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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
Actuator
Network
Safety I/O
Terminal
Safety
sensor/switch
NE1A Series
Actuator
Network
Network
Safety I/O
Terminal
Safety
sensor/switch
Safety I/O
Terminal
NE1A Series
Safety sensor/
switch
Actuator
Sensor/switch
reaction time
Local input/
local output
reaction
times (A)
Actuator
reaction time
NE1A Series
Safety 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
Summary of Contents for NE1A-SCPU01 - 07-2009
Page 3: ...iv...
Page 9: ...x TABLE OF CONTENTS...
Page 11: ...xii...
Page 15: ...xvi...
Page 70: ...35 Installation Section 3 1 Top Top Bottom Bottom...
Page 72: ...37 Installation Section 3 1 3 1 3 Dimensions and Weight Dimensions NE1A SCPU01 V1...
Page 85: ...50 Wiring Section 3 2...
Page 123: ...88 Explicit Message Communications Section 4 7...
Page 141: ...106 Safety Outputs Section 5 4...
Page 257: ...222 Connection Status Tables Section 10 8...
Page 261: ...226 NE1A series Controller Replacement Section 11 2...
Page 264: ...229 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Page 266: ...231 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 267: ...232 Appendix A Local Output Setting Example...
Page 269: ...234 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 270: ...235 Appendix A Local Output Setting Example...
Page 273: ...238 Appendix A Local Input and Test Output Setting Example Local Output Setting Example...
Page 275: ...240 Appendix A Programming Example Local Input and Test Output Setting Example...
Page 276: ...241 Appendix A Local Output Setting Example...
Page 289: ...254...
Page 293: ...258 Index...