Installation manual

Publication 1747-RM001G-EN-P - November 2008
7-20 Application Specific Instructions
Enter Parameters
To program these instructions, you need to provide the processor with the
following information.
• Source - The indexed address of your input file.
• Reference - The indexed address of the file that contains the data with
which you compare your input file.
• Result - The indexed address of the file where the instruction stores the
position (bit) number of each detected mismatch.
• Control - The control is the address of TWO continuous control
structures (i.e. R6:0 and R6:1). The first control structure is a
comparison control, which stores status bits, the length of the source
and reference files (in bits), and the next bit position during operation.
The second control structure is a result control, which stores the bit
position number each time the instruction finds a mismatch between
source and reference files.
Use the result control address with mnemonic when you address these
parameters.
• Length (.LEN) is the decimal number of elements in the result file.
Make the length long enough to record the maximum number of
expected mismatches.
• Position (.POS) is the current position in the result file. Enter a value
only if you want the instruction to start at an offset concurrent with a
control file offset for one scan.
ATTENTION
Do not use the same address for more than one
control structure. Duplication of these addresses
could result in unpredictable operation, possibly
causing equipment damage and/or injury to
personnel.