Frequently asked questions
Why is IO-Link needed?
O-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, 4-20 mA, 0-10 V, RS232, RS422 become IO-Link).
Is IO-Link another fieldbus?
ny individual connection can be extended to a maximum of 20 m.
How fast is signal transmission via an IO-Link connection?
he typical signal transmission time for a value of up to 16 bits in length is 2 ms.
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.
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 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.
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 connectors or cables are required. The recommended minimum cross sections must be adhered to. For 20 m cable lengths the minimum cross section is 0.34 mm². As unshielded cables can be used, M8 and M12 standard connectors are certainly the most commonly used.
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.
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.
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.
How is IO-Link positioned?
IO-Link is typically used in an automation environment below the I/O level for individual linking of field devices.
Where is IO-Link used?
IO -Link is used predominantly in an industrial environment in automated production for linking sensors and actuators.
What setting options do I have with IO-Link capable sensors and actuators?
This depends on the possibilities implemented by the manufacturer, but in general:
- Local operation using teach-in, setting potentiometers, etc.
- Event-driven program running using a connected controller.
- Operator-driven program running, e.g. using an HMI interface.
- Engineering system.
- Installation of a sensor in a pre-planned automation station with stored basic sensor settings.
This also enables dynamic changing of parameter settings. Automated new settings are also possible.
How does IO-Link function?
IO-Link is based on the familiar 3-conductor connection for a digital switching signal, in which the switching signal is issued as a serial telegram. This means additional information can be exchanged in the form of a serial protocol between the I/O level and the field device.
What is IO-Link?