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Design Precautions Section 3-1
3-1 Design Precautions
Observe the following precautions when designing a system incorporating a
CPM2C PC.
3-1-1 Power Supply Wiring
Separate the power supply wiring from the control system, CPM2C 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 protectors and
fuses.
3-1-2 Power Supply Voltage
!Caution Use the power supply voltages indicated in SECTION 2 Unit Components and
Specifications
. Failure to adhere to the specifications may result in fire.
If the power supply voltage falls below 85% of the rated voltage, the CPM2C
will stop and all outputs will be turned OFF. If low voltage affects the equip-
ment, etc., provide a protection circuit which shuts OFF the output until the
supply voltage returns 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 precau-
tions, 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 Units, Expansion Units, and
CPU Units.
• Assembling Units.
• Connecting cables and wiring.
• Connecting or disconnecting connectors.
• Replacing the battery.
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 Pro-
grammable Controller) to ensure safety in the system if an abnormality occurs
due to malfunction of the PC or another external factor affecting the PC oper-
ation. Not providing proper safety measures may result in serious accidents.
The following diagram shows an example of an interlock circuit.
In the interlock circuit above, MC1 and MC2 can’t be ON at the same time
even if CPM2C outputs 01005 and 01006 are both ON (an incorrect PC oper-
ation).
Interlock Circuit
Motor forward
Motor reverse
CPM2C
01005
01006
MC1
MC2
MC2
MC1
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