5.19 Diagnostic entries
Appendix A ‘System specific event IDs’ page 187
n
You may read the diagnostics buffer of the CPU via the Siemens SIMATIC Manager.
Besides of the standard entries in the diagnostics buffer, the VIPA CPUs support
some additional specific entries as Event-IDs.
n
To monitor the diagnostics entries you choose in the Siemens SIMATIC manager
‘PLC
è
Module information’
. Via the register "Diagnostics Buffer" you reach the diag-
nostics window.
n
The current content of the diagnostic buffer is stored at the memory card by means of
the CMD DIAGBUF.
Chap. 5.18 ‘CMD - auto commands’ page 88
n
The diagnostic is independent from the operating mode of the CPU. You may store a
max. of 100 diagnostic entries in the CPU.
5.20 Control and monitoring of variables with test functions
n
For troubleshooting purposes and to display the status of certain variables you can
access certain test functions via the menu item
Debug
of the Siemens SIMATIC Man-
ager.
n
The status of the operands and the RLO can be displayed by means of the test func-
tion
‘Debug
è
Monitor’
.
n
The status of the operands and the RLO can be displayed by means of the test func-
tion
‘PLC
è
Monitor/Modify Variables’
.
n
This test function displays the current status and the RLO of the different operands
while the program is being executed.
n
It is also possible to enter corrections to the program.
n
The processing of the states may be interrupted by means of jump commands or by
timer and process-related interrupts.
n
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.
n
The interruption of the processing of statuses does not change the execution of the
program. It only shows that the data displayed is no longer valid.
When using the test function "Monitor" the PLC must be in RUN mode!
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 / ACCU 1
n
ACCU 2
n
Condition byte
n
absolute memory address SAZ. In this case SAZ is followed by a "?".
Accessing diagnostic data
Overview
‘Debug
è
Monitor’
VIPA System 300S
+
Deployment CPU 314-6CF23
Control and monitoring of variables with test functions
HB140 | CPU | 314-6CF23 | en | 19-01
90