Calculating And Verifying The Reaction Time; Concept Of Reaction Time - Omron DEVICENET SAFETY - SYSTEM CONFIGURATION 07-2009 System Configuration Manual

Calculating and Verifying the Reaction Time

2-3

Calculating and Verifying the Reaction Time

2-3-1

Concept of Reaction Time

Note
28
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.
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)
Safety
NE1A-SCPU01
sensor/switch
2. Remote Input – NE1A-series Controller Output
Safety DST1-series
sensor/switch I/O Terminal
3. NE1A-series Controller Input – Remote Output
Safety NE1A-SCPU01
sensor/switch
4. Remote Input – Remote Output
Safety DST1-series
sensor/switch I/O Terminal
Even if a fault or failure occurs in a safety chain, the output shutoff time is
ensured as the maximum reaction time.
Actuator
Network
NE1A-SCPU01
Network DST1-series
I/O Terminal
Network Network
NE1A-SCPU01
Section 2-3
Actuator
Actuator
DST1-series
Actuator
I/O Terminal