Standard Function Block Fb 230 - Siemens SIMATIC S5 Manual

S5-95U – addressing, accessing the distributed I/O and diagnostics with STEP 5

10.3.3 Standard function block FB 230

Function of the
FB 230
Calling the FB 230
Creating the DB
Block parameters
Table 10-5 Meanings of the block parameters of the FB 230
Name Mode Type
S_NR D KY
10-8
You must call the FB 230 in the STEP 5 application program in order to
request slave diagnostics.
In the simplest case, the FB 230 is called in cyclic program processing.
If you call the FB 230 in the process alarm or the time alarm processing, you
must implement measures in the STEP 5 application program to ensure that
the FB 230 does not interrupt itself. You do this by disabling the alarms
before each FB 230 call and enabling the alarms again once the FB 230 has
been called.
Before you call the FB 230 in the STEP 5 application program, you must
create the data block for the diagnostics data: note that this data block must
be at least 17 data words in length.
See Sections 10.3.2 and 9.4 for details of the structure of slave diagnostics.
The table below shows the meanings of the block parameters which you must
send to the FB 230 in the STEP 5 application program. You can call the
FB 230 with direct or indirect parameterization.
Designation
Station number of KY = x, y
the DP slave from
x = 0:
which you request
y = 0 to 255:
diagnostics data diagnostics data
or
x<>0:
y:
Valid assignment
Direct parameterization
Station number
Indirect parameterization
Irrelevant if parameterization is indirect
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a