Troubleshooting; Diagnosis; Led Status - Danfoss FC 300 Profibus Manual

FC 300 Profibus

Troubleshooting

Diagnosis

PROFIBUS-DP provides a flexible means of performing diagnosis of slave units, based on diagnosis messages.
During normal cyclical data exchange, the slave can set a diagnosis bit, which requests the master to send a
diagnosis message during the next scan cycle, instead of the normal data exchange.
The slave then answers the master with a diagnosis message consisting of standard diagnosis information,
6 bytes, and possibly extended, vendor specific, diagnosis information. The standard diagnosis messages
covers a rather limited range of general diagnosis possibilities, whereas the extended diagnosis function
offers very detailed messaging specific to the FC 300.
The extended diagnosis messages for the FC 300 can be found in the section Warning word, extended
status word and alarm word.
A master or a network analysing tool will be able to translate these diagnosis words into real text messages
using the GSD-file.
Troubleshooting

LED Status

First, check the LEDs. The two bi-colour LEDs on
the PROFIBUS card indicate the status of PROFIBUS
communication. The lower LED indicates the Net
status, i.e. the cyclical communication to the
PROFIBUS master. The upper LED indicates the
Module status, i.e. acyclical DP V1 communication
from either a PROFIBUS Master Class 1 (PLC) or a
Master Class 2 (MCT10, FDT tool).
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MG.33.C2.02 - VLT is a registered Danfoss trademark