Omron NE1A-SCPU01 - 07-2009 - Appendix 1: Application and Configuration Examples; Emergency Stop Application

229
Reaction Time Section 11-5
The node 2 (#2) cycle times will be as follows:
NE1A-SCPU01 cycle time = 7 ms
I/O refresh cycle time = 3.5 ms
The network reaction time will be 28 ms based on a safety connection EPI of
7 ms. The reaction time is obtained using the following equation:
Reaction time (ms) = Switch reaction time
+ NE1A-SCPU01 #1 local input/remote output reaction time
+ Network reaction time
+ NE1A-SCPU01 #2 remote input/local output reaction time
+ Actuator reaction time
= Switch reaction time
+ ON/OFF delay time (NE1A-SCPU01) + 6 + 6 × 2
+ 28
+ 7
+ 2.5
+ Actuator reaction time
= 55.5 + ON/OFF delay time (NE1A-SCPU01)
+ Switch reaction time + Actuator reaction time
■ Example 4: Remote Input - Remote Output
The following example shows calculating the reaction time from a remote
input to a remote output, for the NE1A-SCPU01 configuration shown in the
illustration.
NE1A-SCPU01 node configuration:
• Program: 1 Reset, 1 E-STOP, 1 External Device Monitor
• Standard Slaves: 2 connections
• Safety Masters: 3 connections (EPI = 6 ms)
• Safety Slaves: None
The cycle times read by the Network Configurator will be as follows:
NE1A-SCPU01 cycle time = 6 ms
I/O refresh cycle time = 6 ms
DeviceNet
NE1A-SCPU01
Switch
Safety Connection
Network reaction time #1 = 24 ms
Cycle time = 6 ms
I/O refresh cycle = 6 ms
Actuator
Safety Connection
Network reaction time #2 = 24 ms
DST1-ID12SL-1 DST1-MD16SL-1