Prosonic S FMU95
Troubleshooting
E Hauser
77
7.1.5
Influence of the errors on the status byte of the output signal
The following table specifies the status, which the block output values assume if an error is present.
There are three possible status values: GOOD, UNCERTAIN and BAD.
The status is transmitted to the next block. If different status values occur in one chain, the weaker
status is overwritten by the stronger one according to the following priority:
• BAD overwrites UNCERTAIN and GOOD.
• UNCERTAIN overwrites GOOD.
• GOOD overwrites no other status.
Therefore, the strongest status of the chain remains at the output of the AI Block. This status is
transferred to the PLC together with the measured value.
Examples
!
Note!
Errors may occur at different places within the instrument. Each error is allocated to one of the
following areas:
• sensor error => sensor block (US 1 - US 10)
• level error => level block (LE 1 - LE 10)
• calculation error => sum block/averaging block (SL 1 - SL 10; AL 1 - AL 10)
• output error => AI Block (AI 1 - AI 20)
Each sensor block (US1 to US10) has two outputs. The first transmits for the measured distance D,
the second transmits the sensor temperature T.
L00-FMU95xxx-19-00-00-yy-006
A: UNCERTAIN from the sensor block (US1) overwrites GOOD from the level block (LE1);
B: BAD from the level block (LE1) overwrites UNCERTAIN from the sensor block (US1);
C: BAD from the second level block (LE2) overwrites GOOD from the first level block (LE1). Therefore, the status at the
output of the averaging block AL1 is BAD.
US1
LE1
AI1
W 01 661
GOOD
UNCERTAIN
UNCERTAIN
UNCERTAIN
FDU9x
LE1
AI1
W 01 661
W 01 601
BAD
UNCERTAIN
BAD
BAD
LE1
GOOD
GOOD
GOOD
GOOD
LE2
W 01 601
BAD
GOOD
BAD
AL1
BAD
AI1
BAD
A
B
C
FDU9x
FDU9x
US1
LE1
AI1
D
T
AI1
UNCERTAIN
AI2
GOOD
US1
US1
D
T
US1
US1
D
T
FDU9x
FDU9x
GOOD
US1
US1
D
T
PRO
FI
BU
SD
P
