VEGA VEGACAL 64 Profibus PA - Manual (Page 34)

34
8 Maintenance and fault rectification
VEGACAL 64 • Profibus PA
30031-EN-130917
8 Maintenance and fault rectification
8.1 Maintenance
If the instrument is used properly, no special maintenance is required
in normal operation.
8.2 Rectify faults
The operator of the system is responsible for taking suitable meas-
ures to rectify faults.
VEGACAL 64 offers maximum reliability. Nevertheless, faults can oc-
cur during operation. These may be caused by the following, e.g.:
•
Sensor
•
Process
•
Voltage supply
•
Signal processing
The first measures to be taken are to check the output signals as well
as to evaluate the error messages via the display and adjustment
module. The procedure is described below. Further comprehensive
diagnostics can be carried out on a PC with the software PACTware
and the suitable DTM. In many cases, the causes can be determined
and the faults rectified this way.
The first measures to be taken are to check the output signals as well
as to evaluate the error messages via the display and adjustment
module. The procedure is described below. Further comprehensive
diagnostics can be carried out on a PC with the software PACTware
and the suitable DTM. In many cases, the causes can be determined
and the faults rectified this way.
The following table describes possible errors and helps to remove
them:
Error Cause Rectification
When an addi-
tional instrument
is connected, the
segment fails.
Max. supply
current of the seg-
ment coupler
exceeded
Measure the current consumption, re-
duce size of segment
Wrong pres-
entation of the
measured value in
Simatic S5
Simatic S5 cannot
interpret the num-
ber format IEEE
of the measured
value
Insert converting component from Sie-
mens
In Simatic S7 the
measured value
is always present-
ed as 0
Only four bytes
are consistently
loaded in the PLC
Use function component SFC 14 to
load 5 bytes consistently
Reaction when malfunc-
tions occur
Failure reasons
Fault rectification
Fault rectification
Checking Profibus PA