Fast Counters in the Onboard I/Os

General Description of the Fast Counter in Onboard I/O of CPU PM554 and PM564

The Onboard I/O of each CPU module has 2 integrated fast counters (channel 0 and 1). The fast counter can work in normal counter mode and A/B track counter mode. The normal counter detects the rising edge of the counter input. It will increase or decrease the count value at every rising edge. The A/B track counter is used to count the signal from a motion sensor. The counter can count with single phase, double phases or quad phases. The behavior of the A/B track counter is described at the following chapter.

The counters can be activated by setting the channel parameter of channel 0 in PLC configuration. If the fast counter is activated, digital input channel 0 and/or 1 can be set as counter input according to the different modes. The counters can be deactivated by configuration parameter.

Note

The Fast Counters cannot be used together with interrupt inputs at the same time.

• Counting Modes
• Configuration
• Operating the Fast Counter with User Program