Digital Output Modules; Overview; Switching Inductive Loads - semaphore KINGFISHER PLUS+ Hardware Reference Manual

12. DIGITAL OUTPUT MODULES

Overview

The digital output modules provide relay and transistor outputs to the Kingfisher Plus+ series
of RTUs.
The DO-1 and DO-2 offer relay outputs, eight and sixteen respectively, while the DO-6 is
transistor based.
The DO-6 is compatible with the TEL-REL-00x series of relay output boards to allow for
higher current and voltage switching.

Switching Inductive Loads

When switching inductive loads, users should be mindful of possible reduced relay service
life due to back-EMF. To mitigate this negative effect, suppression circuits should be used
when switching inductive loads.
Switching DC Supplied inductive loads (high switching relay output)
Switching DC Supplied inductive loads (ground switching relay output)
Hardware Manual Version 7.16
Kingfisher Plus+ Hardware Manual
http://www.servelec-semaphore.com/ Page 168