Обзор

Обзор

IO-Link product range

IO-Link is a new, innovative and standardized communication standard for sensors and actuators - defined by PROFIBUS International (PI). The IO-Link technology is based on a point-to-point connection of sensors and actuators to the controller. It is not a bus system but it considerably enhances the conventional point-to-point connection. In addition to the cyclic operating data, comprehensive parameter and diagnostics data are transferred for the connected sensors/actuators. The same 3-wire connecting cable as currently used for standard sensors is used.

Components of an IO-Link system:

Only 2 components are required for using IO-Link:

  • IO-Link master
  • IO-Link device (e.g. IO-Link sensor/actuator, IO-Link I/O module)
Compatibility of IO-Link

IO-Link ensures the compatibility between IO-Link-capable and standard modules as follows:

  • IO-Link sensors/actuators can be operated both on IO-Link modules (master) and on standard I/O modules.
  • Both IO-Link sensors/actuators as well as current standard sensors/actuators can be used on IO-Link modules (master).
  • If conventional components are used in the IO-Link system, naturally only the standard functions are available in this case.
Expansion by IO-Link I/O modules

The compatibility of IO-Link also permits the connection of standard sensors/actuators, i.e. conventional sensors/actuators can also be connected to IO-Link. This can be implemented especially cost-effectively with IO-Link I/O modules that permit the connection of several sensors/actuators to the controller via one cable.

Analog signals

Another advantage of the IO-Link technology is that analog signals are immediately digitized in the IO-Link sensor and then digitally transferred via the IO-Link communication. This avoids interferences and additional overhead due to cable shields is omitted.

Integration in STEP 7

Integration of the device configuration in the STEP 7 environment ensures

  • Easy and quick engineering
  • Consistent data management
  • Quick locating and clearing of faults

Thus productivity is increased in all phases of the plant's life cycle - configuration, commissioning and operation. With the Siemens IO-Link solution, even sensors and actuators below the fieldbus level are optimally integrated with their complete performance capability in the Totally Integrated Automation (TIA) environment.

Область применения

There are two main fields of application for IO-Link. On the one hand, even complex sensors with a large number of parameters can be easily connected to the controller by means of IO-Link. On the other hand, by means of the IO-Link modules this technology turns into an optimum substitute for passive distributors when connecting binary sensors. In both fields of application all diagnostics data are transferred to the higher-level controller via IO-Link.

User benefit (example)

If a complex pressure transducer is used, numerous parameters (e.g. threshold values, hysteresis values) are set during commissioning to ensure smooth operation of the plant. Via IO-Link this data is transferred to the controller and stored there. Should this sensor fail, the sensor simply needs to be replaced. The required parameters are then called from the controller and transferred to the sensor via IO-Link. Without IO-Link, the sensor would have to be laboriously reparameterized on site.

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