Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual page 165

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OSR and OSF Instructions Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 82.
Parameter
Storage Bit •
Output Bit • • •
These instructions use two parameters, Storage Bit and Output Bit.
• Storage Bit - This is the bit address that remembers the rung state
from the previous scan.
• Output Bit - This is the bit address which is set based on a
false-to-true (OSR) or true-to-false (OSF) rung transition. The Output
Bit is set for one program scan.
To re-activate the OSR, the rung must become false. To re-activate the
OSF, the rung must become true.
OSR Storage and Output Bit Operation
Rung State Transition
false-to-true (one scan)
true-to-true
true-to-false and false-to-false
OSF Storage and Output Bits Operation
Rung State Transition
true-to-false (one scan)
false-to-false
false-to-true and true-to-true
Addressing Modes and File Types can be used as shown in the following
table:
Data Files
•
• • •
Relay-Type (Bit) Instructions
Storage Bit
bit is set
bit is set
bit is reset
Storage Bit
bit is reset
bit is reset
bit is set
Function Files
Publication 1763-RM001C-EN-P - October 2009
165
Output Bit
bit is set
bit is reset
bit is reset
Output Bit
bit is set
bit is reset
bit is reset
Address
Address Level
Mode
• •
• •