Operation of Shift Registers, Arithmetic Operations and Data Movement in PLC
1. The BSL command AB button for EQU command is an output instruction that loads data into a bit array one bit at a time. When the rung goes from false to true, the enable bit (EN bit 15) is set and the data block is shifted to the right (to a lower bit number) one-bit position. This command is equivalent to the BSR command except for the fact that the designated register shifts in the opposite direction
2. Most PLCs have arithmetic function capabilities. Basic PLC math instructions include add, sub- tract, multiply and divide to calculate the sum, difference, product, and quotient of the content of word registers. The PLC is capable of doing many arithmetic operations per scan period for fast updating of data
3. The MOV instruction moves a Source value to a Destination location. is an output instruction that moves a copy of a value from a Source to a desired Destination.
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