Rockwell Automation Publication 1756-RM006K-EN-P - November 2018 283
Mode BOOL The mode input. Set to enable Relative mode. Clear to enable Absolute mode.
Default is set.
WordSize DINT The word size in bits. Specify the number of bits to use when computing (In
n
-In
n-1
) in
Relative mode.
WordSize is not used in Absolute mode.
When the change in In is greater than 1/2 * 2
(Wordsize-1)
, Out changes sign.
When WordSize is invalid,Out is held and the instruction sets the appropriate bit in
Status.
Valid = 2 to 32
Default = 14
Multiplier DINT The multiplier. Divide this value by 100,000 to control the ratio of In to Out. If invalid,
the instruction limits the value and sets the appropriate bit in Status.
Valid = -1,000,000 to 1,000,000
Default = 100,000
Output
Parameter
Data Type Description
EnableOut BOOL Enable output.
Out REAL The instruction’s Out. If the Out calculation overflows, Out is forced to
+
/- and the
appropriate bit in Status is set. Math status flags are set for this output.
Status DINT Status of the function block.
InstructFault
(Status.0)
BOOL The instruction detected one of the following execution errors. This is not a minor or
major controller error. Check the remaining status bits to determine what occurred.
WordSizeInv
(Status.1)
BOOL Invalid WordSize value.
OutOverflow
(Status.2)
BOOL The internal output calculation overflowed.
LostPrecision
(Status.3)
BOOL Out < -2
24
or Out > 2
24
. When the instruction converts Out from an integer to a real
value, data is lost if the result is greater than |2
24
| because the REAL data type is
limited to 2
24
.
MultiplierInv
(Status.4)
BOOL Invalid Multiplier value.
Description
The PMUL instruction operates in Relative or Absolute mode.
In Relative mode, the instruction’s output is the differentiation of the input from
scan to scan, multiplied by the (Multiplier/100,000). In Relative mode, the
instruction saves any remainder after the divide operation in a scan and adds it
To Next Page
Loading...
Need help?
General
