Table of Contents
CTUD Box Function
Count Up/Down Counter
Category: Counter Box Functions
Behavior
While the left condition is ON, a rising edge on the up input adds one and a rising edge on the down input subtracts one. If both rise in the same scan, the value does not change.
Syntax and Arguments
Syntax: CTUD C11 M0 M1 3
- Target — counter memory C<n> (16-bit) or DC<n> (32-bit)
- up — the bit contact to increment (e.g. P0/M1)
- down — the bit contact to decrement (e.g. P1/M2)
- preset — count at which the done bit turns ON (an integer, not time)
Behavior Example
| Run condition | Before | Command entered | Expected result |
|---|---|---|---|
| Left condition ON | C11=0 | CTUD C11 M0 M1 3 | M0 ×2, M1 ×1 → C11=1 |
Cautions
- A counter changes once per rising edge of the left condition. On MPINO-8A4R(T)-S, C0 through C10 are mapped to board functions, so use C11 or later for a counter.
Box Functions in the Same Category
- CTU View details — Count Up Counter
- CTD View details — Count Down Counter