Transmission Delay Time Of Safety Communications - Mitsubishi Electric MELSEC iQ-R Series User Manual

Transmission delay time of safety communications

The following are the formulas to calculate transmission delay time of safety communications.
• 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".
• When "Communication Destination" is set to "CR800-R" in "Safety Communication Setting" under "Basic
Settings" of the master station, the formula to calculate the transmission delay time of safety
communications differs. In this case, refer to the manual of the communication destination.
Transmission delay time
■Master station (safety station)  local station (safety station)
The following table lists the time between a safety device of the Safety CPU on the sending station turning on or off and that
on the receiving station turning on or off.
Calculation value
Normal value
Maximum value
SCsnd: Safety cycle time of the sending station ( MELSEC iQ-R CPU Module User's Manual (Application))
LS: Communication cycle intervals (can be checked in the SW0060) ( Page 293 Communication cycle intervals)
SCrcv: Safety cycle time of the receiving station ( MELSEC iQ-R CPU Module User's Manual (Application))
TMsnd: Transmission interval monitoring time of the sending station ( Page 314 Monitoring time for safety
communications)
■Master station (safety station)  remote station (safety station)
The following table lists the time between a signal input to the remote station (safety station) and a safety device of the Safety
CPU on the master station (safety station) turning on or off.
Calculation value
Normal value
Maximum value
SCmst: Safety cycle time of the master station (safety station) ( MELSEC iQ-R CPU Module User's Manual (Application))
LS: Communication cycle intervals (can be checked in the SW0060) ( Page 293 Communication cycle intervals)
SRref: Safety remote station refresh response processing time ( Manual for the remote station used)
TMrmt: Transmission interval monitoring time of the remote station (safety station) ( Manual for the remote station used)
SRin: Safety remote station input response time ( Manual for the remote station used)
■Master station (safety station)  remote station (safety station)
The following table lists the time between a safety device of the Safety CPU on the master station (safety station) turning on or
off and the output of the remote station (safety station) turning on or off.
Calculation value
Normal value
Maximum value
SCmst: Safety cycle time of the master station (safety station) ( MELSEC iQ-R CPU Module User's Manual (Application))
LS: Communication cycle intervals (can be checked in the SW0060) ( Page 293 Communication cycle intervals)
SRref: Safety remote station refresh response processing time ( Manual for the remote station used)
TMmst: Transmission interval monitoring time of the master station (safety station) ( Page 314 Monitoring time for safety
communications)
SRout: Safety remote station output response time ( Manual for the remote station used)
APPX
312
Appendix 7 Processing Time
Formula
SCsnd + LS + SCrcv + TMsnd
SCsnd + (LS  2) + (SCrcv  2) + TMsnd
Formula
SCmst + LS + SRref + TMrmt + SRin
(SCmst  2) + (LS  2) + SRref + TMrmt + SRin
Formula
SCmst + LS + SRref + TMmst + SRout
SCmst + (LS  2) + (SRref  2) + TMmst + SRout