When programming a PLC, you often need to track what has previously happened. Shift registers allow you to do just that. The Click PLC has a shift register in the instruction set. We will discuss the shift register and look at an example.
The shift register instruction will move a range of consecutive bits. This movement is controlled by the clock input bit, which will trigger with each transition from off to on. The bits continually shift with the clock pulse until the end bit number. When the bit shifts past the last bit number, the bit information is lost. The data input will put a ‘1’ or a ‘0’ in the first bit of the shift register. (Note: We can also put bits on anywhere within the shift register.) Reset input will clear the shift register by placing a ‘0’ in each of the bits in the range.
More information can be obtained at our website. This includes all of the links mentioned in this video.
accautomation.ca/click-plc-sh...
PLC Program Example - Shift Register (Conveyor)
accautomation.ca/plc-programm...
• PLC Program Example - ...
Download the Click Programming software at the following address:
support.automationdirect.com/p...
There are several reasons why we are using the Click PLC. Here are just a few.
- Investment is low for the hardware, and the software is free
- Standalone PLC with built-in I/O
- Communication ability - Ethernet Port, RS232, RS485 - support for Modbus RTU, Modbus TCP, etc. protocols
- Ability to expand the system with various modules, including RTD and Thermocouple inputs directly.
www.accautomation.ca