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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.

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Click PLC PLC Basics PLC Learning

Click PLC High Speed Counting – Part 2

The Ethernet Click PLC high-speed counter has seven different modes of operation. In Part 1 we discussed the High Speed Count Mode, Interval Measurement Mode,
Duration Measurement Mode and Frequency Measurement Mode.
Click PLC High Speed Counting – Part 2
This 100 kHz counter can accept Up, Down, Up/Down, Pulse/Direction, or Quadrature (with Z) inputs.
We will be looking at the last three different high-speed counter modes available in the click. (External Interrupt, Pulse Catch, Filter) This is all set up through a user-friendly graphical user interface. We will also combine the Frequency Measurement and the High-Speed Count in one application. Let’s get started!

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Click PLC PLC Basics PLC Learning

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!