Diagnosis - Siemens SIMATIC S7 Manual

7

Diagnosis

Diagnostic
Function
Display Elements
(LED)
STATUS Outputs
of the
FB MODBUSPN
MODBUS / TCP communication via the integrated PN interface of the CPU
2XV9450-1MB02; Manual edition 2.1
The diagnostic functions of the PN PLC enable a fast localization of errors.
The following diagnostic features are available:
• Diagnosis via the display elements of the PLC
• Diagnosis via the STATUS_MODBUS and STATUS_CONN output of the
MODBUSPN function block.
The display elements inform you about the operating mode or about the error
conditions of the PLC. The display elements provide an overview of internal
errors, external errors and interface-specific errors.
For an error diagnosis, the MODBUSPN function block has 3 STATUS
outputs.
When reading the STATUS_MODBUS output, you are provided with a
general indication of errors that occurred during the Modbus-specific telegram
processing.
The STATUS_CONN output displays status information and error codes with
regard to the processing of the T functions.
The output STATUS_FUNC shows the name of the function, which caused
the error at STATUS_MODBUS or STATUS_CONN.
When reading the STATUS outputs, you are provided with a general
indication of errors that occurred during the telegram processing and
connection handling. The STATUS parameters can be evaluated in the user
program.
Diagnosis
7-1