leuze electronic faq

Frequently Asked Questions For Leuze IO-Link Technology

Leuze Electronic 4/6/2018

Any individual connection can be extended to a maximum of 20 m.

How fast is signal transmission via an IO-Link connection?

The typical signal transmission time for a value of up to 16 bits in length is 2 ms.

Is it possible to transmit safety-relevant data such as emergency stop commands via IO-Link?

The transmission of safety-relevant data is not planned at present.

How is voltage disconnection achieved for drive systems?

The potential-free contact is achieved using pin 2 and pin 5. For this purpose, a 5-pin standard cable is to be used.

What must be observed when wiring?

Standardized 3-wire connecting cables or single strands in the switch cabinet are used. No shielding is required.

What type of connectors are required on the sensor side?

No special IO-Link plugs or cables are required. The recommended minimum cross-sections must be adhered to. For 20m conductor lengths, the minimum cross-section is 0.34mm². As unshielded cables can be used, M8 and M12 standard plugs are certainly the most commonly used.

What data are transmitted using IO-Link?

User data (e.g., analog values, switching states) are cyclically transmitted, configuration data (e.g., activation, deactivation of functions) and identification data (manufacturer identifier) typically during start-up and parameters (sensitivity, switching threshold) on a demand-driven basis.

What happens if an IO-Link proximity switch is defective and an identical replacement is not available?

An IO-Link proximity switch (a switching output) can also be exchanged with a corresponding standard proximity switch. Automatic identification, reconfiguration and other communication capability-related functions are then not available. In this case, only the switching signal is transmitted.

Which sensors without IO-Link capability can be connected to an IO-Link (master)?

Standard PNP outputs or PushPull outputs.

Is mixed operation of IO-Link and conventional devices possible?

Both device types can be operated on a mixed basis within one system.

What is IO-Link in relation to AS-i?

• A system which supplements intelligent wiring systems such as AS-Interface
• IO-Link is based on conventional point-to-point wiring
• IO-Link is directly integrated in the sensor
• IO-Link does not require a special cable
• IO-Link does not require sensor addressing
• IO-Link has no user limit

Is IO-Link a competitor to AS-i?

No, since:
• it is a point-to-point wiring system
• it is a supplementary system on the lowest field level
• it does not solve wiring problems

Why is IO-Link needed?

IO-Link is needed because:
• It closes the communication gaps at the lowest field level
• It renders machines and systems capable of validation right down to the lowest sensor and actuator level
• It minimizes interfaces (PNP, PushPull, 4-20mA, 0-10V, RS232, RS422 become IO-Link)

What changes in terms of installation and application?

• In terms of wiring technology, everything remains the same
• NPN sensors cannot be connected to IO-Link
• All previously known communication structures in higher-level systems do not change

Is the system simpler than known communication structures?

• Higher-level communication structures are generally bus systems
• IO-Link is a point-to-point connection

How can I integrate the system into known field bus technologies?

• Using currently known technologies
• No special IO-Link integration / engineering tools are planned