A lot of times when programming a PLC you 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 then 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 putting 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. https://accautomation.ca/click-plc-shift-register-instruction
00:00 Click PLC Shift Register Instruction
00:33 Click Shift Register Instruction Parts
02:08 Monitoring the Shift Register Bits
03:19 Adding Additional Inputs to a Shift Register
05:31 Click Shift Register Timing Chart
06:15 Shit Register Instruction Sample Program
Previously we discussed:
Click PLC System Hardware. http://accautomation.ca/click-plc-system-hardware/
Click PLC Installing the Software
http://accautomation.ca/click-plc-installing-the-software/
Click PLC Establish Communication
