ProMinent DULCOMETER diaLog DACb Assembly And Operating Instruction page 134

[Control]
Setting the
Fig. 88: Remote setpoint via a 0/4 ... 20 mA analogue signal
Description
Function
Signal source
Area
4 mA
20 mA
Assignment
Applicational example:
In a process control system, several different
pH setpoints must be reached in steps and
then maintained. The system is controlled using
a PLC Programmable Logic Controller. The
PLC Programmable Logic Controller indicates
the required standard signals to the controller
via an analogue mA output. The controller auto‐
matically regulates based on the setpoint. The
controller can report the current pH value to the
PLC Programmable Logic Controller via an
analogue mA output.
134
Remote setpoint
Function
Signal source
Range
4mA =
20 mA
Assignment
Factory setting
Off
Fixed, mA input 2
4...20 mA
Dependent on the measured
variable and measuring
range
Dependent on the measured
variable and measuring
range
Fixed, channel 1
3.3.1
On
mA output 1
4 ... 20 mA
1.00 ppm
1.00 ppm
Channel 1
A1477
Setting options
On/Off
0...20mA/4...20mA
Dependent on the measured variable and
measuring range
Dependent on the measured variable and
measuring range
Electrical connection
The 0/4 ... 20 mA analogue signal
specifies the setpoint and is connected
to terminals XE8 3 (-) and 4 (+) of the
extension unit.