APPX
Appendix 7 Processing Time
347
A
Transmission delay time of safety communications
The following are the formulas to calculate transmission delay time of safety communications.
Transmission delay time
■Master station (safety station) or local 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.
SCsnd: Safety cycle time of the sending station ( MELSEC iQ-R CPU Module User's Manual (Application))
LS: Link scan time ( Page 341 Link scan time)
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 348 Transmission interval monitoring time)
■Master station (safety station) Remote device station (safety station) (input)
The following table lists the time between a signal input to the remote device station (safety station) and a safety device of the
Safety CPU on the master station (safety station) turning on or off.
SCmst: Safety cycle time of the master station (safety station) ( MELSEC iQ-R CPU Module User's Manual (Application))
LS: Link scan time ( Page 341 Link scan time)
SRref: Safety remote station refresh response processing time ( Manual for the remote device station used)
TMrmt: Transmission interval monitoring time of the remote device station (safety station) ( Manual for the remote device
station used)
SRin: Safety remote station input response time ( Manual for the remote device station used)
■Master station (safety station) Remote device station (safety station) (output)
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 device station (safety station) turning on or off.
SCmst: Safety cycle time of the master station (safety station) ( MELSEC iQ-R CPU Module User's Manual (Application))
LS: Link scan time ( Page 341 Link scan time)
SRref: Safety remote station refresh response processing time ( Manual for the remote device station used)
TMmst: Transmission interval monitoring time of the master station (safety station) ( Page 348 Transmission interval
monitoring time)
SRout: Safety remote station output response time ( Manual for the remote device station used)
■Master station (safety station) Intelligent device station (safety station)
The following table lists the time between a signal input to the intelligent device station (safety station) and a safety device of
the SIL2 Process CPU on the master station (safety station) turning on or off.
SCmst: Safety cycle time of the master station (safety station) ( MELSEC iQ-R CPU Module User's Manual (Application))
LS: Link scan time ( Page 341 Link scan time)
SRin: Input processing time of the intelligent device station (safety station) ( MELSEC iQ-R CC-Link IE Field Network
Remote Head Module User's Manual (Application))
Calculation value Formula
Normal value SCsnd + LS + SCrcv + TMsnd
Maximum value SCsnd + (LS 2) + (SCrcv 2) + TMsnd
Calculation value Formula
Normal value SCmst + LS + SRref + TMrmt + SRin
Maximum value (SCmst 2) + (LS 2) + SRref + TMrmt + SRin
Calculation value Formula
Normal value SCmst + LS + SRref + TMmst + SRout
Maximum value SCmst + (LS 2) + (SRref 2) + TMmst + SRout
Calculation value Formula
Normal value SCmst + LS + SRin
Maximum value (SCmst 2) + (LS 2) + SRin
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