IFM Electronic AC402S Programming Manual page 96

SmartPLC SafeLine AC4S with fieldbus interfaces
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Step 2: Calculate the response times of the safety function
► Make measurements for a real system.
► Ensure sufficient dimensioning of the watchdog times and task monitoring.
► Measure the maximum response time in all sections of the signal propagation path with safe
fieldbus communication or safe cross communication.

safe fieldbus communication (FSoE): output tMaxRespTimeMS of the function block
FSoEMaster

safe cross communication (Safety NetVars): output tMaxRespTime MS of the function block
NetVarReceiver
► Calculate the response time of the safety function with the measured values:

without safe cross communication:
-
AS-i input
-
Local input
tMaxRespTimeMS(FSoE_in) +
FSoE slave
2*T(SafetyTask) +
input
15 ms

with safe cross communication:
From device 1
30 ms +
AS-i input
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
15 ms
16 ms +
Local input
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
15 ms
tMaxRespTimeMS(FSoE_in) +
FSoE Slave
2*T(SafetyTask_Dev1) +
Eingang
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
15 ms
The formula in the table determine only the maximum response time of the devices. For the
calculation of the maximum process response time the delay times of the safety AS-i
sensors/actuators and the respective input/output devices have to be added additionally
(T(sensor) + T(input) and T(output) + T(aktuator)).
96
AS-i output
-
-
tMaxRespTimeMS(FSoE_in) +
2*T(SafetyTask) +
8 ms
AS-i output
30 ms +
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
8 ms
16 ms +
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
8 ms
tMaxRespTimeMS(FSoE_in) +
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
8 ms
Local output
30 ms +
2*T(SafetyTask) +
tMaxRespTimeMS(FSoE_out)
16 ms +
2*T(SafetyTask) +
tMaxRespTimeMS(FSoE_out)
tMaxRespTimeMS(FSoE_in) +
2*T(SafetyTask) +
tMaxRespTimeMS(FSoE_out)
To device 2
Local output
30 ms +
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
tMaxRespTimeMS(FSoE_out)
16 ms +
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
tMaxRespTimeMS(FSoE_out)
tMaxRespTimeMS(FSoE_in) +
2*T(SafetyTask_Dev1) +
tMaxRespTimeMS(SafeNetVars) +
2*T(SafetyTask_Dev2) +
tMaxRespTimeMS(FSoE_out)
43014
FSoE slave output
FSoE slave output