Mitsubishi Electric MELSEC iQ-R Series User Manual page 204

Important points about spooling
• If spool transmission and trace and fixed cycle sending messages are implemented at the same time, performance may
drop. It is recommended that trace / fixed-cycle sending messages are stopped during spool transmission.
• Spool data is saved as files on a memory card so the data is retained even after a power reset. However, if the power is cut
suddenly during spooling, the spool files may be corrupted. If the files are corrupted, spooling does not function normally.
Please restart the system after deleting the SPOOL.IDX file under the root folder of the memory card. In this case, spool
data cannot be recovered.
• If the "overwrite spool" is not implemented, the maximum number of spool items may be lower than the specified spool
maximum due to the size of messages to be spooled. When "overwrite spool" is implemented, operations are implemented
with the minimum guaranteed number of items.
• The SECS/GEM communication software does not turn OFF the sending request relay if message sending is not complete.
Accordingly, describe the handshake response monitoring timer processing of the SECS/GEM communication software at
the programmable controller CPU, and switch OFF the sending request trigger relay during a timeout. When the message
is subject to spooling at this time, the value of the spooling state notification (SpoolingState) is active.
• While the spooling state notification (SpoolingState) is active, the SECS/GEM communication software does not send a
message when the equipment attempts to send a primary message not subject to spooling. However, S1 and S9 related
messages are sent.
8 GEM COMPLIANT FUNCTIONS
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8.8 Spool Function (GEM / GEM advanced version)