1. PLC Counters Three types: Count Up Count Down Count Up/Down Used for:
MECH 1500
Three types:
Count Up
Count Down
Count Up/Down
Used for:
Count machine cycles for preventative maintenance and/or parts produced.
Applications of instructions are packaging, palletizing and production control

2. PLC Counters Count Up (CTU)–
MECH 1500
Count Up (CTU)–
increases count value by 1 each time the count up parameter goes from false to true.
When the count value is equal to or greater than the preset value, the CTU instruction’s output is energized.

3. PLC Counters Count down (CTD)–
MECH 1500
Count down (CTD)–
decreases count value by 1 each time the count down parameter goes from true to false.
When the count value is equal to or less than zero, the CTD instruction’s output is energized.

4. PLC Counters Count up/down (CTUD)–
MECH 1500
Count up/down (CTUD)–
increases or decreases count value by 1 each time the count up or count down parameter goes from false to true.
When the count value is equal to or greater than the preset value, the CTU instruction’s output is energized.
When the count value is equal to or less than zero, the CTD instruction’s output is energized.

5. PLC Counters
MECH 1500
Coil Format

6. PLC Counters
MECH 1500
Block Format

7. PLC Counters
MECH 1500
Location in Step 7

8. PLC Counters
MECH 1500