Analog Outputs - GE Optica Operator's Manual

2.4.1 Analog Outputs

Note: When the Optica is being programmed, the analog outputs provide 4–20 mA 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 current allowed for voltage output is 5 mA.
Example:
Assume a temperature output, scaled to range from 0°C (T
of 23°C (T ):
actual
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.
Optica™ Operator's Manual
(
T
actual
--------------------------------------- -
=
V
out
(
T
upper
( )
23 0
–
×
-------------------- -
( )
100 0
–
(
T
–
actual
( )
--------------------------------------- -
I mA =
out
(
T
–
upper
( )
23 0
–
-------------------- - × (
16
( )
100 0
–
) to 100°C (T ), with a measured actual temperature
lower upper
)
T
–
lower
×
5
)
T
–
lower
5 1.15V
=
)
T
lower
× ( )
20 4 +
–
)
T
lower
)
7.68mA
4
+ =
Chapter 2. Installation
4
15