Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations User Manual
Page 88
Advanced Instruction Set
Chapter 6
6Ć31
Here is an explanation of each value:
Counter Address:
Address of the instruction in accumulated
value area of data table.
Current Step:
Position in sequencer table (accumulated
value of counter).
Seq Length:
Number of steps (preset value of the
counter).
Words per Step: Width of sequencer table.
File:
Starting address of sequencer table.
Mask:
Starting address of mask file.
Output Words:
Words controlled by the instruction.
Load Words:
Words fetched by the instruction.
Input Words:
Words monitored by the instruction.
Sequencer Input
Symbol: SEQ 1
Purpose: Compares input data to stored data for equality.
You can compare up to 64 inputs.
Syntax: programmed as an input instruction. May be programmed with a
sequencer output instruction.
You mask the unused input bits (chapter 10 explains the term mask).
The counter is externally controlled by the ladder diagram logic.
This instruction requires 5-8 words of your program.
Function: You must externally index the counter in your program.