Tag Archives: programmable logic controller basics

Click PLC High Speed Counting – Part 1

The Click PLC family has been updated, and now has the ability to use high speed counting. This is available on all of the Ethernet units that have DC inputs. The faster processor on the Ethernet unit (3 to 10 times faster than the basic unit) allows this capability. There are seven (7) different modes of operation for the high speed counter available so adaption to your automation solution is easy. The input can count Up, Down, Up/Down, Pulse/Direction or Quadrature (with Z). Maximum speed on the high speed counter inputs are 100 kHz. That is 100,000 pulses per second.
Click PLC High Speed Counting – Part 1
We will be looking at the different high speed counter modes available in the click. This is all setup through a user friendly graphical user interface. Let’s get started! Keep on Reading!

Click PLC HMI Rotary Encoder Dial Input

We will now look at the programming and wiring of a rotary encoder to the Click PLC input. Rotary encoders are modern digital devices that have taken over from the potentiometer in stereos and many other applications. This is because of their fine digital control and they can fully rotate without end stops. We can connect the rotary encoder into the PLC using just two digital inputs. This human-machine interface (HMI) has the advantage over touch screens and other methods of control into the PLC. The operator can control the rate and setpoint with the dial (rotary encoder) without looking at the control. This will allow the operator to concentrate on other tasks.
Click PLC HMI Rotary Encoder Dial Input
Click PLC HMI Rotary Encoder Dial InputClick PLC HMI Rotary Encoder Dial Input
We will be connecting a rotary encoder with dial into the Click PLC. The signals being sent from the rotary encoder will be explained. Different methods of programming this input in our PLC will be discussed. Let’s get started. Keep on Reading!

Click PLC Update Firmware – Software

Firmware is usually PLC operating system code that is written into a read only memory. The BIOS (Basic Input Output System) of a PC (personal computer) is a good example of firmware. It provides the low level interface between the hardware and software. The Click PLC firmware comes with the programming software.
Click PLC Update Firmware
We will be updating our firmware of our Click PLC from 2.10 to 2.30. Let’s get started! Keep on Reading!

BRX Do-More PLC Analog IO – System Configuration

We will now configure and operate Analog inputs and outputs on our BRX Do-More controller. One of the features of the BRX Series PLC is the ability to expand its capability to fit your application. This is easily done by “snap-on” modules that will fit on the side of the BRX MPU (Multi-Processor Unit). As we have seen before in the BRX PLC System Configuration post we can add additional discrete inputs and outputs. Automation Direct now offers Analog Voltage and Analog Current input and output modules. These modules come as an 8 point channel unit. There is also a 4 point thermocouple input module also available. We will be configuring, scaling and programming the Analog input and output Voltage modules for our BRX PLC. Let’s get started. Continue Reading!

The 7 Essential Parts of a PLC System

We will now look at the parts of a PLC system. When I was in school PLCs were just in their infancy. We were taught that the PLC consisted of the central processing unit (CPU), analog and digital inputs, and outputs. Everything was programmed with dedicated handheld devices and/or software devices on specialized hardware. We now have modern PLC systems that are capable of so much more. Let’s look at how we can now break up these modern PLC systems into the seven essential components.

Inputs and Outputs (I/O)
Analog I/O
Specialty I/O
Programming Tools
Networking Continue Reading…