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SVC_REQ 6 Example
When enabling contact
#FST_SCN is set, the
parameter blocks for the
checksum task function are
built. Later in the program,
when input %I00137
transitions on, the number of
words being check-summed
is read from the CPU
operating system. This
number is increased by 16,
with the results of the
ADD_UINT function being
hold new count
placed in the
for set
parameter. The
second service request block
requests the CPU to set the
new word count.
The example parameter blocks are located at address %L00150. They have the following contents:
GFK-2950C
%L00150 0 = read current count
%L00151 hold current count
%L00152 1 = set current count
%L00153 hold new count for set
February 2018
Chapter 6. Service Request Function
285
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