Mitsubishi Electric MELSEC iQ-R Series User Manual page 298

Transmission interval monitoring time
The value of transmission interval monitoring time set in the Motion 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 275 Communication cycle interval)
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 296 Safety
refresh monitoring time)
• When "Communication Period Setting" of the communication destination sets to the setting other than
"Basic Period" in "Network Configuration Settings" under "Basic Settings" of the master station, multiply the
multiplication specified in "Multiple Period Setting" under "Communication Period Setting" of "Basic
Settings" by LS (Communication cycle intervals) as settings.
Safety refresh monitoring time
Set the safety refresh monitoring time at the Active side station.
Set a value that satisfies all of the following conditions.
• Master station (safety station)  remote station (safety station)
Condition
• RM  TMact + (TMpas  2) + (LS  2) - a
• RM  (TMact  2) + TMpas + (LS  2) - c
• RM > TMact
• RM > TMpas
RM: Safety refresh monitoring time
TMact: Transmission interval monitoring time of the Active side (Page 296 Transmission interval monitoring time)
TMpas: Transmission interval monitoring time of the Passive side (Page 296 Transmission interval monitoring time)
LS: Communication cycle intervals (can be checked in the SW0060) (Page 275 Communication cycle interval)
a: TMact-b (CC-Link IE TSN-compatible MELSEC products are on the Active side. Otherwise this value is 0.)
b: A smallest multiple of safety cycle time which is greater than TMact  2
c: TMpas-d (CC-Link IE TSN-compatible MELSEC products are on the Passive side. Otherwise this value is 0.)
d: A smallest multiple of safety cycle time (safety remote station refresh response processing time for the safety remote I/O
module) which is greater than the calculation result of TMpas  2
Ex.
Calculation example of b when the transmission interval monitoring time (TMact) is 24 ms and the safety cycle time is 10 ms.
24  2 = 12
The safety refresh monitoring time is 20, the smallest multiple of safety cycle time (10 ms) which is greater than 12.
APPX
296
Appendix 6 Processing Time
Condition
• TM  SCown  3
• TM  SCoth  2 + LS  2
• TM  SCown  3
• TM  SRref  2 + LS  2