User−Specific Diagnostics With Siemens Step - Festo CPX Series Manual

3. Diagnosis
3.5.3 User−specific diagnostics with Siemens STEP 7
Control Module
system
STEP 7 OB 82
Siemens
OB 86
SFB 54
RALRM
Tab. 3/10: Intended use (meaning) of the Organisation Modules OM 82 and OM 86 and
the Function Module SFB 54
3−18
The diagnostics for PROFINET are supported in STEP 7 by
Organisation Modules (OMs) and Function Modules (FMs).
OMs and FMs consist of individual function instructions and
thus form special program modules, so−called Instruction
Lists (AWL) which can be integrated in user−specific
programs.
Organisation Modules start in response to an error or a
device−related diagnosis and are used thereby for localisation
of the source of the error while Function Modules read the
diagnostics of the CPX bus node and write to a data area of
the user program (see example in Fig. 3/3).
In this way, the system−specific diagnostics are individually
integrated in comprehensive, higher−order diagnostics
systems.
The following OMs and FMs can typically be used for
diagnostics purposes: OM 82, OM 86 and SFM 54
(see Tab. 3/10).
Meaning
Starts as reaction to a device−related
diagnosis
Starts as reaction to failure of an IO device
or the network
Starts as reaction to failure of an IO device
or the network
Detail information
Siemens
Reference manual
System and standard System and standard
functions for S7−300/400"
PROFIBUS/PROFINET /
Guidelines with respect to G id li i h
Function Blocks
Festo P.BE−CPX−PN IO−EN en 1008b