Omron NE1A Series - Verifying the Reaction Time

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Reaction Time Section 9-4
Network reaction times #1 and #2 will be 24 ms each, based on a safety con-
nection EPI of 6 ms. The reaction times are obtained using the following equa-
tion:
Reaction time (ms) = Switch reaction time
+ Safety I/O Terminal input reaction time
+ Network reaction time #1
+ NE1A-SCPU01 remote input/remote output reaction time
+ Network reaction time #2
+ Safety I/O Terminal output reaction time
+ Actuator reaction time #2
= Switch reaction time
+ ON/OFF delay time (DST1-ID12SL-1) + 16.2
(= Input reaction time of DST1-ID12SL-1)
+ 24
+ 6
+ 24
+ 6.2 (= Output reaction time of DST1-MD16SL-1)
+ Actuator reaction time
= 76.4 + ON/OFF delay time (DST1-ID12SL-1)
+ Switch reaction time + Actuator reaction time
9-4-3 Verifying the Reaction Time
Always confirm the reaction time calculated for each safety change satisfies
the required specifications. If the reaction time exceeds the required specifica-
tions, consider the following items and correct the design of the network for
that reaction time requirements are satisfied.
• The network reaction time can be reduced by shortening the EPI. This,
however, will also reduce the network band that can be used for other
connections.
• The cycle time of the NE1A-series Controller is automatically calculated
based on the size of the program, the number of connections, and other
factors. The cycle time can be reduced by using separate NE1A-series
Controllers for safety chains that require high-speed reaction times.