Method For Calculating Safety Data Transmission Time Of The Cc-Link Ie Field Network - Mitsubishi Electric MELSEC iQ-R Series Safety Manual

Method for calculating safety data transmission time of the CC-
Link IE Field Network
Transmission time of the CC-Link IE Field Network
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 + SRin + SRout +  n  2
Total value of the safety cycle time of the  SCcpu: Safety CPU on the safety path
SRref: Safety remote station refresh response processing time
RM: Total value of safety refresh monitoring time of the safety communications
SRin: Input response time of the safety remote I/O module
SRout: Output response time of the safety remote I/O module
n: Total value of the following values of safety communications
n: The smaller value of (1) and (2) below
(1) RM - TMmst - (TMoth  2) + a
(2) RM - (TMmst  2) - TMoth + c
RM: Safety refresh monitoring time on the communication path
TMmst: Transmission interval monitoring time of the master station
TMoth: transmission interval monitoring time of the local station or remote device station
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 TMmst  2 to a multiple of the safety cycle time of the master station.
c: If a station set to passive side is either the RJ71GF11-T2 or NZ2GFSS2-32D, then c = TMoth - d For other cases, c = 0.
d: Value rounds up the calculation results of the TMoth  2 to a multiple of the safety cycle time of the local station (if
NZ2GFSS2-32D, safety refresh response processing time)
*1 All Safety CPUs used for safety communications from safety input devices to safety output devices
*2 For the safety remote I/O module used, refer to the user's manual.
*3 Safety communications between safety remote I/O module with connected safety input device and Safety CPU, safety communications
between safety remote I/O module with connected safety input device and Safety CPU, and safety communications between Safety
CPUs installed in between.
*4 Calculation examples for b and d
When transmission interval monitoring time = 24 ms, and safety cycle time = 10ms, the calculation result is 20, rounded up 24  2 = 12
to a multiple of 10.
For details, refer to the following.
 CC-Link IE Field Network Remote I/O Module (With Safety Functions) User's Manual
Transmission interval monitoring time of the CC-Link IE Field Network
Transmission interval monitoring time is used for calculation of the CC-Link IE Field Network transmission time. For
calculation method, refer to the following.
Page 237 CC-Link IE Field Network transmission interval monitoring time
Safety refresh monitoring time on CC-Link IE Field Network
Safety refresh monitoring time is used for calculation of the CC-Link IE Field Network transmission time. For calculation
method, refer to the following.
Page 238 Safety refresh monitoring time on CC-Link IE Field Network
Link scan time of the CC-Link IE Field Network (LS)
Link scan time is used for calculation of the CC-Link IE Field Network transmission time. ( Page 239 CC-Link IE Field
Network link scan time (LS))
*2
*2
*2
*4
Appendix 2 Calculating Safety Response Time for System Connected to Multiple Safety CPUs
*1
*3
on the safety path
*3
on the safety path
*4
A
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