Device Functions Proline Promass 83 MODBUS RS485 7 Block OUTPUTS
Endress+Hauser 73
MEASURING
MODE
MODBUS register:
Data type:
Access:
4206
3211
Integer
read/write
! Note!
Function is not available unless the FREQUENCY setting was selected in the
OPERATION MODE function (4200).
Use this function to define the measuring mode for the frequency output.
Options:
0 = STANDARD
1 = SYMMETRY
2 = PULSATING FLOW
Factory setting: STANDARD
Description of the individual options:
STANDARD
The frequency output signal is proportional to the measured variable.
The flow components outside the scaled measuring range (defined by the VALUE
F LOW m and the VALUE F HIGH n) are not taken into account for signal
output.
• If one of the values is defined as equal to the zero flow (e.g. VALUE F LOW =
0m
3
/h), no message is given if this value is exceeded or not achieved and the
frequency output retains its value (0 Hz in the example). If the other value is
exceeded or not achieved, the message “FREQUENCY OUTPUT AT FULL
SCALE VALUE” appears and the frequency output responds in accordance with
the parameter setting in the function FAILSAFE MODE (4209).
• If both values defined are not equal to the zero flow (for example VALUE F
LOW = –5 m
3
/h; VALUE F HIGH = 10m
3
/h), the message “FREQUENCY
OUTPUT AT FULL SCALE VALUE” appears if the measuring range is exceeded
or not achieved and the frequency output responds in accordance with the
parameter settings in the function FAILSAFE MODE (4209).
A0001279
Fig. 27 : STANDARD measuring mode
SYMMETRY
• The frequency output signal is independent of the direction of flow (absolute
amount of the measured variable). The VALUE F LOW m and VALUE F HIGH
n must have the same sign (+ or -). The VALUE F HIGH o (e.g. backflow)
corresponds to the mirrored VALUE F HIGH n (e.g. flow).
A0001280
Fig. 28 : SYMMETRY measuring mode
! Note!
• The direction of flow can be output via the configurable relay or status outputs.
• SYMMETRY cannot be selected unless the values in the VALUE F LOW (4204)
and VALUE F HIGH (4205) functions have the same sign or one of the values is
zero. If the values have different signs, SYMMETRY cannot be selected and an
“ASSIGNMENT NOT POSSIBLE” message is displayed.
(continued on next page)
Function description
OUTPUTS → PULSE/FREQUENCY OUTPUT 1 → CONFIGURATION (FREQUENCY)
Q
125
100
0
Freq.
➀➁
Q
125
100
Freq.
0
➀➁➂
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