Power Budgeting; What Is Power Budgeting - AutomationDirect C0-USER-M Manual

Chapter 2: Specifications

Power Budgeting

What is Power Budgeting?

There are two areas that need to be considered when determining the power required to
operate a CLICK PLC system. The first area is the power required by the CLICK PLC, along
with the internal logic side power that the PLC provides to its own I/O and any connected
I/O modules that are powered through the PLC expansion port, plus any device, such as a
C-more Micro-Graphic panel, that is powered through one of the PLC's communication
ports.
The second area is the power required by all externally connected I/O devices. This should be
viewed as the field side power required. The field side power is dependent on the voltage used
for a particular input or output device as it relates to the wired I/O point, and the calculated
load rating of the connected device
It is strongly recommended that the power source for the logic side be separate from the power
source for the field side to help eliminate possible electrical noise.
Be aware that the CLICK PLC unit sinking DC output points require a sustained voltage to
work with their output drivers. This includes the C0-00DD1-D PLC, and the C0-08TD1
& C0-16TD1 output modules. It is recommended that this voltage be provided from the
field side power source.
The CLICK PLC operates from a 24VDC power source. The 24VDC power source can
be provided by an optional CLICK PLC unit power supply (C0-00AC or C0-01AC), or a
standard industrial 24VDC power supply as offered by AutomationDirect.
CLICK 24VDC Power Supply Alternative 24VDC Power Supply
C0-00AC or C0-01AC Example: PSP24-DC12-1
Visit www.automationdirect.com for the complete line.
The power source for the connected I/O devices is dependent on the voltage rating of the
devices and the type of CLICK I/O module that is being used.
Power Budgeting requires the calculation of the total current that the 24VDC power source
needs to provide to CLICK PLC unit logic side, and also a separate calculation of the total
current required from all devices operating from the field side of the CLICK PLC system.
Refer to the following pages which includes tables listing the CLICK PLC and I/O module
current requirements, plus a power budgeting example.
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CLICK PLC Hardware User Manual, 6th Edition, Rev. F – C0-USER-M