Mitsubishi Electric MELSEC iQ-R Series User Manual page 317

Transmission interval monitoring time
The value of transmission interval monitoring time set in the master/local module must satisfy all of the following conditions.
Communication destination
Master station (safety station) or local station (safety station)
Remote station (safety station)
TM: Transmission interval monitoring time
SCown: Safety cycle time of the own station ( MELSEC iQ-R CPU Module User's Manual (Application))
SCoth: Safety cycle time of the communication destination
LS: Communication cycle intervals (can be checked in the SW0060) ( Page 293 Communication cycle intervals)
SRref: Safety remote station refresh response processing time of the communication destination ( Manual for the remote
station used)
• If the Safety CPU detects a safety communication timeout, check that the transmission interval monitoring
time satisfies the above formula.
• The Safety CPU may detect a safety communication timeout if the safety communications are affected by
noise. If required, add an integral multiple of the safety cycle time on the own station to the transmission
interval monitoring time.
• When the transmission interval monitoring time has changed, the safety refresh monitoring time must also
be changed to meet the conditions specified for the safety refresh monitoring time. ( Page 316 Safety
refresh monitoring time)
• In "Basic Settings" of the master station, when "Communication Period Setting" of the communication
destination in "Network Configuration Settings" is set to an option other than "Basic Period", multiply the LS
(communication cycle intervals) by the multiplier corresponding to the set option, which is specified in
"Multiple Period Setting" under "Communication Period Setting".
Condition
• TM  SCown  3
• TM  SCoth  2 + LS  2
• TM  SCown  3
• TM  SRref  2 + LS  2
APPX
Appendix 7 Processing Time
A
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