Monitoring relays with IO-Link protects motors and plant components

24 October 2011

The entire range of monitoring relays from Siemens has been equipped with the IO-Link interface to help the relays protect motors and plant components by monitoring parameters such as temperature, speed, network quality, current and voltage.

The relays communicate with the control level via IO-Link to transfer, for example, measured values and messages. The Sirius 3UG48 monitoring relays for electrical and mechanical measurements monitor the observance of parameter limits for speed, network quality, current, power factor (cos phi) or voltage. The Sirius 3RS14 and 3RS15 temperature monitoring relays have between one and three resistance sensors or thermocouples for controlling temperatures from -99 to +1,800°C, and can also be used for simple control tasks. The new monitoring relays can also fulfil their monitoring tasks without an IO-Link connection to a controller.

Connecting the Sirius relay via an IO-Link to the control level facilitates, central parameter assignment as well as detailed fault localisation and diagnostics. The devices have several LEDs and a display for showing actual values and can be used directly in the control cabinet for diagnostic purposes. The values are also displayed in the central control system via the IO-Link for simple further processing.

The relays are parameterised either directly at the device or from the central control system via the IO-Link. Data synchronisation with the higher-level control system ensures that the system documentation is up-to-date at all times. New parameters are automatically assigned by a parameter server, which makes it considerably easier to replace any devices. For efficient energy management, the Sirius relays 3UG48 also support the data formats defined in the PROFIenergy profile.

IO-Link is a communication standard for uniformly linking sensors and switching devices to the control level by means of a cost-effective, point-to-point connection. IO-Link facilitates central fault localisation and diagnostics down to sensor/actuator level, and simplifies commissioning and maintenance, because parameter data can be dynamically changed directly from the application. This helps to increase plant availability and lower engineering expenditure. As an open interface, IO-Link can be integrated into all conventional fieldbus and automation systems.

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