Automating Manufacturing Systems - Process Control and ...

plc function ref - 34.7
CTU - CounT Up
A
CTU
COUNT UP
Counter
Preset
Accum.
C5:0
50
0
Description:
The counter accumulator will increase once each time the input goes from
false to true. If the accumulator value reaches the preset the done bit,
DN, will be set. The accumulator value will still increase even when the
done bit is set
Status Bits:
Registers:
CU
CD
DN
OV
UN
ACC
PRE
Will be true when the input is true
Not used for this instruction
Will be set when ACC >= PRE
Will be set if the counter value has gone above 32,767
Not used for this instruction
The total count
The maximum count before the counter goes on
Available on: Micrologix, PLC-5