Delta AS Series Programming Manual page 500

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⑤ Record the counter value to the compared stack area for the leaving-work-station ones, when the signal is

For PLC with FW V1.06.00 (V1.06.00 included) or higher versions:

The following timing diagram shows executing the high-speed counter and filter (reading from right to left).

① PLC reads the current counter value and stores the value in a register.

② Drop the counter value: the number of filters read is less than the number of filters set.

③ Record the counter value to the compared stack area for the entering-work-station ones, when the signal is

④ Record the counter value to the compared stack area for the leaving-work-station ones, when the signal is

⑤ The number of filters

When the signal is rising- or falling-edge triggered, and the PLC completes processing the filters, the PLC reads the

high-speed counter value and adds one in the value of the head index. The PLC then records the entering and

leaving counter results for each work station. The compared counter result is the current counter value + reference

value + observational error. For either rising- or falling-edge triggered, the value of the head index is incremented.

The maximum value for the head index mx2 (the maximum number of objects).

The value of the head index is cyclically incremented, when the signal is rising- or falling-edge triggered and

completes processing the number of filters (the default for trigger input is OFF). The maximum value for the head

index is mx2 (the maximum number of objects). For example, if you set the number of objects to 10, the value of the

head index (default: 0) is incremented to 1, 2, 3 to 20 and then 1, 2, 3 to 20 repeatedly. When the value of the head

index is 0, it means no object has entered after executing the instruction. The PLC adds one to the value of the head

index, and then checks the value of the tail index. If the value (after adding one) in the value of the head index equals

the value of the tail index, the PLC cancels the addition and records the counter result.

When the instruction is executed and the state of the initial input is OFF, the rising-edge trigger corresponds to the

odd numbers of the head index value, and the falling-edge trigger corresponds to the even numbers of the head

index value.

Ch ap te r 6 Ap pl ie d Instruc ti ons

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