Fairbanks X SERIES PR 5410 Process Indicator - Manual (Page 22)

Section 3: Installing the Instrument and Plug-In Cards
10/08 22 51207 Revision 1
3.3.3 Optocoupler Inputs
The main board has 3 digital inputs for process control, electrically isolated by optocouplers, each
bipolar potential-free.
Number of inputs: 3 ( CH1, CH2, CH3 )
Input signal: Logic 0: 0 to 5 VDC or open
Logic 1: 10 to 31 VDC
Passive, external supply required
Input current: < 7 mA @ 24 V
< 3 mA @ 12 V
Protected against incorrect polarity
Electrical isolation: Yes, via optocoupler
Connection:
Plug-in 7-pin screw terminal block,
cable shield connected to housing
(terminal 14), max. 1.5 mm² cable.
Cable: Shielded, max. 50 m
Example: connection of a contact input