Yamaha RCX240, User Manual

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Chapter 6 PARALLEL I/O INTERFACE
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Chapter 6 PARALLEL I/O INTERFACE
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4. Caution items
1. When using a dual-lead proximity sensor as an input signal, check whether or not it is
within input signal specifications.
If the sensor has a high residual voltage during on and off, this might cause possible
malfunctions.
2. Take noise preventive measures when using an inductive load such as a solenoid valve
as an output load. For example, connect a diode (high-speed type) in parallel at both
ends of a load, as a surge killer to protect against noise.
3. If a short occurs in the load or an excessive current flows, the internal over-current
protective circuit shuts off the interface circuit. Once this protective circuit is activated,
it is not possible to restore the previous state. Furthermore, heat generated inside might
damage the internal circuits, so always draw current only within the rated load.
4. As a noise prevention, keep the machine power cables separate and make sure wires are
well shielded.
5. Do not keep supplying the external 24V DC power to the standard and optional I/O
interfaces while controller power is off. The controller might malfunction if the external
24V is continuously supplied.
4. Caution items