Mitsubishi Electric MELSEC iQ-R Series User Manual page 129

Operation sequence during spool message sending
All spool sending is performed by the SECS/GEM communication software.
The spool outputting relay is ON during spool sending, and then switches OFF when complete. At this time, the spooling relay
is also OFF.
Programmable
controller CPU
(1) The spooling relay switches ON.
(2) The spooling outputting relay switches ON.
(3) The spool outputting relay and spooling relay switch OFF.
SECS/GEM communication
software
Spooled data request(S6F23)
Spooled data request response
(S6F24 (spooled data present))
(1)
Spooled message transmission
Spooled message response
(2)
Spooled message transmission
(3)
Spooled message response
Host
7 BASIC FUNCTIONS
7.10 Spooling Function (non-GEM version)
7
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