Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual - Manual (Page 258)

Bit Shifts
Chapter 14
14Ć6
WARNING: The counter address specified for the Bit Shift
Right instruction should be reserved for that instruction. Do not
manipulate the counter preset or accumulated values.
Inadvertent change to these values could result in hazardous or
unpredictable machine operation or a run-time error. Damage to
equipment and/or personal injury could result.
To program a Bit Shift instruction press [SHIFT REG] 13. The format that
appears and the technique for insertion of numbers, will be identical to that
for bit shift left (Figures 14.2 and 14.3) except that the title will read Bit
Shift Right.
The procedure for using the data monitor mode for data entry or monitor is
presented in Chapter 12.
This condition instruction that examines a user specified bit in a bit shift
register, such as shown in Figure 14.1, for an off or 0 condition. The
instruction can be used alone or in conjunction with other condition
instructions to affect the rung decision.
Instruction Overview:
Input instruction
Key sequence: [SHIFT] 18
Requires 3 words of users program
To program an Examine Off Shift bit press [SHIFT REG] 18. A display
represented by Figure 14.4 will appear.
14.2.1
Programming Bit Shift Right
Instruction
14.3
Examine Off Shift Bit
14.3.1
Programming Examine Off
Shift Bit Instruction