Foxboro PLC controller card AD908MF module

Foxboro PLC controller card AD908MF module

Technical data of product parameters

When the status of all non-masked bits in the source word match those of the
corresponding reference word, the instruction sets the found bit (FD) in the
control word. Otherwise, the found bit (FD) is cleared.
The bits mask data when reset and pass data when set. The instruction will not AD908MF
change the value in the destination word unless you set the mask bits. The
mask can be fixed or variable. If you enter a hexadecimal code, it is fixed. If
you enter an element address or a file address for changing the mask with each AD908MF
step, it is variable.
When the rung goes from false-to-true, the instruction increments to the next
step (word) in the sequencer file. Data stored there is transferred through a
mask and compared against the source data for equality. If the source data
equals the reference data, the FD bit is set in the SQC’s control counter.
Current data is compared against the source every scan that the rung evaluates
as true• Source can be a word address, file address, or a constant (-32768 to
32767).
If the source is a file address, the file length equals the length of the
sequencer load file. The two files will step automatically, per the position
value. AD908MF
• Length is the number of steps of the sequencer load file (and also of
the source if the source is a file address), starting at position 1. The
maximum number you can enter is 255 words. Position 0 is the startup
position. The instruction resets (wraps) to position 1 at each cycle
completion.
The position address assigned for a sequencer file is step zero.
Sequencer instructions use length plus one word of data for each file
referenced in the instruction. This applies to the source if addressed as a
file. AD908MF
A length value that points past the end of the programmed file causes a
runtime major error to occur.
When rung conditions change from false-to-true, the SQL enable bit (EN) is
set. The control element R6:4 increments to the next position in the sequencer
file, and loads the contents of source I:1.0 into this location. The SQL
instruction continues to load the current data into this location each scan that
the rung remains true. When the rung goes false, the enable bit (EN) is reset.

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