Siemens SIMATIC S5 ET 200U - Request Station Diagnostics

5-37
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
The station diagnostics provides general information on the ET 200U slave
station.
L KY n,3
T PW 252
The number of the slave station (n 0 station number) from
which station diagnostics is requested must be stored in
the “diagnostics address” byte; the code for “station diag-
nostics”
(= 3) is to be stored in the “diagnostics address + 1”
byte.
The IM 308–B interface module then writes the diagnostics message in the
I/O word “diagnostics address”.
L KH 0201
L PW 252
!=F
BEC
JU FBx
Load diagnostics word
No fault?
Evaluate fault in the FBx.
Diagnostics Word “Header” and “Station diagnostics”, code = 3
76543210 76543210
Diagnostics address
“Header”
Diagnost. address + 1
“Station diagnost.”
e
für
i
ons–
nose
Length of station
diagnostics incl.
“Header” (Length =
2 bytes)
00000010
1: An output has been activated incorrectly (short circuit of
L+; only for a module with diagnostics)
1: Load voltage missing or output short circuit of M (only
for a module with diagnostics).
1: Module withdrawn or bus unit defective.
0: Bit is always “0”.
1: Wrong number of identifiers configured.
1: Slave station in slow mode.
Code for
station
diagnost.
0: Bit is always “0”.
0: Bit is always “0”.
Figure 5-15 Structure of the Diagnostics Word after Request of Station Diagnostics
Request Station
Diagnostics
Read Station Diag-
nostics
ET 200U(DP Standard): AddressAssignm.,Starting–Up, DiagnosingFaultsUsing COM ET 200