Endress+Hauser prolevel FMC 661 - Page 35

Value for 4 mA and
20 mA
The 4mA (V0H5) and 20 mA (V0H6) values,
default values 0% and 100%, determine
the levels at which the analogue signal
range begins and ends.
Example:
4 mA = 20%,
20 mA = 80%
# Matrix Entry Remarks
1 V0H5 20 4mA value, 20 %
2 - »E« Register entry
3 V0H6 80 20 mA value, 80%
4 - »E« Register entry
Note!
• Set in calibration/linearisation units
• When V0H3 = 0, V0H5 = 0 mA value
Output on alarmThe analogue output can be set such that
it takes on distinctive values when a fault
with alarm is detected. Depending on the
setting in V1H3/V1H8, the relays may also
follow the analogue output. The entry is
made in V0H7:
• 0 = -10% of signal range
• 1 = +110% of signal range (default)
• 2 = last value is held
Example:
Output -10 % on alarm
# Matrix Entry Remarks
1 V0H7 0 -10% on alarm
2 - »E« Register entry
The current values set on an alarm are
shown in the table
V0H3 =
Current on alarm when V0H7 =
0: (-10%) 1: (+110%) 2: hold
0: 0
…
20 mA
≤
-2 mA
≥
22.0 mA last value
1: 4
…
20 mA
≤
-2 mA
≥
22.0 mA last value
Caution!
• If setting 2 is chosen, the fault recognition system on the 0/4…20 mA signal line is
effectively deactivated. Although the transmitter recognises a fault, i.e. the alarm
relay de-energises and the associated LED lights, the signal output to any follow-up
instrumentation appears to indicate a correct measured value.
0%
100%
V0H5
V0H6
level
0/4 mA 20 mA
BA142_38
Fig. 4.12:
Value for 4 mA and 20 mA, V0H5 and V0H6
t
-2
4
0
22
20
V0H7
1 = +110%
2 = hold value
mA
BA142_39
0 = -10%
alarm
Fig. 4.13:
Output on alarm, V0H7
Note!
Caution!
Prolevel FMC 661 Chapter 4: Level Measurement
Endress+Hauser 31