II - DCE FEL ČVUT v Praze

3.6.4 Diagnostics of Analog Modules
Introduction
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
A comparison of the analog modules with regard to their diagnostic messages
is described in this section.
What is diagnostics With the aid of the diagnostics function, you can determine whether analog
processing is faulty or free of faults and what faults have occurred. On
detecting a fault, the analog modules output the signal value ”7FFFH”
irrespective of the parameterization.
Parameterizing
diagnostics
Diagnostics is parameterized with STEP 7.
SIMATIC S7 Ex Analog Modules
Diagnostic evaluation A differentiation is made with regard to diagnostic evaluation between
configurable and non-configurable diagnostic messages. In the case of the
configurable diagnostic messages, evaluation only takes place when
diagnostics has been enabled by means of parameterization (”diagnostic
enable” parameter). The non-paramaterizable diagnostic messages are always
evaluated irrespective of the diagnostic enable.
Diagnostic messages trigger following actions:
SF LED on analog module lights,
if applicable channel fault LED,
transfer of diagnostic message to CPU,
diagnostic interrupt triggered (only if diagnostic interrupt has been
enabled in the parameterization).
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