2) Power Supply Lines
• The power supply lines for the FP1, I/O devices and motorized devices should be isolated as shown below.
• Design the power supply lines for the Control Unit, Expansion Unit, and Intelligent units (FP1 A/D Converter Unit
and FP1 D/A Converter Unit) and FP1 I/O Link Unit so that the power for each can be turned ON and OFF at the
same time.
• Use twisted pair cable with 2 mm
2
or larger conductors as the power supply lines.
• Excessive noise and line voltage fluctuations can result in FP1 CPU misoperation or in system shutdown. To
prevent accidents caused by noise and line voltage fluctuations, be sure to employ countermeasures (such as use of
an insulated transformer, etc.) when wiring the power supply lines.
3) Momentary Power Drop
• The FP1 is not influenced by momentary power drops (less than 10 ms).
4) Safety
• In certain applications, malfunction may occur for the following reasons.
Power on timing differences between the FP1 Control Unit and I/O or motorized devices.
An operation time lag when a momentary power drop occurs.
Abnormality in the FP1, power supply circuit, or other devices.
• In order to prevent malfunction from resulting in system shutdown, the following special attention is required.
Start up sequence:
The FP1 should be operated after all of the outside devices are energized. To keep this sequence, the following
measures are recommended.
Set the Mode selector from PROG. mode to RUN mode after power is supplied to all of the outside devices.
Program the FP1 so as to disregard the inputs and outputs until the outside devices are energized.
Emergency stop circuit:
Add an emergency stop circuit to controlled devices in order to prevent a system shutdown or an irreparable
accident when malfunction occurs.
Interlock circuit:
When two motions that are opposed to each other are controlled, add an interlock circuit between the
programmable controller's outputs and the control device.
Example:
When a motor clockwise/counter-clockwise operation is controlled, provide an interlock circuit that prevents
clockwise and counter-clockwise signals from inputting into the motor at the same time.
Motorized
device
I/O device
FP1
Control
Unit
FP1
Expansion
Unit
Circuit
breaker
Circuit
breaker
Insulated
transformer
Twisted pair cables
FP1-025-93-B
Circuit breaker
FP1
Intelligent
Unit
44
3-3. Wiring
Example:
Summary of Contents for FP1
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