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4
I/O interf
ace
4-18
2. Ratings
For details regarding the definition of NPN and PNP specifications, refer to "7. I/O connections" in Chapter 3.
2.1 Input
NPN specifications PNP specifications
Method
DC input (positive common type)
Photo-coupler insulation method DC input (negative common type)
Photo-coupler insulation method
Input power 24 V DC ±10%, 5.1 mA/point 24 V DC ±10%, 5.5 mA/point
Load
ON voltage: 4.0 Vmax (4.2 mA) ON voltage: 11.6 Vmin (2.7 mA)
OFF voltage: 9.9 Vmin (3.0 mA) OFF voltage: 4.6 Vmax (1.1 mA)
Response time 2 ms or longer, or 4 ms
*1
or longer 2 ms or longer, or 4 ms
*1
or longer
*1 When three or more optional I/O interface boards are installed.
2.2 Output
NPN specifications PNP specifications
Method
NPN open-collector (negative common type)
Photo-coupler insulation method PNP open-collector (positive common type)
Photo-coupler insulation method
Load 24 V DC ±10%, 50 mA/point (resistance load) 24 V DC ±10%, 50 mA/point (resistance load)
Residual voltage 1.0V 1.0 V
Response time 2 ms or longer, or 4 ms
*1
or longer 2 ms or longer, or 4 ms
*1
or longer
*1 When three or more optional I/O interface boards are installed.
3. Caution items
1. When using a dual-lead proximity sensor as an input signal, check that the electrical specifications of
the sensor output signal are within the input signal specifications of the controller. For example, if the
residual voltage is large at turn on/off, this may cause malfunction.
2. Take noise countermeasures 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 over-current protective circuit shuts off the
interface circuit. Once this circuit is activated, it may be required to replace parts in order to restore it to
its previous state.
Furthermore, be sure to perform the operation within the rated load, or heat generated inside may lead to
burning damage.
4. As noise countermeasures, keep the machine power cables separate or make sure wires are well shielded.
5. When the controller main body is turned off, do not supply the external 24 V DC power to the I/O
interface continuously. Otherwise, the controller may malfunction.