Siemens 9810 Series, User Manual, Page: 75 / 218

Inputs / outputs
Related Topics
• Option I/O modules configuration
Analog outputs
Analog output applications
You can use an analog output to send a signal to an external analog input, for
example an analog-controlled valve, to modify a water pipe’s valve position in
order to change the flow rate.
For analog output operation, your meter takes an input value and scales it to the
appropriate signal value to send out the physical analog output port.
Your meter’s analog I/O option modules can output either low voltage or current
using standard analog transducers such as 4 - 20 mA current transducers.
Related Topics
• Option modules
Analog output behavior
Your meter’s analog output, once configured, outputs voltage or current signals. If
your meter’s analog output source becomes unavailable (N/A) the analog output
level should go to zero (0 V / 0 mA) under most conditions.
When your meter is powered off or configured to send voltage, the meter registers
as a high impedance.
The electrical signal on the analog output is DC; make sure proper polarity is
observed when wiring external devices to the analog output ports.
Analog output zero scale and full scale values
Configure your analog output’s zero and full scale values.
In most cases, your meter’s analog output range matches the range of the analog
sensors that your meter’s outputs are connected to. In that case, your meter’s
analog output zero scale and full scale values are the maximum and minimum
values of the source driving your meter’s analog output. These values are used to
normalize the source value to a value between 0 and 1 which is applied to the
operating range of the analog output port to determine the analog output current
or voltage. For example:
Source value Analog output
values Meter’s analog
output Analog sensor
0 to 120 kW range
100 kW
Full scale = 120 (kW)
Zero scale = 0 (kW)
Normalized: 0.83
4 - 20 mA range
Output: 17.28 mA
4 - 20 mA range
If your meter’s analog output range does not match the range of the connected
analog sensor, you must calculate the full scale and zero scale values by
analyzing the system.
See the ION Reference , available from www.usa.siemens.com/pds for detailed
information about the Analog Output module and full scale and zero scale
calculations.
Configuring option module analog outputs using ION Setup
You can configure option module analog outputs using ION Setup.
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