Weidmüller’s SAI Bluetooth modules rated to IP 67:

Weidmüller is supplementing its SAI programme with SAI Bluetooth – reliable wireless communications for sensors and actuators. A recognised industry standard, Bluetooth (IEEE802.15.1) represents an interference-proof means of data communications and wireless networking across short distances – and no cables in sight. The new module is suitable for use in applications that are difficult to reach with bus cables, either because they are spread out or due to the physical conditions on-site – an aspect that also applies when plant components are rearranged. A single SAI Bluetooth gateway can communicate wirelessly with up to six slave stations. The Bluetooth gateway acts as a Profibus DP station, and at the same time it is a slave in the Profibus system. 12 DIs are integrated in the gateway. When extended to a maximum configuration, Weidmüller’s Bluetooth SAIs can create up to 31 piconets, each comprising a gateway and six Bluetooth slaves; that translates into as many as 186 Bluetooth modules. All stations are designed as field devices with protection class rating IP67. Requiring no optical data links, Bluetooth facilitates direct signal acquisition. Comprehensive individual channel diagnostics as well as an illuminated address section simplify troubleshooting procedures. Transparent markers support unambiguous signal assignments. The signal connection merely requires commercially available M12 plug-in connectors. Weidmüller offers the corresponding connectors and an extensive range of accessories for signal lines.

By adding SAI Bluetooth to its already extensive family of SAI products, Weidmüller is offering a reliable method of wireless communication for sensors and actuators. Operating in the licence-free 2.4 GHz ISM band, Bluetooth defines a universal radio interface. Due to the low transmitting power of several milliwatts, transmission ranges up to 100 meters are specified. SPP, the standardised Bluetooth profile is utilised and forms the basis for the communication protocol. It is implemented as WIRELESSopen on the basis of the CANopen standard. Weidmüller considers Industrial Wireless to be a technology that can provide solutions to problems in individual and defined areas of installation, but not as a general means to replace all cables used in industrial automation. As a key wireless technology, Bluetooth is suitable for non time-critical and non safety-relevant data transmissions. This wireless technology itself belongs to the field of conventional connection technology and is as such an original Weidmüller core competence. For this reason, Weidmüller is supplementing its successful SAI program with Bluetooth technology in order to generate a value-added benefit for is customers: wireless technologies reduce installation times, increase flexibility when retrospective alterations are made to facility plant and machinery, as well as saving costs for set-up, diagnostics and maintenance procedures.

SAI Bluetooth is fully consistent with Weidmüller’s classic SAI distributor concept. The well-known design and handling simplify installation work for users – the technology being easy to master. Configuration is carried out as usual with standard components in Profibus DP networks. Network transparency is assured right down to the individual wireless stations. For optimum convenience, the addresses are set in the illuminated address section. Each Bluetooth module is equipped with extensive diagnostic and status indicators – for operating voltage and communication. And, in addition, there are the generously sized backlit marker surfaces as well as LED status indicators shaped as arrows. Furthermore, the LED indicators change colour if an I/O error occurs.

SAI Bluetooth facilitates wireless transmissions of process data between SAIs and a gateway. Utilising Bluetooth SAIs from Weidmüller makes it possible to create 31 piconets, each comprising a gateway and six Bluetooth slaves (sub-bus stations); in other words, it is possible to operate a total of 186 Bluetooth modules in a single system. Configuration and address assignments in the Profibus DP network are made as usual on the basis of GSD files (Electronic Device Data Sheets). The Bluetooth master acts as a gateway to the Profibus and at the same time it is also a slave in the Profibus system. The gateways in the SAI Bluetooth concept are designed to operate as slaves; that means that they can process I/O information. That in turn means that sensors and actuators can be connected directly to the gateway.

The Bluetooth gateway is equipped with 12 integrated digital inputs of its own. Three Bluetooth slaves are sufficient to fulfil application requirements. A combi-module is available offering 16 DI/8DO with freely configurable channels: eight channels can be configured as inputs or outputs as required. That means it is possible to configure a wide variety of combinations such as 15 DI/ 1DO, 14 DI/ 2 DO through to 8 DI/ 8DO. The eight outputs on the module can be supplied with power in three groups; consequently they can be deactivated independently of one another – a noteworthy technical highlight. No software update is required when adding ‘new’ SAIs to the Bluetooth gateway. The cycle time for each and every SAI is under 15 milliseconds. And at the same time, the sub bus can accommodate an extension (radio range) of up to 20 meters.

The following products are available in the SAI Bluetooth programme: Profibus slave with 12 digital inputs and Bluetooth gateway function (master) for 6 Bluetooth slaves; Bluetooth slave with 16 digital inputs; Bluetooth slave with 8 digital inputs and 8 digital inputs or outputs (configurable); Bluetooth slave with 4 digital and 4 analogue inputs as well as 2 analogue outputs. Placing its confidence in standard accessories, not special accessories, Weidmüller uses solely M12 connectors for the signal connection. Weidmüller’s SAI programme, is rounded off by a comprehensive range of accessories.