Omron DeviceNet Safety, Руководство по настройке системы

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Calculating and Verifying the Reaction Time Section 2-3
2-3 Calculating and Verifying the Reaction Time
The last step in designing the network is calculating the reaction time of safety
chains. The user must check that the reaction time in all the safety chains
meets the requirement specifications.
2-3-1 Concept of Reaction Time
Reaction time is the worst down time among the running devices considering
faults and failures in safety chains. The safety distance is calculated from
reaction time.
The reaction time is calculated for each safety chain. The typical combinations
of safety chains are as follows:
1. Standalone NE1A-series Controller (DeviceNet Communications Dis-
abled)
2. Remote Input – NE1A-series Controller Output
3. NE1A-series Controller Input – Remote Output
4. Remote Input – Remote Output
Note Even if a fault or failure occurs in a safety chain, the output shutoff time is
ensured as the maximum reaction time.
Safety
sensor/switch
NE1A-SCPU01 Actuator
Safety
sensor/switch
Network DST1-series
I/O Terminal
NE1A-SCPU01 Actuator
Safety
sensor/switch
NE1A-SCPU01 DST1-series
I/O Terminal Actuator Network
Safety
sensor/switch
DST1-series
I/O Terminal
NE1A-SCPU01
DST1-series
I/O Terminal
Actuator
Network Network