Endress+Hauser Proline Promass 83 - Page 61

Device Functions Proline Promass 83 MODBUS RS485 7 Block OUTPUTS
Endress+Hauser 61
VALUE 0_4 mA
MODBUS register:
Data type:
Access:
4002
5803
Float
read/write
Use this function to assign the 0/4 mA current a value.
The value can be higher or lower than the value assigned to 20 (function VALUE
20 mA (4003), see Page 62). Positive and negative values are permissible,
depending on the measured variable in question (e.g. mass flow).
Example:
4 mA assigned value = - 250 kg/h
20 mA assigned value = +750 kg/h
Calculated current value = 8 mA (at zero flow)
! Note!
Note that values with different signs cannot be entered for 0/4 mA and 20 mA
(function 4003) if SYMMETRY is the setting selected for the MEASURING MODE
function (4004). In this case the message “INPUT RANGE EXCEEDED” appears
on the display.
A0001223
Fig. 14 : Example for the STANDARD measuring mode
1 Initial value (0 to 20 mA)
2 Lower signal on alarm level: depends on the setting in the function
CURRENT SPAN
3 Initial value (4 to 20 mA): depends on the setting in the function CURRENT
SPAN
4 Full scale value (0/4 to 20 mA): depends on the setting in the function
CURRENT SPAN
5 Maximum current value: depends on the setting in the function CURRENT
SPAN
6 Failsafe mode (upper signal on alarm level): depends on the setting in the
functions CURRENT SPAN and FAILSAFE MODE
A Measuring range
User input: 5-digit floating-point number, with sign
Factory setting: 0 [kg/h] or 0.5 [kg/l] or −50 [°C]
! Note!
• 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).
" Caution!
The current output responds differently, depending on the parameters set in the
various functions. Some examples of parameter settings and their effect on the
current output are given in the following section.
Function description
OUTPUTS → CURRENT OUTPUT 1 → CONFIGURATION
0
3
4
5
6
I[mA]
2
A
1
Q