Endress+Hauser Proline Promass 83 - Page 70

7 Block OUTPUTS Device Functions Proline Promass 83 MODBUS RS485
70 Endress+Hauser
END VALUE
FREQUENCY
MODBUS register:
Data type:
Access:
4203
3205
Float
read/write
! Note!
Function is not available unless the FREQUENCY setting was selected in the
OPERATION MODE function (4200).
For defining a full scale frequency for the frequency output. You define the
associated measured value of the measuring range in the VALUE F HIGH function
(4205) described on Page 71.
User input: 5-digit fixed-point number: 2 to 10000 Hz
Factory setting: 10000 Hz
Example:
• VALUE F HIGH = 10000 kg/h, full scale frequency = 10000 Hz:
i.e. a frequency of 10000 Hz is output at a flow of 10000 kg/h.
• VALUE F HIGH = 3600 kg/h, full scale frequency = 10000 Hz:
i.e. a frequency of 10000 Hz is output at a flow of 3600 kg/h.
! Note!
In the FREQUENCY operating mode the output signal is symmetrical
(on/off ratio = 1:1). At low frequencies the pulse duration is limited to a
maximum of 2 seconds, i.e. the on/off ratio is no longer symmetrical.
VALUE F LOW
MODBUS register:
Data type:
Access:
4204
3207
Float
read/write
! Note!
Function is not available unless the FREQUENCY setting was selected in the
OPERATION MODE function (4200).
Use this function to assign a variable to the START VALUE FREQUENCY (4202).
The value can be higher or lower than the value assigned to the VALUE F HIGH.
Positive and negative values are permissible, depending on the measured variable
in question (e.g. mass flow). You define a measuring range by defining the VALUE
F LOW and VALUE F HIGH values.
User input: 5-digit floating-point number
Factory setting: 0 [kg/h] or 0 [kg/l] or −50 [°C]
! Note!
• For a graphic illustration of the VALUE F LOW, see the VALUE F HIGH (4205)
function.
• Note that values with different signs cannot be entered for VALUE F LOW and
VALUE F HIGH, if SYMMETRY is the setting selected for the MEASURING
MODE function (4206). In this case the message “INPUT RANGE
EXCEEDED” appears on the display.
• The appropriate unit is taken from the following functions:
– UNIT MASS FLOW (0400)
– UNIT VOLUME FLOW (0402)
– UNIT CORRECTED VOLUME FLOW (0404)
– UNIT DENSITY (0420)
– UNIT REFERENCE DENSITY (0421)
– UNIT TEMPERATURE (0422)
(see Page 15 till Page 18).
Function description
OUTPUTS → PULSE/FREQUENCY OUTPUT 1 → CONFIGURATION (FREQUENCY)