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

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Transmission delay time of safety communications

The following are the formulas to calculate transmission delay time of safety communications.
• 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.
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 275 Communication cycle interval)
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 295 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 275 Communication cycle interval)
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 275 Communication cycle interval)
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 296 Transmission interval
monitoring time)
SRout: Safety remote station output response time ( Manual for the remote station used)
APPX
294
Appendix 6 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

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