Siemens SIMATIC S5 User Manual

S5-115F Manual Error Diagnostics
5 Error Diagnostics
The S5-115F operating system detects errors which can occur in connection with any of the
following:
• Hardware
• Programming (STEP 5)
• Configuring (e.g. PLC parameters)
• Data handling (e.g. wrong address setting on interface modules).
The S5-115F offers the following methods of displaying error messages:
• ISTACK (Interrupt stack)
• BSTACK (Block stack)
• COM 115F - plaintext
5.1 Interrupt Analysis
When malfunctions occur, the operating system sets various ”analysis bits” that can be scanned
with the programmer using the ”ISTACK” function. LEDs on the CPU also report some mal-
functions.
5.1.1 ”ISTACK” Analysis
The interrupt stack (ISTACK) is an internal memory area of the CPU where malfunction reports are
stored. When a malfunction occurs, the appropriate bit is set.
Use a programmer to read this memory byte by byte.
Note
You cannot read the ISTACK when the PLC is in the ”RUN” mode.
EWA 4NEB 811 6149-02 5-1

Siemens SIMATIC S5 Specifications

General

Product type designation	SIMATIC S5
Programming language	STEP 5
Digital inputs	Varies by model
Digital outputs	Varies by model
Analog inputs	Varies by model
Analog outputs	Varies by model
Supply voltage	24V DC
CPU Type	Varies by model
Memory	Varies by model
Digital I/O	Varies by model
Analog I/O	Varies by model
Communication	PROFIBUS
Operating Temperature	0°C to 60°C
Relative Humidity	5% to 95% (non-condensing)