Diagnostics
5.2 Fault Diagnostics
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
43
Reaction of the F-module with inputs to communication errors
The F-module with inputs responds differently to communication errors compared to other
errors.
If a communication error is detected, the current process values remain set at the inputs of
the F module and the channels are not passivated. The current process values are sent to
the F-CPU and are passivated in the F-CPU.
See also
Properties of the PM-E F pm DC24V PROFIsafe Power Module (Page 62)
Properties of the PM-E F pp DC24V PROFIsafe Power Module (Page 83)
Properties of the PM-D F DC24V PROFIsafe Power Module (Page 96)
Properties of the 4/8 F-DI 24 VDC PROFIsafe Digital Electronic Module (Page 105)
Properties of the 4 F-DI/3 F-DO DC24V PROFIsafe Digital Electronic Module (Page 136)
Properties of the 4 F-DO DC24V/2A PROFIsafe digital electronic module (Page 163)
Properties of the EM 1 F-RO DC24V/AC24..230V/5A (Page 177)
5.2 Fault Diagnostics
Purpose of Diagnostics
Diagnostics are used to determine whether error-free signal acquisition is taking place at the
fail-safe modules. Diagnostics information is assigned either to a single channel or to the
entire F-module.
Diagnostics functions are not safety critical
None of the diagnostic functions (displays and messages) are safety critical and therefore
not designed to be safety-related functions. Consequently, they are not tested internally.
Diagnostic Options for Fail-Safe Modules in ET 200S
The following diagnostic options are available for fail-safe modules:
● LED display on the module front panel
● Diagnostic functions of F-modules (slave diagnostics in accordance with IEC 61784-
1:2003.)
Non-Programmable Diagnostic Functions
Fail-safe electronic and power modules provide diagnostic functions which cannot be
programmed by the user. This means that the diagnostic functions are always activated, and
are automatically made available by the F-module in
STEP 7
and passed on to the F-CPU in
the event of a fault.
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