Multi-Tech Systems 7500 - Manual (Page 226)

Configuring Analog Output ION 7500 / ION 7600 User’s Guide
Page 226 Digital and Analog I/O Technical Note
Configuring Analog Output
An ION meter’s analog outputs act as transducers. The meter measures power and
energy, and then sends that information via the analog outputs to a remote
terminal unit (RTU). The analog outputs issue industry standard 0 to 20 mA
current signals.
Analog Output Module
Analog outputs allow you to control external devices by delivering a specific
current or voltage that is proportional to your source point. The Analog Output
module takes an input value and scales it to the appropriate values for output to
an analog hardware port. It also provides the scaled value as an output register
that can be accessed by other modules.
Ordering options on some ION meters provide analog outputs that can deliver a
continuous dc signal. The accuracy of analog outputs for ION meters is ±0.3% of
full scale. The following varieties are available—be sure to check the device label
to determine your option:
An ION 7300 Series TRAN meter with an analog output card cannot be ordered
with a remote display (RMD).
Analog Output Module Setup Registers
An ION Analog Output software module corresponds to each hardware output
port. This module takes a numeric value and scales it for output to an analog
hardware port, allowing you to control external devices by delivering a specific
current or voltage. The register settings let you determine the value that appears
in the output register when the lowest and highest possible values from the
hardware are applied, and determine the hardware port that the module will
control.
To learn more about the Analog Output module scaling, refer to the section
“Setting Analog Zero and Full Scale Values” on page 227.
Analog Output Option Maximum Load
-1 to 1 mA (scalable to 0 to 1 mA) 10 Ω
0 to 1 mA 10 Ω
0 to 20 mA (scalable to 4 - 20 mA) 500 Ω
-20 mA to 20 mA 500 Ω
Setup Register Description
Zero Scale
Should be set to the value on the Source input that will create the minimum
possible output on the analog hardware port
Full Scale
Should be set to the value on the Source input that will create the highest
possible output on the analog hardware port
Port Defines the hardware port where the output appears