Advantech RS-485 user manual Features -- Counter Mode, Up/Down Counting, Bi-direction Counting

I/O Modules

Features -- Counter Mode

Up/Down Counting

The Up/Down Counter Function offers two types of counting: Up Couting (increasingly) and Down Counting (decreasingly).

Up Counting : when C0A+ and C0A- sense any input signals, the counter counts up.

Down Counting : when C0B+ and C0B- sense any input signals, the counter counts down.

On receiving Up and Down signal simultaneously, the counter will not perform each specific counting accordingly, but will remain at the previous counting value, since these simultaneous signals won't have any effect on counting values.

C0A+

C0A-

C0B+/D+

C0B-/D-

Figure 4-44: Wiring for Up/Down Counting

Note: If you need only one type of counting, connect C0A+ and C0A- for Up Counting only; or connect C0B+ and C0B- for Down Counting only.

Bi-direction Counting

For implementing Bi-derection Counting, you need to connect C0B+/ D+ and C0B-/D- to implement the control function for

Up/Down Counting.

4-44 ADAM-5000