Backup Power Supply - Omron CS1W-CLK12-V1 Operation Manual

Specifications and Configurations
1-2-8

Backup Power Supply

Backup Power Supply
Specifications
1,2,3...
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The node bypass function can be used if each Controller Link Unit and Board
is connected to a backup power supply. The node bypass function prevents
the entire network from shutting down if the power supply to a single PLC or
personal computer is interrupted.
Optical transmission path
PLC
The following table shows the input specifications required for backup power
supplies to Controller Link Units and Boards. Be sure that the backup power
supply being used meets these specifications. (We recommend the OMRON
S82K Series.)
Item
Voltage
Allowed voltage fluctuation
Current consumption
Inrush current
Note When using Controller Link Units in duplex operation in a CS1D System, pro-
vide backup power supplies for both the active and standby Controller Link
Units. If the backup power supply for the standby Unit is stopped, communica-
tions will be interrupted at that point and a disconnection will be detected.
When a single power supply is connected to several nodes or is some dis-
tance away from the node, make sure that the voltage at the node itself meets
the specifications in the table above. There will be some voltage drop in the
power supply wiring.
The power provided from the backup power supply will be used first if a
backup power supply is connected. Be sure to consider the following points
when designing the network.
1. Turn on the PLC or computer power supply after turning on the backup
power supply.
2. If the backup power supply goes on or off, any data being transmitted at
that moment will be corrupted.
3. Do not use the same power source to supply the backup power supply and
the PLC/computer. The node bypass function will not operate if the backup
power supply and the PLC/computer are both off.
4. Use a dedicated power supply for the backup power supply. Do not share
a power supply being used for I/O, motors, or control systems.
Use a backup power supply that is double-insulated or one with reinforced
insulation.
Always maintain the power supply voltage within specifications.
Bypass
PLC PLC
Power interruption
Specification
24 V DC
20.4 to 26.4 V DC (24 V DC –15% to +10%)
200 mA max. at 24 V DC (per node)
2.5 A max. (with a 24-V DC startup time of 5 ms)
Section 1-2
Computer
24-VDC
backup
power supply