Rockwell-automation 1772-AF3,D17726.5.2 User Manual AUX FUNCT PROM User Manual download pdf (Page 23)

File Diagnostic Instruction

Chapter 4

46

Figure 4.7

Result

File

Word

Location

0520

Bit Location

17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

001EN LS DN TR

0521

0522

1 1 1 1

work area

Description

Error count in

bits 13-00, 001

Address or Mismatch,

upper 3 digitd, 005

Control bits, 17-14

Status of mismatch bit 0525/02 in file of actual values

Address of Mismatch,

lower 2 digits, 25

2-digit bit number

of mismatched bit, 02

Each time the instruction finds a mismatch (at address 0515/02 in this example),

it writes the binary bit pattern of new data over old data in the result file. After

the instruction sets the done bit, it clears all data in the result file after the next

false-to-true transition of the enable bit.

NOTE: The result file must be initialized to zero before you enable the file

diagnostic instruction for the first time. If you want to change file data for a

new search, you should do so after the done bit is set.

WARNING: Do not manipulate data in the following addresses

or bits:

Data address or result address of the instruction

Control bits 16-14 in the first result word

Instruction work area, bits 16-14 in the second result word

Manipulating this data could cause the instruction to miss a mismatch or to

detect a mismatch when one did not exist. If this instruction directly or

indirectly controls an output, an inadvertent change to these values could result

in unpredictable operation and cause possible damage to equipment and/or

injury to personnel. It could also cause a run-time error.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 31 32

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