Using The Spool Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

9.6

Using the Spool Function

Series
MELSEC-Q series
MELSEC iQ-R series
Of the messages to be reported to the host, the spool function temporarily saves messages that must not be lost due to
communication failure at the equipment, and then reports the saved messages to the host when communication is restored.
Configure messages that must not be lost (primary messages) to be subject to spooling.
When a message subject to spooling fails to be sent, the message is saved in the spool queue. Once communication is
restored, the message saved in the spool queue is sent back or discarded by a Spooled data request (S6F23) from the host.
Operation
The following figure shows the spooling operation sequence.
Both Message 1 and Message 2 are configured for spooling.
Programmable
Controller CPU
Message 1 transmission request trigger ON
Spool output relay ON
Message 2 transmission reque trigger ON
Message 2 transmission request trigger
OFF
Spool output relay OFF
SECS/GEM communication software
Non-GEM version


SECS/GEM communication
software
Sending failure
Messages subject to
spooling are saved to the
CF card/SD card
Messages subject to
spooling are saved to the
CF card/SD card
Spooling data request (S6F23)
Spooling data request response
Message 1 sent response
Message 2 sent response
9 SECS/GEM COMMUNICATION SOFTWARE KNOWLEDGE
GEM version


Host
Message 1 sent
Message 2 sent
9.6 Using the Spool Function
GEM advanced version


247
9