Mitsubishi Electric MELSEC iQ-R Series User Manual page 318

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)  local 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 315 Transmission interval monitoring time)
TMpas: Transmission interval monitoring time of the Passive side ( Page 315 Transmission interval monitoring time)
LS: Communication cycle intervals (can be checked in the SW0060) ( Page 293 Communication cycle intervals)
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 24ms and the safety cycle time is 10ms.
24  2 = 12
The safety refresh monitoring time is 20, the smallest multiple of safety cycle time (10ms) which is greater than 12.
Ex.
Calculation example of b when the transmission interval monitoring time (TMact) is 24ms and the safety remote station
refresh response processing time is 2ms.
24  2 = 12
The value is the multiple of safety remote station refresh response processing time (2ms) so the safety refresh monitoring
time is 12.
• Calculate the communication cycle interval used in the calculation of the safety refresh monitoring time in
accordance with the conditions of the system used.
• When "Communication Destination" is set to "CR800-R" in "Safety Communication Setting" under "Basic
Settings" of the master station, the formula to calculate the safety refresh monitoring time differs. In this
case, refer to the manual of the communication destination.
• The Safety CPU may detect a safety communication timeout if the safety communications are affected by
noise. If required, add an integral multiple of ((TMact  2) + (TMpas  2)) to the 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".
APPX
316
Appendix 7 Processing Time