Reaction Time - Omron NE1A-SCPU01 - 07-2009 Operation Manual

Reaction Time

11-5 Reaction Time
11-5-1 Reaction Time Concepts
Note
11-5-2 Calculating the Reaction Time
Elements of the Reaction Time
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
Safety
NE1A Series
sensor/switch
2. Remote Input - Local Output
Safety
Safety I/O
sensor/switch
Terminal
3. Local Input/Remote Output
Safety
NE1A Series
sensor/switch
4. Remote Input/Remote Output
Safety
Safety I/O
sensor/switch
Terminal
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.
The elements of the reaction time are given below for each safety chain.
1. Local Input – Local Output
Safety sensor/
NE1A Series
switch
Local input/
Sensor/switch
local output
reaction time
2. Remote Input – Local Output
Safety sensor/
Safety I/O Terminal
switch
Sensor/switch
reaction
reaction time
time (E)
Actuator
Network NE1A Series
Safety I/O
Network
Terminal
Network NE1A Series
Actuator
Actuator
reaction time
reaction
times (A)
NE1A Series
Remote input/
Input Network
local output
reaction
reaction
time (G)
times (B)
Section 11-5
Actuator
Actuator
Safety I/O
Network
Terminal
Actuator
Actuator
reaction time
Actuator
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