Diagnostics Using The User Program - Siemens Simatic 6ES7 157-0AD81-0 A0 Series Manual

Diagnostics Using the User Program

Overview of contents
This chapter describes the structure of the IM 157 diagnosis. An example is used
to illustrate the evaluation of a diagnostic frame.
Section
10.1 Structure of the slave diagnosis
10.2 Structure of the diagnostic blocks
10.3 Reading out the diagnosis from the underlying slaves
10.4 Example of a diagnosis in redundant operation
Some of the following details apply to both the DP/PA link with its PA field devices
and to the Y link with its underlying DP slaves. In these instances, the following
terminology will be used in the interest of clarity:
S "Link" stands for both the DP/PA link and the Y link.
S "Slaves" stands for both the PA field devices and the underlying DP slaves.
S "Underlying master system" stands for both the PA master system and the
underlying DP master system.
Slave diagnosis
Slave diagnosis is performed in accordance with IEC 61784-1:2002 Ed1 CP 3/1.
Depending on the DP master, it can be read out with STEP 7, SIMATIC PDM or
other configuration tools.
In STEP 7, the diagnostic frames of the underlying DP slaves can be displayed in
the online view of the HW Config. See "Diagnosing hardware" in the STEP 7 online
help.
Additional methods of reading out diagnostic information are described in the
SIMATIC Software; Programming with STEP 7 V5.x manual.
DP/PA Link and Y Link Bus Couplings
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Topic
10
Page
10-2
10-4
10-17
10-18
10-1