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PLC Sequencer and Shift R...
Forum: PLC Talk
Last Post: PLCForum
01-31-2022, 06:16 PM
» Replies: 0
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  PLC Sequencer and Shift Register Instructions
Posted by: PLCForum - 01-31-2022, 06:16 PM - Forum: PLC Talk - No Replies

*Mechanical Sequencers
*Sequencer Instructions
*Sequencer Programs

For the Allen- Bradley line of controllers, sequencer commands may include the following:
SQO (Sequencer Output) —Is an output instruction that uses a file to control various output devices. 
SQI (Sequencer Input)—Is an input instruction that compares bits from an input file to corresponding bits from a source address. The instruction is true if all pairs of bits are the same. 
SQC (Sequencer Compare) —Is an output instruction that compares bits from an input source file to corresponding bits from data words in a sequence file. If all pairs of bits are the same, then a bit in the control register is set to 1. 
SQL (Sequencer Load) —Is an output instruction used to capture reference conditions by manually stepping the machine through its operating sequences. It transfers data from the input source module to the sequencer file. The instruction functions much like a file-to-word transfer instruction.

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