Allen-Bradley GuardLogix 5570

84 Rockwell Automation Publication 1756-UM022D-EN-P - May 2017
Chapter 5 Add, Configure, Monitor, and Replace CIP Safety I/O Devices
Method 2: Use the Maximum Observed Network Delay. If the system is run
for an extended period of time through its worst-case loading conditions, the
Network Delay Multiplier can be set from the Maximum Observed Network
Delay. This method can be used on an input or output connection. After the
system has been run for an extended period of time through its worst-case
loading conditions, record the Maximum Observed Network Delay.
The Network Delay Multiplier can be approximated by the following
equation:
[Maximum Observed Network Delay + Margin_Factor]  RPI
EXAMPLE Calculate the Network Delay Multiplier from Maximum
Observed Network Delay
If:
RPI = 50 ms
Maximum Observed Network Delay = 20 ms
Margin_Factor = 10
Then, the Network Delay Multiplier equals:
[20 + 10]  50 = 60%
Table 23 - Additional Resources
Resource Description
GuardLogix 5570 and Compact GuardLogix 5370 Controller
Systems Safety Reference Manual, publication
1756-RM099
Provides information on calculating reaction times.
Guard I/O™ DeviceNet Safety Modules User Manual,
publication
1791DS-UM001
Guard I/O EtherNet/IP Safety Modules User Manual,
publication
1791ES-UM001