Omron DEVICENET SAFETY - CONFIGURATION MANUAL 05-2005 System Configuration Manual page 64

Here, we allocate 70% of the network bandwidth to safety connections and 20% to standard connections.
From the calculation results, you can see the EPI for the safety connections can be set to 7 ms and the com-
munications cycle of the Standard Master can be set to 6 ms.
Following the calculation results, set the EPI of all safety connections set in the NE1A-SCPU01 to 7 ms.
Also, set the communications cycle of the CJ1W-DRM21 to 6 ms.
62 Section 3: Constructing a Safety Network