Connecting The Communications Power Supply - Omron CJ Series Operation Manual

4 Installation and Wiring
Master Unit or
Repeater Unit
BS+
BDH
BDL
BS-
BS+
BS-
Communications power supply connector on Master Unit
or downstream port's communications power supply connector on Repeater Unit

4-4-1 Connecting the Communications Power Supply

The communications power supply must meet the following specifications. Commercially available
power supply units can be used. An OMRON S82-series Power Supply Unit is recommended to sup-
ply communications power to a CompoNet network.
Item
Output voltage
Output ripple
Output current
Insulation
With the Slave Units with a network power supply, the external I/O devices are also supplied power
through the communications power supply connected to the Master Unit or a Repeater Unit via Flat
Cables. Therefore, the output current of communications power supply must include the current con-
sumption and the actual load current of the external I/O devices the calculation.
The following is a calculation example of the current consumption for a Bit Slave Unit's communica-
tions power supply.
(1) Input Units
Current consumption of the communications power supply
= Current consumption of a Bit Slave for communications
+ (Input current of a Bit Slave x Number of used channels)
+ (Current consumption of a sensor x Number of used sensors)
(2) Output Units
Current consumption of the communications power supply
= Current consumption of a Bit Slave for communications
4-32
BD BD BS BS
H L + -
When complying with UL standards,
install a device to limit the current
Overcurrent protection
between the external power supply
(current limit: 4 A)
and the Unit to 4 A or less for the
communications power supply.
Communications
power supply
and I/O power
supply (shared)
24 VDC
24 VDC ±10%
600 mVp-p
Use a power supply that has a capacity equivalent or exceeding the following
total current consumption:
• The current consumption of all of Word Slave Units and Repeater Units, and
• The current consumption of all of Bit Slave Units and the external I/O devices
Between outputs and AC power, and between outputs and enclosure grounding
CJ-series CompoNet Master Unit Operation Manual for NJ-series CPU Unit (Cat. No. W493)
Round Cable II, Flat
Cable I, or Flat Cable II
Specification