GE Optica - Analog Outputs

Installation 2-9
January 2006
Analog Outputs Note: When the Optica is being programmed, the analog outputs
provide 4–20mA and 0–5 VDC signals representing the
designated parameters.
• For 4–20mA output, connect to terminals labelled 4–20 (+) and
RTN (–).
Note: The maximum load allowed for current output is 500 Ohms.
• For 0–5 VDC output, connect to terminals labelled 0–5 (+) and
RTN (–).
Note: The maximum load allowed for voltage output is 5 mA.
Example: Assume a temperature output, scaled to range from 0°C (Tlower) to
100°C (Tupper), with a measured actual temperature of 23°C
(Tactual):
The voltage output is calculated by:
yielding an output voltage of 1.15V.
The current output is calculated by:
yielding an output current of 7.68 mA.
Vout
Tactual Tlower–()
Tupper Tlower–()
----------------------------------------------
5×=
23 0–()
100 0–()
---------------------
5× 1.15V=
Iout mA()
Tactual Tlower–()
Tupper Tlower–()
----------------------------------------------
20 4–()× 4+=
23 0–()
100 0–()
---------------------
16()× 4+ 7.68mA=