Example 1 (typical)

A typical entire module consists of a CI501-PNIO with one DC532 and one AX521. This constellation contains 21 bytes input data and 15 bytes output data. The RT telegram is sent in both directions with a time of 6.4 µs.

Bus cycle time = 1 ms

ReductionRatio (RR) = 1

RT transmission time = 1 ms -30 % = 700 µs

Number of IO devices = 700 µs / (6.4 µs + 6.4 µs) = 55

You can operate with up to 55 IO devices in one network and you still have enough reserves for the non-real-time channel.

The reserve of the real-time and non-real-time channel is decreased by using more than 55 IO devices. (With 78 IO devices, there are no reserves left.)