Fairbanks X SERIES PR 5220 ETHERNET TRANSMITTER - Manual (Page 22)

Section 3: Installing the Instrument
05/11 23 51209 Revision 2
3.2.9 3 Optocoupler Inputs
The optocoupler inputs have one common potential (GND) for the input group that is separated
from the common potential of the output group.
Connection method: 4-pin plug-in terminal block
Cable:
Shielded, max. 50 m
Number of outputs: 3
Input signal:
External supply required
10 ... 28 V DC for 'high' level
0 ... 5 V DC for 'low' level
Input voltage: Max. 28 V DC
Input current: < 11 mA @ 24 V DC
< 5 mA @ 12 V DC
Electrical isolation: Yes; a common minus potential for the
group of 3 inputs
Example: contact input connection
When a voltage >= 10 VDC is applied to the terminals (in
the example :1-GND), input 1 is active (true).