Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 37)

2Ć3
2.1.1 Input Parameters for the Count Up Down Instruction
This table lists the inputs for the CTUD instruction and the variable type and data
type/range that each input supports.
Parameter Description Variable Type Data Type/Range
EN When this input is true, the instruction is enabled.
When EN is false, the instruction is not executed and
ENO, QU, and QD are set false.
CU When the instruction is enabled and CR and LD are false,
a falseĆtrue transition of this input causes the value in
Current to be incremented by one.
This input is false when not connected.
Connect a Boolean input or output.
CD When the instruction is enabled and CR and LD are false,
a falseĆtrue transition of this input decrements the value in
Current by one.
This input is false when not connected.
CR When this input is true, the value in Current is reset to
zero.
This input is false when it is not connected.
See Resetting a Counter," section 2.2.
LD When this input is true and CR is false, the value in
Current is set equal to the value in CPreset.
This input is false when not connected.