Omron CRT1 - 10-2008, Operation Manual

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Power Supply Wiring Section 3-5
An OMRON S82-series Power Supply for the communications power supply
for CompoNet Slave Units is recommended.
Note For network power supply Slave Units, the external I/O power supply is also
provided through the Flat Cable from the communications power supply con-
nected to the Master Unit or the Repeater Unit.
When calculating the output current of the communications power supply,
always include the external I/O current consumption and actual load current
for network power supply Slave Units.
For example, the power supply current consumption for Bit Slave Unit is
expressed by the following formula.
• Input Bit Slave Units:
Communications power supply current consumption = Bit Slave Unit com-
munications current consu (Bit Slave Unit input current
×
number
of inputs used) + (sensor current consumption
×
number of sensors used)
• Output Bit Slave Units:
Communications power supply current consumption = Bit Slave Unit com-
munications current consu (actual load current
×
number of actu-
ators used)
• I/O Bit Slave Units:
Communications power supply current consumption = Bit Slave Unit com-
munications current consu (Bit Slave Unit input current
×
number
of inputs used) + (sensor current consumption
×
number of sensors used)
+ (actual load current
×
number of actuators used)
For details on current consumption for each Unit, refer to Appendix D Current
Consumption Summary .
3-5-2 Connection Locations for Communications Power Supplies
Round Cable I
A 24-VDC power supply is connected individually to each Slave Unit. Power
does not need to be supplied to the Master Unit.
Output current Use a power supply that equals or exceeds the following total
current consumption:
• The current consumption of all Word Slave Units and
Repeater Units
• The current consumption of all Bit Slave Units and the current
consumption of their external I/O
Insulation Between output and AC power and between output and chas-
sis ground
Item Specification
+ −
Master Unit
Open Type Connector
Round cable I
Communications
connector
24-VDC com-
munications
power supply
Supply communications power directly to each Slave Unit.
Word Slave Unit
Terminating Resistor
Open Type Connector
Open Type Connector
Open Type Connector
Word Slave Unit
Word Slave Unit
Overcurrent
protection (See note.)
(current limit: 4 A)
Note:
When complying with UL standards, install a
device to limit the current between the external
power supply and the Unit to 4 A or less for the
communications power supply.