Omron DEVICENET SAFETY - SYSTEM CONFIGURATION 07-2009 System Configuration Manual page 58

Allocating Network Bandwidth Usage and Calculating the Best EPI
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those connections that do not need a fast response (e.g., for door
switches not used in hazardous areas).
Refer to the reaction time listed in the EPI field to check what the reac-
tion time will be for each safety connection EPI setting.
Note Set the EPI for each safety connection longer than Safety Network
Controller cycle time. If the EPI is shorter, errors will occur when the
safety connection parameters are downloaded and the download
will fail.
• Changing Standard Master Communications Cycle Times
The value calculated as the best average cycle time is the best communi-
cations cycle time for the Standard Master.
Set the calculated value as the Standard Master communications cycle
time.
10. Reconfirm the bandwidth usage rate.
If the EPI settings in the safety connection parameters or the Standard
Master communications cycle time setting has been changed based on the
calculation results, check that the network bandwidth usage when safety
connections are used, displayed at the bottom of the Network Configura-
tion Window, is less than the value input in the Calculate EPI Dialog Box.
It is particularly important to check the bandwidth usage rate if the best av-
erage EPI has been adjusted for each connection rather than applied as a
batch setting.
Note The EPI is set in 1-ms units, so the network bandwidth usage rate
may be smaller than the input value if the calculation result is input
directly.
11. Perform a test to ensure that there are no problems with the set values.
Section 2-2