Spc3 profibus interface center – Siemens SPC3 User Manual

Page 65

SPC3

PROFIBUS Interface Center

SPC3 Hardware Description

V1.3

Page 63

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

Active

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!“).