scenario
transaction
Ò
SECS message
Scenario
reception
transaction
Ó
SECS message
reception
Scenario
transaction
Ô
SECS message
reception