Omron PROFINET IO CJ1W-PRM21 Operation Manual page 126

Performance
110
Typical network configuration: 8 SmartSlice IO Devices connected, with the
typical configuration (see above).
Maximum network configuration: 126 SmartSlice IO Devices with minimum
configuration at an update rate of 126 ms, or 55 IO Devices with maximum
configuration at an update rate of 126 ms.
Section 7-5