Diagram Illustrating How Station Diagnostics Is Requested With Fb Im308C - Siemens SIMATIC ET 200C Manual

Request Station
In order to request station diagnostics for an ET 200C station, you must call
Diagnostics the FB IM308C function block (FB 192) with the function FCT = SD.
The FB IM308C places the station diagnostics in the S5 data block of the
CPU opened with the FM IM308C call (data block or marker area). It is im-
portant to define two memory areas of equal size, in order to ensure that lim-
it-value alarms and diagnostics alarms do not overwrite each other
(see Figure 8-1).
Figure 8-1
Description
FB IM308C and its use relate to general access to diagnostics data of the
IM 308-C and are described in detail in the manual ET 200 Distributed
I/O System (Order No. 6ES5 998-3ES12).
The example below illustrates how to call station diagnostics with the aid of
the FB IM308C and store the information in a data block.
The example is followed by a description of how station diagnostics is
evaluated. This description is based on the assumption that the diagnostics
data is stored in a data block.
ET 200C Distributed I/O Station
EWA 4NEB 812 6119-02b
FB IM308C
1
Maximum Length: 20 Bytes
1
Slave Diagnostics = Station Diagnostics
Diagram Illustrating How Station Diagnostics is Requested with
FB IM308C
Fault Diagnostics with the IM 308-C
Length: 4 Bytes
Maximum Length:
16 Bytes – 4/8AI
12 Bytes – 4AI, 4AO
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