RES (Reset) Ladder Logic Instruction

Definition

The Reset instruction is used to reset Timers, Counters, and Control structures used in the ladder logic. Timer On and Timer Off instructions are normally reset when the preceding rung logic transitions from either true to false or false to true, however they can also be reset with the Reset instruction.

The only reset for the RTO timer is the Reset instruction.

The Count Up and Count Down instructions are reset with either the Reset instruction or by moving a 0 into the respective Accumulators.

Control structures are reset with the reset instruction.

List of possible arguments

  • COUNTER STRUCTURE             PRE DEFINED STRUCTURE
  • TIMER STRUCTURE                    PRE DEFINED STRUCTURE
  • CONTROL STRUCTURE             PRE DEFINED STRUCTURE

 

Note: When referencing a structure the tag name is sufficient. Do not reference an element of the structure. Example:  Correct- MY_TIMER    Incorrect- MY_TIMER.DN