The mechanical ON/OFF function will be explained.

Type of Control Method

There are four typical specifications for these.
These four are not options, but a combination of the four constitutes one specification.

There are four typical specifications for these.
These four are not options, but a combination of the four constitutes one specification.

1) No Voltage / Voltage
This is the difference between "Activate function by short circuit of terminal" or "Activate function by applying voltage to the terminal".

2) Single Activation / Binary Activation
When it is written as [control output vs activated function],
The difference is that the former corresponds to [N vs N], the latter corresponds to [Nvs 2N- 1].

3) Normally Open/ Normally Close
This is the difference between ON/OFF of the device and start / stop of the function.

4) Level / Pulse
This is the difference whether it is ON all the time while the function is running, or ON for a very short time.
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1) No Voltage / Voltage

This is the difference between "Activate function by short circuit of terminal" or "Activate function by applying voltage to the terminal". (Only this item has a lot of content.)

<< No Voltage >>
The function is activated by short-circuiting the two control terminals. There are input side and output side.

Combining input and output, the control signal is transferred from the equipment to the equipment.

Connection conditions
Input and output cannot always be connected. Whether or not these can be connected depends on the specifications of the terminals.
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The current flows simultaneously with the short circuit by the control voltage applied on the control output side. Each function is activated by this current. Whether control output and control input can be connected or not depends on the specifications (voltage and current) of each terminal.

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[Relay / Open collector]
Terminal types further include relays and open collectors. This is a difference in the parts that make up the control terminal. This content may be difficult to understand unless you have knowledge of electrical circuits. If you want to skip below, simply understand it like this.

• Relay terminals should be selected for safety.
  
• If product only has open collector terminals, it is ideal to connect the relay behind the open collector terminals.

Below, the differences between the two will be explained as simply as possible.

Relay

Electromagnets are used. When the trigger causes current to flow, the magnetic force generated in the electromagnet closes the circuit. Safety is ensured by physically separating the circuit before and after the relay. There are also types that can withstand large voltages and currents.

Simple drawn circuit

Open Collector

By using the properties of the transistor, it behaves as if switching by relay. It is brittle compared to a relay, so it should not be connected directly to the control input. Basically, relay is connected to the latter stage and it is used as the source of operating current of the relay.

Simple drawn circuit

​The figure below is a simplified circuit diagram when a relay is connected to an open collector.

Simple drawn circuit

So why do devices with open collectors are made? There are two reasons for that.
One is that open collectors are smaller and less expensive than relays.
Another reason is that when adopting a relay, withstand voltage and withstand current are fixed. For example, the voltage applied from the controlled side may be greater than the withstand voltage of this relay. An open collector is adopted as a trigger for operating various external relays that can correspond to various controlled sides.

<< Voltage >>
Apply voltage to the output side and activate the function by applying this voltage to the input side due to short circuit.

             These are also classified as <<Voltage>>.

​2) Single Activation / Binary Activation

There are also differences between the single mode and the binary mode as a difference in starting method.

3) Normally Open and Normally Close

The above assumes that "ON means Close" and "OFF means Open", but the opposite pattern is also possible. In other words, there are terminals with specifications such as "ON means Open" and "OFF means Closed."

Normally Open (NO)
The terminal is open when it is OFF.
The control output closes (ON) in conjunction with the function.

Normally Close (NC)
The terminal is closed when it is ON.
The control output opens (OFF) in conjunction with the function.

An example of NO and NC in no voltage output.
While the function of "S" is running, link the function "A" has. While the function of "S" is running, stop the function "B" has.

4) Level and Pulse

They are classified based on how the function moves when the control is turned on.

LEVEL
The function operates in conjunction with control ON. When controlled by a switch, the function continues to operate as long as the switch is pressed. The function will stop when you release the switch.

PULSE
Once the control is turned on, the function will continue to operate even if the control is turned off immediately.
If you turn the control ON again, the function will stop.