Siemens SPC3 - Manual (Page 65)

SPC3 PROFIBUS Interface Center
SPC3 Hardware Description V1.3 Page 63
Copyright (C) Siemens AG 2003 All rights reserved. 2003/04
11.2.3 EXT_DIAG_OVERFLOW
This bit is set if more diagnostics data is present than will fit in the available diagnostics data area. For
example, more channel diagnostics could be present than the send buffer or the receive buffer makes
possible.
11.3 Diagnostics Processing from the System View
Inasmuch as it is bus-specific, the diagnostics information of the slaves is managed solely by the master
interface (for example, IM308B).
All diagnostics from the application are made available to the S6 program via corresponding data bytes. If
the External Diagnostics bit is set, the slaves to be diagnosed can already be evaluated in the diagnostics
overview. Then, a special error routine can be called up, whereby the standard diagnostics information and
the user-specific information can be evaluated.
After eliminating the current diagnostics situation, this can be signalled as a status message from the slave
without setting the external diagnostics bit.
With the COM ET200, a comfortable diagnostics tool is available on-line. At the present time, identification-
related diagnostics information can be displayed with it in plain text. In later phases, channel-related
diagnostics will also be supported. User-specific diagnostics are only displayed if the EXT_DIAG bit is set.
The figure below shows a screen during data processing, for example:
Set Program File C:PNO4..ET.200 SIMATIC S5 / COM ET 200
SINGLE DIAGNOSTICS
Station Number: 30 Station Type: ET 200U-
COMBI
Station Designation: Station4
Station Status: Slave not ready for data
exchange
External diagnostics
Configuration error
Device-Related Diagnostics
KH = 01
Identification-Related
Diagnostics
Slot
3
Active
F1 F2 F3 F4 F5 F6 F7 F8
EXIT
In the type file for the COM ET200 and in the GSD [device master data] file, fields are already provided for
referencing device-specific bits and pertinent plain text messages (for example, Bit 7: „I have had it; good
night!“).