semaphore KINGFISHER PLUS+ Hardware Reference Manual page 128

Kingfisher Plus+ Hardware Manual
Actual terminals used and their pin-outs are shown in the specifications for the individual
modules.
Connecting an Analogue Input
An analogue device (e.g. transducer) can be connected using loop power (power from the
module) or it can be self-powered.
A loop-powered analogue device behaves like a variable load on the module. It is a two-wire
device with the positive wire being connected to the module's Field Power output and the
negative wire being connected to the Analogue Input of the module as illustrated below.
Loop Powered Analogue Device Connected to Analogue Input
A self-powered analogue device behaves like a current source to the module. A self-
powered device has at least three wires. One wire is connected to a positive terminal of an
external supply or to the Field Power output of the module. The second wire is connected to
Hardware Manual Version 7.16 http://www.servelec-semaphore.com/ Page 128