d: Value rounds up the calculation results of the TMpas  2 to a multiple of the safety cycle time of the local station (if NZ2GFSS2-32D, safety refresh response

processing time)

Set the safety refresh monitoring time to 12.2ms to satisfy all in (1) to (4) above.

The following shows a calculation example for network number 2 and 3. According to Page 243 Safety refresh monitoring time

on CC-Link IE Field Network, all calculation formulas in (1) to (4) below must be satisfied.

(1) Safety refresh monitoring time  TMact + (TMpas  2) + (LS  2) - a = 9 + (8  2) + (0.78  2) - (9 - 6) = 11.56  11.6 [ms]

(2) Safety refresh monitoring time  (TMact  2) + TMpas + (LS  2) - c = (9  2) + 8 + (0.78  2)- (8 - 4) = 10.06  10.1 [ms]

(3) Safety refresh monitoring time > TMact = 9 [ms]

(4) Safety refresh monitoring time > TMpas = 8 [ms]

TMact: Transmission interval monitoring time for a station set to the active side

TMpas: Transmission interval monitoring time for a station set to the passive side

LS: Link scan time for the CC-Link IE Field Network

a: If a station is set to the active side is RJ71GF11-T2, then a = TMact - b. For other cases, a = 0.

b: Value rounds up the calculation results of the TMact  2 to a multiple of the safety cycle time of the master station.

c: If a station is set to the passive side is either RJ71GF11-T2 or NZ2GFSS2-32D, then c = TMpas - d. For other cases, c = 0.

d: Value rounds up the calculation results of the TMpas  2 to a multiple of the safety cycle time of the local station (if NZ2GFSS2-32D, safety refresh response

processing time)

Therefore, the safety refresh monitoring time shall be set to: 11.6ms.

■Calculation example of the safety data transmission time (maximum value)

The safety data transmission time (maximum value) is a transmission time of the CC Link IE Field Network from safety input

to safety output.

Safety data transmission time (maximum value) = ( SCcpu  3) + (SRref  4.5) +  RM + SRin + SRout + ( n  2) = (3 + 3)

 3 + (2  4.5) + (12.2 + 11.6 + 11.6) + 1.4 + 0.4 + (1.7 + 1.6 + 1.6)  2 = 74.0

SCcpu: Total value of the safety cycle time of the Safety CPU on the safety path (sum total of safety cycle time of the Safety CPU (1) and Safety CPU (2))

SRref: Safety remote station refresh response processing time

RM: Safety refresh monitoring time of the safety communications on the safety path ( Page 246 Calculation example of safety refresh monitoring time on

CC-Link IE Field Network)

SRin: Input response time of the safety remote I/O module

SRout: Output response time of the safety remote I/O module

n: This shall be 1.8, since it is (1) or (2) below, whichever smaller.

(1) RM - TMmst - (TMoth  2) + a = 12.2 - 9 - (9  2) + (9 - 6) = 1.7

(2) RM - (TMmst  2) - TMoth + c = 12.2 - (9  2) - 9 + (9 - 6) = 1.7

TMmst: transmission interval monitoring time of master station ( Page 244 Calculation example of CC-Link IE Field Network transmission time)

TMoth: transmission interval monitoring time of the local station or remote device station ( Page 244 Calculation example of CC-Link IE Field Network

transmission time)

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

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)

Calculation example of the maximum value of the safety response time

The following shows a calculation example for safety response time (maximum value)

Safety response time (maximum value) = DT1 + DT2 + Safety data transmission time = DT1 + DT2 + 74.0 [ms]

APPX

246

Appendix 2 Calculating Safety Response Time for System Connected to Multiple Safety CPUs

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