Table of Contents
Advertisement
3-3-2
Calculating the Maximum Reaction Time
Reaction Time Components
Reaction time components are displayed for each safety chain.
(1) NE1A-SCPU01 Standalone System
Safety
sensor/switch
Sensor/switch
reaction time
(2) Remote Input - NE1A-SCPU01 Output
Safety
sensor/switch
Sensor/switch
reaction time
(3) NE1A-SCPU01 Input - Remote Output
Safety
sensor/switch
Sensor/switch
reaction time
(4) Remote Input - Remote Output
Safety
sensor/switch
Sensor/switch
reaction time
Maximum Reaction Time Formula
Item
A Local input/local output reaction time of the NE1A-
SCPU01 (ms)
B Remote input/local output reaction time of the
NE1A-SCPU01 (ms)
C Local input/remote output reaction time of the
NE1A-SCPU01 (ms)
D Remote input/remote output reaction time of the
NE1A-SCPU01 (ms)
E Input reaction time of the DST1-series I/O Terminal
(ms)
F Output reaction time of DST1-series I/O Terminal
(ms)
G Network reaction time (ms)
IMPORTANT:
Check the NE1A-SCPU01 cycle time, I/O refresh cycle time, and network reaction time in the Network Con-
figurator.
64
NE1A-SCPU01
Actuator
Local input/local
Actuator
output
reaction time
reaction time
(A)
NE1A-SCPU01
DST1-series
I/O Terminal
Input
Network
reaction time
reaction time
(E)
(G)
NE1A-SCPU01
DST1-series
I/O Terminal
Local
Network
input/remote
output
reaction time
(G)
reaction time
(C)
DST1-series
NE1A-SCPU01
I/O Terminal
Remote input/
Input reaction
Network
remote output
time
reaction time
(E)
(G)
In the SNC program, add the time for the NE1A-SCPU01 cycle time to the reaction time of
the safety chain when the output from a function block is fed back to the input side of the
function block.
Actuator
Remote
Actuator
input/local
output
reaction time
reaction time
(B)
Actuator
Output
Actuator
reaction time
reaction time
(F)
DST1-series
I/O Terminal
Network
reaction time
reaction time
(G)
(D)
Formula
ON/OFF delay + I/O refresh cycle
+ NE1A-SCPU01 cycle time x 2 + 2.5
NE1A-SCPU01 cycle time + 2.5
ON/OFF delay + I/O refresh cycle + NE1A-SCPU01
cycle time x 2
NE1A-SCPU01 cycle time
ON/OFF delay + 16.2
6.2 + Relay reaction time (DST1-MRD08SL-1 only)
Use the Network Configurator calculation result.
Section 3: Constructing a Safety Network
Actuator
Output
Actuator
reaction time
reaction time
(F)
Advertisement
Table of Contents
