Plc Diagnosis Represented As A Ladder Diagram - Siemens sinumerik 802d sl Operation And Programming Manual

System
7.3

PLC diagnosis represented as a ladder diagram

7.3 PLC diagnosis represented as a ladder diagram
Functionality
A PLC user program consists to a large degree of logical operations to realize safety func-
tions and to support process sequences. These logical operations include the linking of vari-
ous contacts and relays. As a rule, the failure of a single contact or relay results in a failure
of the whole system/installation.
To locate causes of faults/failures or of a program error, various diagnostic functions are of-
fered in the "System" operating area.
Note
It is not possible here to edit the program.
Operating sequence
Select the <PLC> softkey which is to be found in the "System" operating area.
PLC
The project stored in the permanent memory is opened.
PLC
program
7.3.1 Screen layout
The screen layout with its division into the main areas corresponds to the layout already de-
scribed in Section 1.1. Any deviations and amendments pertaining to the PLC diagnosis are
shown below.
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SINUMERIK 802D sl Operation and Programming Nibbling (BP-N), 06/2006 Edition
6FC5 398-3CP10-0BA0