Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 165)

Chapter

131

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

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 165