Endress+Hauser Proline Prosonic Flow 93C Description Of Device Functions page 40

6 Block OUTPUTS
40
OUTPUTS → CURRENT OUTPUT 1 → CONFIGURATION
VALUE 0_4 mA Parameter setting example A:
(Continued) 1. VALUE 0_4 mA (4002) = not equal to zero flow (e.g. –5 m
2. VALUE 0_4 mA (4002) = not equal to zero flow (e.g. 100 m
and
MEASURING MODE (4004) = STANDARD
When you enter the values for 0/4 mA and 20 mA, the working range of the measuring
device is defined. If the effective flow drops below or exceeds this working range (see
Fig.), a fault/notice message is generated (#351-354, current range) and the current
output responds in accordance with the parameter settings in the FAILSAFE MODE
function (4006)).
Parameter setting example B:
1. VALUE 0_4 mA (4002) = equal to zero flow (e.g. 0 m
2. VALUE 0_4 mA (4002) = not equal to zero flow (e.g. 100 m
and
MEASURING MODE (4004) = STANDARD
When you enter the values for 0/4 mA and 20 mA, the working range of the measuring
device is defined. In doing so, one of the two values is parameterized as zero flow
(e.g. 0 m
If the effective flow drops below or exceeds the value parameterized as the zero flow, no
fault/notice message is generated and the current output retains its value.
If the effective flow drops below or exceeds the other value, a fault/notice message is
generated (#351-354, current range) and the current output responds in accordance with
the parameter settings in the FAILSAFE MODE function (4006).
Deliberately only one flow direction is output with this setting and flow values in the
other flow direction are suppressed.
Parameter setting example C:
MEASURING MODE (4004) = SYMMETRY
The current output signal is independent of the direction of flow (absolute amount of the
measured variable). The 0_4 mA VALUE
same sign (+ or -). The "20 mA VALUE"
20 mA VALUE
ASSIGN RELAY (4700) = FLOW DIRECTION
With this setting e.g. the flow direction output via a switching contact can be made.
Parameter setting example D:
MEASURING MODE (4004) = PULSATING FLOW → Page 42
Device functions Proline Prosonic Flow 93C PROFIBUS DP/PA
Functional description
(only with PROFIBUS DP)
VALUE 20 mA (4003) = not equal to zero flow (e.g. 10 m
VALUE 20 mA (4003) = not equal to zero flow (e.g. –40 m
1)
mA
20
4
Q
-5 0 10
➀ ➀
VALUE 20 mA (4003) = not equal to zero flow (e.g. 10 m
VALUE 20 mA (4003) = equal to zero flow (e.g. 0 m
3
/h).
1)
mA
20
4
Q
0 10
➀
n
(e.g. flow).
mA
o
3
/h)
3
/h) or
3
/h)
3
/h)
2)
mA
20
4
Q
-40 0 100
➀ ➀
3
/h)
3
/h) or
3
/h)
3
/h)
2)
mA
4
20
Q
0 100
➀
m n
and the 20 mA VALUE must have the
o
(e.g. backflow) corresponds to the mirrored
20
4
0
Q
m n
Endress+Hauser
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