Activating the Fast Counters via the I/O-Bus

The function “fast counters” is available in S500 I/O modules with firmware version V1.3 and later.

The function “fast counters” is also available in onboard I/Os of AC500 PM55x and PM56x. Each PM55x and PM56x contains up to 2 fast counters (according to the operating mode). For details on the configuration, refer to the section Configuration of Onboard I/O.

The digital I/O modules on the I/O bus contain two fast counters per module. If the I/O module does not have digital outputs, the corresponding counter modes are not valid. In case of an incorrect parameter setting, a diagnosis message is sent.

The fast counters are activated by setting the counter mode with the parameter “Fast counter” in the PLC configuration for the according I/O device (See PLC configuration / I/O bus).

Control of the fast counter(s) is performed via the I/O data contained in the control byte of the submodule “Fast counter”.