Siemens ULTRAMAT 23 - Page 135

Functions
8.4 Configuration
ULTRAMAT 23
Manual, 3/2016, A5E37100388-003
135
Analog output 0/2/4/NAM mA (start-of-scale value of analog output)
You can set the following start
-of-scale values for the analog
current range in the 3rd line:
•
0 mA
•
2 mA
•
4 mA
•
NAMUR
You can switch suppression of negative measured valu
es on
or off in the 4th line. The "ON" option is preset, and means that
negative measured values can also be output. With a setting of
2 or 4
mA as the lower limit, values below this down to 0 mA
can therefore be output, i.e. negative measured values can b
e
displayed (live zero).
If the output of negative measured values is switched off
("OFF
" position), the current output is limited to the start-of-
scale value.
I
f 2 or 4 mA is set as the lower limit, the output is now indeed
limited to 2 or 4
mA. In the adjacent display, the start-of-scale
value of the analog current range is set to 4 mA.
The following tables represent the correlation between analog current outputs and
measuring range limits.
Table 8- 1 Start-of-scale value of the analog current output
Selectable
Analog current
(neg. MV on)
Analog current
(neg. MV off)
0 - 20 mA
0 mA
0 mA
2 - 20 mA
2 mA
2 mA
4 - 20 mA
4 mA
4 mA
NAMUR - 20 mA
4 mA
4 mA
Table 8- 2 Start-of-scale value of the analog output current for downward limiting of measured value
Selectable
Analog current
(neg. MV on)
Analog current
(neg. MV off)
0 - 20 mA
0.0 mA
0.0 mA
2 - 20 mA
0.0 mA
2.0 mA
4 - 20 mA
0.0 mA
4.0 mA
NAMUR - 20 mA
3.8 mA
4.0 mA