Figure 5, Powering daisy-chained comms kits on – Rockwell Automation 20-XCOMM-DC-BASE DPI External Comms Kit User Manual
Page 4
Publication 20COMM-IN001D-EN-P – May 2007
P/N 319869-P04
Supersedes 20COMM-IN001C-EN-P – July 2006
Copyright © 2007 Rockwell Automation, Inc. All rights reserved. Printed in USA.
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Power, Control and Information Solutions Headquarters
Electrical Connections
Powering a Single Comms Kit
The DC output plug is connected to the mating DC ADP
connector on the 20-XCOMM-DC-BASE.
Powering Daisy-Chained Comms Kits
Additional Comms Kits can be powered by daisy-chaining
them together. For each Comms Kit in the chain, connect all
DC “+” terminals together and all DC “-” terminals together
(
Figure 5 Powering Multiple Comms Kits via Daisy Chaining
The number of Comms Kits that can be daisy-chained
together is dependent on:
• Total current consumed by all of the communication
adapters being daisy-chained. For adapter current
consumptions at 24 VDC, see
• Whether or not an I/O Board option is installed. If it is,
the I/O Board consumes 60 mA @ 24VDC.
• Available current output capacity of the AC-to-DC
converter being used.
The following two examples explain how to determine the
number of daisy-chained Comms Kits that can be powered:
Example 1: Suppose the Comms Kits being daisy-chained
each have an installed 20-COMM-E EtherNet/IP adapter
and I/O Board option, and that the kits will be powered by
the 20-XCOMM-AC-PS1 converter which has an output
capacity of 830 mA.
Since the current consumed by one Comms Kit is 200 mA
(140 mA for the 20-COMM-E plus 60 mA for the I/O
board), divide the power source’s available output capacity
by this consumption (830 mA
÷
200 mA = 4.15), and round
down the result. For this example, 4 daisy-chained Comms
Kits can be powered.
Example 2: Suppose the Comms Kits being daisy-chained
each have an installed 20-COMM-C ControlNet adapter, and
that the kits will be powered by the 20-XCOMM-AC-PS1
converter which has an output capacity of 830 mA.
Since the current consumed by one Comms Kit is 105 mA,
divide the power source’s available output capacity by this
consumption (830 mA
÷
105 mA = 7.90), and round down
the result. For this example, 7 daisy-chained Comms Kits
can be powered.
AC Power Adapter Specifications
TIP: It is highly recommended to use twisted wire
pairs for better noise immunity.
Comms Kits
(20-XCOMM-DC-BASE)
AC-to-DC Converter
(20-XCOMM-AC-PS1)
. . .
+ -
+ -
+ -
+ -
TIP: When using the DC power source to also power
the additional I/O, subtract the required I/O current
from the power source capacity before making the
calculation.
Input
Rated Input Voltage
Operating Input Voltage
AC Input Frequency
100 - 240 VAC
90 - 264 VAC
47 - 63 Hz
Output
Output Voltage
Output Current
24 VDC
830 mA
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