5-32
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
5.3.3 Diagnosing Faults with STEP 5 (Station Diagnostics)
With STEP 5 you can systematically localize and evaluate a fault:
Table 5-11 Diagnostics with STEP 5
Diagnostics
...
Diagnostics overview
Records all stations which have diagnostics
data pending.
Diagnostics for parameter
assign. and addressability
Records all stations which can be parameter-
ized and addressed.
Station status
Provides data on the status of the slave sta-
tions.
Station diagnostics
Provides general data on the status of the
slave stations.
Identifier–related diagnos-
tics (module diagnostics)
Localizes the defective module in the
ET 200U slave station.
The diagnostics for parameter assignment and addressability and the diagnos-
tics overview are described in the “ET 200 Distributed I/O System”
Manual, as they are applied to all slave stations.
To
avoid
misunderstandings, the
two
diagnostics
bytes of the
diagnostics word
are referred to in this chapter as the “diagnostics address” and “diagnostics
a 1”. The load and transfer operations in this chapter refer to the de-
fault diagnostics address 252.
If more than one diagnostics message is displayed, the last message remains
on the screen.
When using page addressing, the diagnostics word is located in the basic
page. Before you request diagnostics as described in this chapter, you must
first of all “switch over” to the basic page number.
The P area is addressed via pages. The basic page number of the IM 308–B
interface module is “O” (PO). You want to request and evaluate diagnostics
overview. You have accepted the default diagnostics address 252.
L KB 0
Page selection
0
T PY 255
age se ect o
L KY 127,n
Request diagnostics overview (n = 0, 1, 2 to 7)
,
T PW 252
q
g
(
, ,
)
l
h di
i
d
L PW 252
Evaluate the diagnostics word
L KH 0000
F
lt?
!=F
BEC
Fault?
BEC
JU FB
E
l
t th f
lt i FB
JU FBx
Evaluate the fault in FBx
General Remarks
on Diagnostics
Special Features
of Requesting
Diagnostics Using
Page Addressing
Example
ET 200U(DP Standard): Address Assignm.,Starting–Up, Diagnosing Faults Using COM ET 200
