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3-2SectionSelecting an Installation Site
36
3-1 Design Precautions
Observe the following precautions when designing a system incorporating a
CPM2B PC.
3-1-1 Power Supply Wiring
Separate the power supply wiring from the power system, control system,
CPM2B system, and DC I/O system wiring. Separate the control circuits that
supply power to the main Unit from the main circuits using dedicated circuit pro-
tectors and fuses.
3-1-2 Power Supply Voltage
Caution Use the power supply voltages indicated in Section 2-1 Specification. Failure to
adhere to the specifications may result in fire.
If the power supply voltage falls below 85% of the rated voltage, the CPM2B will
stop and all outputs will be turned OFF. If low voltage affects the equipment, etc.,
provide a protection circuit which shuts off the output until the supply voltage re-
turns to the rated value.
In places where power supply conditions are poor, take steps to ensure that
power is supplied at the rated voltage. Be sure to adhere to safety precautions,
such as providing breakers to prevent short circuits in external wiring.
When conducting any of the following operations, turn OFF the power to the PC.
Electrocution, product damage and malfunction may result.
• Connecting or disconnecting Expansion I/O Boards and CPU Boards.
• Assembling equipment.
• Connecting cables and wiring.
3-1-3 Interlock and Limit Circuits
WARNING Emergency stop circuits, interlock circuits, limit circuits, and similar safety
measures must be provided in external control circuits (i.e., not in the
Programmable Controller) to ensure safety in the system if an abnormality
occurs due to malfunction of the PC or another external factor affecting the PC
operation. Not providing proper safety measures may result in serious
accidents.
The following diagram shows an example of an interlock circuit.
Interlock Circuit
Motor forward
Motor reverse
CPM2B
01005
01006
MC1
MC2
MC2
MC1
In the interlock circuit above, MC1 and MC2 can’t be ON at the same time even if
CPM2B outputs 01005 and 01006 are both ON (an incorrect PC operation).
3-2 Selecting an Installation Site
The CPM2B is resistant to harsh conditions and highly reliable, but installing the
PC in a favorable site will maximize its reliability and operating lifetime.