Endress+Hauser Proline Prosonic Flow 93C Description Of Device Functions page 39

Device functions Proline Prosonic Flow 93C PROFIBUS DP/PA
Endress+Hauser
OUTPUTS → CURRENT OUTPUT 1 → CONFIGURATION
VALUE 0_4 mA Use this function to assign the 0/4 mA current a value.
(4002) The value can be greater or less than the value assigned to 20 mA, (function VALUE
20 mA (4003)). Positive and negative values are permissible, depending on the measured
variable in question (e.g. volume flow).
Example:
4 mA assigned value = – 250 l/h
20 mA assigned value = +750 l/h
Calculated current value = 8 mA (at zero flow)
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.
Example for STANDARD measuring mode:
m
n
o
p
q
r
SPAN → Page 38 and FAILSAFE MODE → Page 45
A = Measuring range (the minimum measuring range has to exceed the value that correlates with a
flow velocity of 0.3 m/s)
User input:
5-digit floating-point number, with sign
Factory setting:
0 [unit]
!
• The appropriate unit is taken from the UNIT VOLUME FLOW function (0402) →
"
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.
(continued on next page)
Functional description
(only with PROFIBUS DP)
I [mA]
3
1
= Initial value (0 to 20 mA)
= Lower signal on alarm level: depends on the setting in the CURRENT SPAN function
= Initial value (4 to 20 mA): depends on the setting in the CURRENT SPAN function
= Full scale value (0/4 to 20 mA): depends on the setting in the CURRENT SPAN function
= Maximum current value: depends on the setting in the CURRENT SPAN function
= Failsafe mode (upper signal on alarm level): depends on the setting in the functions CURRENT
Note!
Page 13.
Caution!
6 Block OUTPUTS
6
5
4
2
0 Q
A
A0001223
39