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2-1-4
Machine Number Switch
Use the unit number switches to set the unit number specific for each Special I/O Unit mounted in a
CPU Rack or Expansion Rack. The unit number must be the one registered in Unit Configurations.
Turn OFF the Controller before changing the Unit number setting.
One High-speed Counter Unit occupies areas for four special I/O Units in a CPU Unit.
Precautions for Safe Use
Always turn OFF the controller power before setting the Unit number.
Precautions for Correct Use
Precautions for Correct Use
• When setting a rotary switch, use a flat-blade screwdriver and be careful not to damage the
switch.
• Be sure not to leave the rotary switch midway between numbers.
Additional Information
• If two or more Special I/O Units are set to an identical Unit number or if one Special I/O Unit is
set to areas of plural Unit numbers, the CPU Unit has a major fault level error "Duplicate Unit
Number" and stops operation.
• After correcting the Unit number setting, cycle the power to the Controller.
• One High-speed Counter Unit occupies allocation areas of four Unit numbers. Be sure that no
Unit numbers are duplicated. To avoid duplication, when you set a High-speed Counter Unit to
the Unit number "n", set the next Special I/O Unit to the Unit number "n + 4".
CJ-series High-speed Counter Units Operation Manual for NJ-series CPU Unit(W492)
2 Components, Installation and Wiring
MACH
No.
1
X10
0
X10
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2-5
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