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Analog Click Click PLUS Inputs PLC PLC Basics PLC Learning Sensors

Click PLC Analog Input Non-Linear Scaling

The Click PLC has automatic linear scaling for the analog inputs and outputs. What if the analog input or output is not linear? How do you handle this in the PLC? Look at the following tank. We can measure the height, which is linear, but the volume will not because of the shape of the tank.
Click PLC Analog Input Non-Linear ScalingWe will look at an application to determine the volume in this tank. This will be based on the height of the liquid in the tank. We will then scale this non-linear volume of the tank to display the actual volume. Let’s get started.

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Articles BRX Do-More Counters Do-More Do-More Designer Inputs Outputs PLC PLC Basics PLC Learning Scan Timers

Timing Diagram NOT Just Used for a Timer

Logic circuits in a PLC ladder logic program are either on or off. The inputs change, which will affect the outputs. This can be expressed in a timing diagram. The timing diagram or chart will show you how the ladder logic program will respond to the changing states of the inputs and outputs.
Timing Diagram NOT Just Used for a Timer
This visual method is an excellent way of understanding how the PLC ladder logic functions. We will discuss a timing diagram and how it is used for timers, counters, and ladder logic. This will help in understanding or troubleshooting your PLC programs. Let’s get started.

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Articles BRX Do-More Counters Do-More EasyPLC Machine Simulator Inputs PLC PLC Basics PLC Learning

PLC Counter Programming – 3 Things to Know

PLC ladder logic counters are used in just about every PLC program. They will indicate how many times something has happened within the controller logic. Counters then can be used to trigger other outputs or items in the PLC. You can find counter applications in a variety of things every day.
PLC Counter Programming - 3 Things to Know
PLC Counter Programming - 3 Things to KnowWe will discuss three things you need to know when programming counters in the PLC. A sample program with a counter will be shown. This will have a 3D simulation with the PLC. Let’s get started.

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Articles Do-More Inputs Outputs PLC PLC Basics PLC Learning Scan

Ladder Logic (NO) Contact – 3 Things to Know

Normally open (NO) contacts or inputs in the PLC ladder logic program do not mean the same as a wired normally open switch. NO contacts on the ladder logic provide the logic condition for the rung to turn on the output.
Ladder Logic Normally Open (NO) Contact - 3 Things to KnowWe will be looking at three things about the normally open (NO) contact on our ladder logic program. The normally closed NC ladder logic contact will also be discussed at the end. Let’s get started.

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Inputs PLC PLC Basics PLC Learning Productivity 1000 Productivity 2000 Productivity 3000 Productivity Suite

Productivity 2000 PLC Ladder Logic Contacts

The Productivity Suite Software comprises more than 82 instructions divided into 14 categories. These instructions include NO / NC, NO Edge / NC Edge, and Compare. Contacts are one of these instructions to program your productivity PLC controller. Ladder logic contacts are in every PLC program.
Productivity 2000 PLC Ladder Logic ContactsWe will be looking at these instructions in the Productivity 2000 series PLC. We will also look at organizing your favorite instructions. This will make them easier to find when programming the productivity PLC. Let’s get started.

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BRX Do-More Do-More Inputs PLC PLC Basics PLC Learning Scan

BRX Do-More PLC High-Speed Input Pulse Catch


The High-Speed Input Pulse Catch will set an output that can be seen by the PLC ladder logic scan in response to an input pulse. Inputs that are too fast to reliably be seen by the ladder logic scan time will be seen.
BRX Do-More PLC High-Speed Input Pulse CatchThe BRX Do-More series of programmable logic controllers have built-in high-speed inputs. These inputs can function in Counter, Timer, or Pulse Catch modes. Every CPU will have either 6 or 10 high-speed inputs (HSI) available depending on the model. These inputs can be used for input frequencies from 0 to 250Khz. 250Khz represents 250000 input counts per second that can be coming from devices connected to your PLC like an encoder. Due to the speed of the inputs, they function on the BRX Do-More PLC asynchronous with the PLC scan time.
We will continue looking at the high-speed inputs on our BRX Do-More PLC, by looking at the pulse catch mode. The pulse catch mode will be set up using the Z phase of our incremental encoder. Pulses will be counted using the input directly in the ladder logic and using the pulse catch bit. Comparisons will be made between the two counts and an output will be turned on when different. Let’s get started.