Diagnosis Of Faults Of F-Sms - Siemens S7-300 Installation And Operating Manual

Fault reaction and diagnostics

6.2 Diagnosis of Faults of F-SMs

6.2 Diagnosis of Faults of F-SMs
Definition
The diagnostics functions can be used to identify signal detection errors at the fail-safe
signal modules. Diagnostics information is assigned either to a channel or to the entire
module.
Diagnostics functions are not safety-sensitive
Diagnostics functions (displays and messages) are not implemented with safety-oriented
characteristics, as these are not safety-relevant. That is, the diagnostics functions are not
tested internally.
Diagnostics features for fail-safe signal modules
Diagnostics functions for fail-safe signal modules:
● LED display on the front panel
● Diagnostic messages of the fail-safe signal modules
Programmable and non-programmable diagnostic messages
A distinction is made between assignable and nonassignable diagnostic messages in terms
of diagnostics data evaluation.
Diagnostics functions should be enabled or disabled to suit application requirements.
Diagnostics using the LED display
Diagnostic messages are always indicated at the SF LED (group error LED). The SF LED is
activated when the F-SM generates a diagnostic message. It is deactivated again after all
faults/errors have been cleared.
Restraints of the F-SMs listed below:
● SM 326; DI 8 x NAMUR
● SM 326; DO 10 x DC 24V/2A
● SM 336; AI 6 x 13Bit
Assignable diagnostic messages (for example, wire break or short circuit) only activate the
SF LED if diagnostics is enabled at the "Group diagnostics" parameter in the object
properties dialog of the F-SM in
module
56
WARNING
).
HW Config
(see chapters for
Installation and Operating Manual, 01/2010, A5E00085586-10
Digital modules Analog
and
Fail-safe signal modules