The processing of the states may be interrupted by means of jump
commands or by timer and process-related interrupts. The interrup-
tion of the processing of statuses does not change the execution of
the program. It only shows that the data displayed is no longer valid.
At the breakpoint the CPU stops collecting data for the status display
and instead of the required data it only provides the PG with data
containing the value 0. For this reason, jumps or time and process
alarms can result in the value displayed during program execution
remaining at 0 for the items below:
n the result of the logical operation RLO
n Status / AKKU 1
n AKKU 2
n Condition byte
n absolute memory address SAZ. In this case SAZ is followed by a
"?".
This test function returns the condition of a selected operand (inputs,
outputs, flags, data word, counters or timers) at the end of program
execution. This information is obtained from the process image of the
selected operands. During the "processing check" or in operating
mode ST
OP the periphery is read directly from the inputs. Otherwise
only the process image of the selected operands is displayed.
n Control of outputs
–
It is possible to check the wiring and proper operation of output
modules.
– You can set outputs to any desired status with or without a
control program. The process image is not modified but out-
puts are no longer inhibited.
n Control of variables
– The following variables may be modified: I, Q, M, T, C and D.
– The process image of binary and digital operands is modified
independently of the operating mode of the CPU.
– When the operating mode is RUN the program is executed
with the modified process variable. When the program con-
tinues they may, however, be modified again without notifica-
tion.
– Process variables are controlled asynchronously to the execu-
tion sequence of the program.
‘PLC
è Monitor/Modify
V
ariables’
VIPA System 300SDeployment CPU 314-6CF03
Control and monitoring of variables with test functions
HB140 | CPU | 314-6CF03 | GB | 16-43 128
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