236
APPX
Appendix 1 Calculating Safety Response Time for System Configured with a Safety CPU
Method for calculating safety response time of CC-Link IE Field
Network
CC-Link IE Field Network transmission time
The following shows a calculation formula for the transmission time of the CC-Link IE Field Network from safety input to safety
output.
(SCcpu 3) + (SRref 4.5) + (RM 2) + SRin + SRout + (n 4)
SCcpu: Safety cycle time of the Safety CPU
SRref: Safety remote station refresh response processing time
*1
RM: Safety refresh monitoring time
SRin: Safety remote I/O module input response time
*1
SRout: Safety remote I/O module output response time
*1
n: The smaller value of (1) and (2) below
(1) RM - TMmst - (TMrmt 2) + a
(2) RM - (TMmst 2) - TMrmt + c
TMmst: Transmission interval monitoring time of the master station
TMrmt: Transmission interval monitoring time of the remote I/O module
a: If a station set to active side is the RJ71GF11-T2, then a = TMmst - b. For other cases, a = 0.
b: Value rounds up the calculation results of the TMmst2 to a multiple of the safety cycle time of the master station.
*2
c: If a station set to passive side is either the RJ71GF11-T2 or Z2GFSS2-32D, then c = TMrmt - d For other cases, c = 0.
d: Value rounds up the calculation results of the TMrmt 2 to a multiple of the safety cycle time of the local station (if
NZ2GFSS2-32D, safety refresh response processing time)
*2
*1 For the safety remote I/O module used, refer to the user's manual.
*2 Calculation examples for b and d
When transmission interval monitoring time = 24ms, and safety cycle time = 10ms, the calculation result is 20, rounded up 24 2 = 12 to
a multiple of 10.
To Next Page
Loading...
