Most programmable logic controller (PLC) programs will include a counter instruction. The Productivity 2000 Series PLC has two different counter instructions for your program. These can be used in several different ways to adapt to your application. Basically, counters are used to count up or down to a specific limit. When the limit is reached, the output is turned on.
Counters can be made from a few different instructions from the PLC. The math instruction uses the one-shot (leading edge) input to add 1 to an internal register to keep track of the counter's value. A comparison is used to compare this counter value to a set value (SV). The output is turned on if it is greater than or equal. Another input is used for the reset of the counter value. Copy is used to move the reset value into the counter value. This reset will usually override the counting application. Breaking down the counter's essential operation will help us understand our application and how we can utilize counters in our automation programs.
The productivity suite software has Simple Counters (SCNT) and the Counters (CNT) instructions. We will be reviewing these instructions and looking at how to implement them in our ladder logic program. Let's get started.
Detailed information can be found on our website. The post for this video is located here:
https://accautomation.ca/productivity-2000-plc-ladder-logic-counter/
00:00 Productivity 2000 PLC Ladder Logic Counter
00:25 What is a Counter? - Components
01:39 Simple Counters (SCNT)
04:12 Counters (CNT)
The Productivity 2000 Series PLC is located here:
https://accautomation.ca/series/productivity-2000-series-plc-p2000/
Previously in this Productivity 2000 series PLC, we have discussed:
P2000 Hardware Features
https://accautomation.ca/productivity-2000-series-plc-p2000-hardware/
https://youtu.be/83MfQK7fzdk
Productivity Suite Programming Software Install
