Rockwell Automation 1772-LV Mini-PLC - 2/15 Programmable Controller (Series B) Programming and Operations - Manual (Page 165)

Chapter
13
13Ć1
Troubleshooting Aids
Troubleshooting aids are useful during start-up of your operations and when
troubleshooting your Mini-PLC-2/15 programmable controller system. They
are:
Bit manipulation function
Bit monitor function
force on and force off functions
Temporary end instruction
ERR message display
We will discuss each troubleshooting aid.
Bit manipulation allows the status of the displayed bits to be selectively
changed or forced. It is useful in setting initial conditions in the data of word
instructions.
Bit manipulation can function when the processor is in program mode. When in
test, or run/program, the user program may override the bit status in the next
scan.
The [
→
] and [
←
] keys can be used to cursor over to any bit. With the cursor on
the desired bit, you can change its status by pressing the [1] or [0] key. Bit
manipulation also allows the forcing of image table bits.
To terminate this function, press [CANCEL COMMAND].
WARNING: If it is necessary to change the status of any data
table bit, be sure that the consequences of the change are
thoroughly understood. If not, unpredictable machine operation
could occur directly or indirectly as a result of changing the bit
status. Damage to equipment and/or injury to personnel could
result.
Objectives
Bit Manipulation Function