Omron NE1A-SCPU01 - 07-2009 - Page 260

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Reaction Time Section 11-5
3. Local Input - Remote Output
4. Remote Input - Remote Output
Reaction Time Calculation
IMPORTANT If an output from a function block is fed back to the input side of the same
function block, the cycle time of the NE1A-series Controller must be added to
the reaction time for the safety chain.
Reaction Time Calculation Examples
■ Example 1: Local Input – Local Output
The following example shows calculating the reaction time from a local input
to a local output for the NE1A-SCPU01 configuration shown in the illustration.
NE1A-SCPU01 configuration:
• Program: 1 AND (2 inputs)
• Standard Slaves: 2 connections
• Safety Masters: None
• Safety Slaves: None
NE1A Series Safety I/O Terminal Actuator
Network
reaction
time (G)
Local input/
remote output
reaction
time (C)
Sensor/switch
reaction time
Output
reaction
time (F)
Actuator
reaction time
Safety sensor/
switch
Item Formula
A Local input/local output reaction time (ms) at NE1A-
SCPU01
= ON/OFF delay time + I/O refresh cycle
+ NE1A-SCPU01 cycle time × 2 + 2.5
B Remote input/local output reaction time (ms) at
NE1A-SCPU01
= NE1A-SCPU01 cycle time + 2.5
C Local input/remote output reaction time (ms) at
NE1A-SCPU01
= ON/OFF delay time + I/O refresh cycle
+ NE1A-SCPU01 cycle time × 2
D Remote input/remote output reaction time (ms) at
NE1A-SCPU01
= NE1A-SCPU01 cycle time
E Input reaction time (ms) at Safety I/O Terminal = ON/OFF delay time + Input reaction time
F Output reaction time (ms) at Safety I/O
Te rm in al
= Output reaction time
G Network reaction time (ms) = Result of Network Configurator calculation
NE1A SeriesSafety I/O Terminal Safety I/O Terminal Actuator
Network
reaction
time (G)
Remote
input/remote
output
reaction
times (D)
Input
reaction
time (E)
Network
reaction
time (G)
Sensor/switch
reaction time
Actuator
reaction time
Safety sensor/
switch
Output
reaction
time (F)
DeviceNet
NE1A-SCPU01 Actuator
Cycle time = 4 ms
I/O refresh cycle = 4 ms
Switch