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Siemens SIMATIC S5 User Manual

Siemens SIMATIC S5
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S5-115F Manual Error Diagnostics
5.1.3 LED Error Signalling
Certain errors are indicated by LEDs on the CPU. Table 5-3 explains these error signals.
Table 5-3. Meaning of the Error LEDs on the CPUs
MeaningLED
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QVZ
lights up
ZYK
lights up
BASP
Time out
(The CPU has entered the ”STOP” mode.)
Scan time exceeded
(The CPU has entered the ”STOP” mode.)
Digital outputs are disabled.
(The CPU is in the ”RESTART” or the ”STOP” mode.)
5.2 Program Errors
5.2.1 Determining an Error Address
The STEP address counter (SAZ) in the ISTACK (bytes 25 and 26) indicates the absolute memory
address of the STEP 5 statement in the PLC before which the CPU has entered the ”STOP” mode.
You can use the ”DIR PLC” programmer function to determine the appropriate block starting
address.
Example:
Figure 5-3 shows a program consisting of OB 1, PB 0, and PB 7. PB 7 contains an illegal statement.
BE
JU PB 0
BE
OB 1
JU PB 7
BE
PB 0
PB 7
Illegal
statement
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Figure 5-3. Structured Program with Illegal Statement
EWA 4NEB 811 6149-02
5-5

Table of Contents

Other manuals for Siemens SIMATIC S5

Preview: Equipment Manual
Equipment Manual197 pages
Preview: Operating Instructions
Operating Instructions43 pages
Preview: Instructions
Instructions40 pages

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Siemens SIMATIC S5 Specifications

General IconGeneral
Product type designationSIMATIC S5
Programming languageSTEP 5
Digital inputsVaries by model
Digital outputsVaries by model
Analog inputsVaries by model
Analog outputsVaries by model
Supply voltage24V DC
CPU TypeVaries by model
MemoryVaries by model
Digital I/OVaries by model
Analog I/OVaries by model
CommunicationPROFIBUS
Operating Temperature0°C to 60°C
Relative Humidity5% to 95% (non-condensing)

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