Bit Shift Right (Bsr); Relay Ladder; Control Structure - Allen-Bradley Logix5000 Reference Manual

Chapter 9 Array (File)/Shift Instructions (BSL, BSR, FFL, FFU, LFL, LFU)

Bit Shift Right (BSR)

Mnemonic Data Type
.EN BOOL
.DN BOOL
.UL BOOL
.ER BOOL
.LEN DINT
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The BSR instruction shifts the specified bits within the Array one position right.
Operands:

Relay Ladder

Operand
Array
Control
Source bit
Length

CONTROL Structure

Description
The enable bit indicates that the BSR instruction is enabled.
The done bit is set to indicate that bits shifted one position to the right.
The unload bit is the instruction's output. The .UL bit stores the status of the bit that was
shifted out of the range of bits.
The error bit is set when .LEN < 0.
The length specifies the number of array bits to shift.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type Format
DINT Array tag
CONTROL Tag
BOOL Tag
DINT Immediate
Description
Array to modify
Specify the element where to begin the shift
Do not use CONTROL.POS in the subscript
Control structure for the operation
Bit to load
Number of bits in the array to shift