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350
APPX
Appendix 7 Processing Time
Safety refresh monitoring time
■
System using the Safety CPU
Set the safety refresh monitoring time at the Active side station.
Set a value that satisfies all of the following conditions.
RM: Safety refresh monitoring time
TMact: Transmission interval monitoring time of the Active side (
Page 348 Transmission interval monitoring time)
TMpas: Transmission interval monitoring time of the Passive side (
Page 348 Transmission interval monitoring time)
LS: Link scan time (
a: TMact - b (enables only when the RJ71GF11-T2 is Active side. Otherwise this value is 0.)
b: A smallest multiple of safety cycle time which is greater than TMact
2
c: TMpas-d (enabled only when the RJ71GF11-T2 or NZ2GFSS2-32D is on the Passive side. Otherwise this value is 0.)
d: A smallest multiple of safety cycle time (safety refresh response processing time for the NZ2GFSS2-32D) which is greater
than TMpas
2
Ex.
Calculation example of b when the transmission interval monitoring time (TMact) is 24ms and the safety cycle time is 10ms.
24
2 = 12
The value of b is 20, the smallest multiple of safety cycle time (10ms) which is greater than 12.
• Calculate the link scan time used in the calculation of the safety refresh monitoring time in accordance with
the conditions of the system used. If disconnection and return of stations are not considered in a system
using the Safety CPU, safety refresh monitoring time and safety response time can be shortened by setting
Kd (maximum data link processing time when the station is disconnected from or returned to the network) to
0. However, the Safety CPU may detect a safety communication timeout if the station is disconnected or
returned. If the Safety CPU detects a safety communication timeout, change the safety refresh monitoring
time to a greater value.
• The Safety CPU may detect a safety communication timeout if the safety communications are affected by
noise. If required, add an integral multiple of ((TMact
2) + (TMpas
2)) to the safety refresh monitoring
time.
■
System using the SIL2 Process CPU
Set the safety refresh monitoring time at the Active side station.
Set a value that satisfies all of the following conditions.
RM: Safety refresh monitoring time
TMact: Transmission interval monitoring time of the Active side (
Page 348 Transmission interval monitoring time)
TMpas: Transmission interval monitoring time of the Passive side (
Page 348 Transmission interval monitoring time)
LS: Link scan time (
Tc: System switching monitoring time setting value [ms]
SS: Sequence scan time of the SIL2 Process CPU [ms]
Condition
• RM
TMact + (TMpas
2) + (LS
2) - a
• RM
(TMact
2) + TMpas + (LS
2) - c
• RM > TMact
• RM > TMpas
Condition
■
For a redundant master station
• RM > 310 + (3
LS) + Tc + SS + TMact
• RM > 310 + (3
LS) + Tc + SS + TMpas
■
For a redundant line
• RM > 5 + Tc + (3
LS) + SS + TMact
• RM > 5 + Tc + (3
LS) + SS + TMpas
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