7 Block OUTPUTS Device Functions Proline Promass 83 MODBUS RS485
96 Endress+Hauser
MEASURING
MODE
MODBUS register:
Relay output 1
Relay output 2
Data type:
Access:
4705
3810
4010
Integer
read/write
! Note!
This function is not visible unless a limit value was assigned to the relay output.
Use this function to define the measuring mode for the relay output.
Options:
0 = STANDARD
The relay output signal switches at the defined switch points.
1 = SYMMETRY
The relay output signal switches at the defined switch points, irrespective of the
sign. If you define a switch point with a positive sign, the relay output switches as
soon as the value is reached in the negative direction (negative sign), (see
illustration).
Factory setting: STANDARD
A0001247
Fig. 31 : Example for the SYMMETRY measuring mode
Switch-on point Q = 4
Switch-off point Q = 10
m = Relay energized
n = Relay de-energized
! Note!
• SYMMETRY cannot be selected unless the values in the ON-VALUE (4701)
and OFF-VALUE (4703) 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.
TIME CONSTANT
MODBUS register:
Relay output 1
Relay output 2
Data type:
Access:
4706
3811
4011
Float
read/write
Use this function to enter a time constant defining how the measuring signal
reacts to severely fluctuating measured variables, either very quickly (enter a low
time constant) or with damping (enter a high time constant).
Damping acts on the measuring signal before the switch status changes, and
consequently before switch-on or switch-off delay is activated.
The purpose of damping, therefore, is to prevent the relay output changing state
continuously in response to fluctuations in flow.
User input: fixed-point number: 0.00 to 100.00 s
Factory setting: 0.00 s
Function description
OUTPUTS → RELAY OUTPUT (1 to 2) → CONFIGURATION
0
-4
-10
4
10
Q
t
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