Powering I/O Circuits With The Auxiliary Supply - Automation Direct DL205 Manual

In some cases, using the built-in auxiliary +24VDC supply can result in a cost
savings for your control system. It can power combined loads up to 300mA. Be
careful not to exceed the current rating of the supply. If you are the system designer
for your application, you may be able to select and design in field devices which can
use the +24VDC auxiliary supply.
Powering I/O All AC powered DL205 bases feature the internal auxiliary supply. If input devices
AND output loads need +24VDC power, the auxiliary supply may be able to power
Circuits with the
both circuits as shown in the following diagram.
Auxiliary Supply
DC-powered DL205 bases are designed for application environments in which
low-voltage DC power is more readily available than AC. These include a wide range
of battery–powered applications, such as remotely-located control, in vehicles,
portable machines, etc. For this type of application, all input devices and output
loads typically use the same DC power source. Typical wiring for DC-powered
applications is shown in the following diagram.
I/O Wiring and Specifications
AC Power
Power Input
DL205 System
Auxiliary
Input Module
+24VDC
Supply Inputs
–
+
+
+
DC Power
– –
DL205 System
Power Input
Input Module
Inputs
DL205 Installation and I/O Manual, Rev. B
Output Module
Com. Outputs Com.
Loads
Output Module
Com. Outputs Com.
Loads
3–3