Fault Correction During Isochronous Operation On Profibus Dp - Siemens Simatic ET 200S Operating Instructions Manual

7.2.3

Fault correction during isochronous operation on PROFIBUS DP

Station failure of the ET 200S
The obtainable constant bus
cycle times are too long.
No isochronous signal
detection/output
7.3 Option handling on PROFIBUS DP
7.3
7.3.1 Basic principles of option handling on PROFIBUS DP
Principle
Option handling enables you to set up the ET 200S for future expansions (options). Option
handling means that you install, wire, configure, and program the planned maximum
configuration of the ET 200S. The electronic modules required for this are merely replaced
with inexpensive RESERVE modules, which you can easily replace later with the planned
electronic modules.
This means that the ET 200S can be completely prewired ("master cabling") because the
RESERVE module is not connected to the terminals of the terminal module and therefore is
not connected to the process.
The RESERVE modules for future expansion at the right-hand end of the station are
optional. In this case, preparatory installation and wiring are possible but not a prerequisite.
See also
Removing and inserting modules during operation (Page 5-28)
ET 200S
Operating Instructions, 12/2005, A5E00515771-03
Event
Faulty isochronous operation
(10 or more clock failures or
clock violations).
The input delays of the HIGH
FEATURE digital input modules
are not optimally set.
Wrong sub-process image used.
Negative RET_VAL in the case
of SFCs 126/127
7.3 Option handling on PROFIBUS DP
Cause
Check the parameter
assignment.
Decrease the input delay of the
HIGH FEATURE digital input
modules.
Check whether the same sub-
process image was used in the
user program of OB 61 (or up to
OB 64) when SFCs 126/127 are
called and in the configuration of
the DP master/DP slave.
Functions
Action
7-7