Publication 1747-RM001G-EN-P - November 2008
2-2 Basic Instructions
About the Basic
Instructions
Basic instructions, when used in ladder programs, represent hardwired logic
circuits used for the control of a machine or equipment.
The basic instructions are separated into three groups: bit, timer, and counter.
Before you learn about the instructions in each of these groups, we suggest
that you read the overviews that follow:
• Bit Instructions Overview.
• Timer Instructions Overview.
• Counter Instructions Overview.
Bit Instructions Overview
Bit instructions operate on a single bit of data. During operation, the processor
may set or reset the bit, based on logical continuity of ladder rungs. You can
address a bit as many times as your program requires.
Bit instructions are used with the following data files.
• Output/Input Files
• Status File
• Bit File
• Timer File
TIP
Using the same address with multiple output
instructions is not recommended.
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