====== CTUD Box Function ======

**Count Up/Down Counter**

Category: [[en-us_products:mpino_studio2:box_functions:counter|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 |

{{ :en-us_products:mpino_studio2:counter-ctud-timing.svg?1000 |CTUD input, current value, and done state }}

===== 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 =====

  * [[en-us_products:mpino_studio2:box_functions:counter:ctu|CTU View details]] — Count Up Counter
  * [[en-us_products:mpino_studio2:box_functions:counter:ctd|CTD View details]] — Count Down Counter