Omron NE1A Series - Calculating the Reaction Time; Reaction Time; Reaction Time Concepts

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Reaction Time Section 9-4
9-4 Reaction Time
9-4-1 Reaction Time Concepts
The reaction time is the time required to stop machine operation in a worst-
case scenario considering the occurrence of faults and failures in the safety
chain .
The reaction time is used to calculate the safety distance.
The reaction time is calculated for each safety chain. Some typical safety
chains are shown below.
1. Local Input - Local Output
2. Remote Input - Local Output
3. Local Input/Remote Output
4. Remote Input/Remote Output
Note There is no I/O response time required in the reaction time when operation is
normal. With the reaction time, the output shutoff time will be maintained even
if there are faults or failures in devices or the network.
9-4-2 Calculating the Reaction Time
Elements of the Reaction Time
The elements of the reaction time are given below for each safety chain.
1. Local Input – Local Output
2. Remote Input – Local Output
Safety
sensor/switch
NE1A Series
Actuator
Network
Safety I/O
Terminal
NE1A Series Actuator
Safety
sensor/switch
NE1A Series ActuatorNetwork
Safety I/O
Term i n a l
Safety
sensor/switch
NE1A Series
ActuatorNetwork
Network
Safety I/O
Terminal
Safety
sensor/switch
Safety I/O
Term i n a l
NE1A Series
Safety sensor/
switch
Actuator
Sensor/switch
reaction time
Local input/
local output
reaction
times (A)
Actuator
reaction time
NE1A SeriesSafety I/O Terminal Actuator
Network
reaction
time (G)
Input
reaction
time (E)
Sensor/switch
reaction time
Remote input/
local output
reaction
times (B)
Actuator
reaction time
Safety sensor/
switch