PLCS & INDUSTRIAL PCS SUPPLEMENT FEATURE High speed solutions
The growing level of automation in machines and systems has increased the volume of data being transferred, above all in real time. ‘Industrial Ethernet’ is the right and advanced solution to solve this problem. Ethernet technology has been established in the office environment for many years. The same technology has now been extended into the industrial environment down to field level. Products need to meet the requirements of harsh industrial environments. Murrelektronik offers a connector program for these applications
E
thernet solutions, in their earliest form, have been around since the 1970s. In the 1980s the first considerations were made regarding a general standard - Ethernet version 1 from the year 1980 and the ISO/DIS-8802/3 standard from 1985 were important milestones. The 100Mbit/s standard for Fast Ethernet according to IEEE 802.3u from 1995 was also a significant step ahead. Today it is the basis for both Ethernet and Fast Ethernet and it is an established standard for office communication. In factory automation, automation systems used fieldbus systems, for example Profibus. This became a general communication standard. Both Ethernet
interesting applications. Remote maintenance of complete installations and systems via company networks or the web are now possible. The harsh industrial environment at
device level requires ‘Industrial Ethernet’ system components to be robust - requiring IP65/IP67 protection. Especially important is the high quality of the plug connections as these have to operate reliably against shock, vibration, humidity, EMC problems, temperature fluctuations and at times aggressive media. D-coded M12 connectors, according to the DIN EN 61076-2-101 standard, meet these requirements easily. With 100 mating cycles, IP65/ IP67 and a shock resistance of 50g it became a standard in ‘Industrial Ethernet’. Using Murrelektronik’s prewired and molded M12 connectors prevents wiring errors and is tamper-proof. The d-coded pin design reliably prevents mistakes caused by wrong connections. If the data quantity is higher, X- coded M12 connectors according to E DIN EN 61076-2-109 are the right choice. Four separately shielded data pairs that are separated by an X shaped metal cross, guarantee proper data transfer up to 10Gbit (ISO/IEC 11801 Cat. 6A). With the Y-coded M12 round plug
and fieldbus systems provided advantages in their applications. However, they were not sufficiently compatible. For a long time, this has prevented a standard communication structure from the office level to the field level. Therefore, transferring the Ethernet standards from the office level into the world of automation (Industrial Ethernet) was a significant step. High data transfer rates of 100Mbit/s
(CAT 5 ISO/IEC 11801 Class D) and a transfer method with no collisions makes ‘Fast Ethernet’ real time capable. Management, control and field level are communicating without any perceivable delay, which allows many diverse and
connector, Murrelektronik offers another variant for ‘Industrial Ethernet’ applications. This hybrid solution makes it possible to transfer power and signal together in a single connector. The metal Y- coding separates the four power contacts from the four signal contacts in the pin design. This makes it possible to transfer 100Mbit/s while at the same time providing 2 x 6A power connections.
MATERIAL For ‘Industrial Ethernet’, selecting a suitable cable material is as important as choosing the right connector. For each application, a specially designed cable is
/AUTOMATION
Right: Y-coded connectors transfer power and signal in one cable
Left: Murrelektronik offers cable for every application
Below: no matter which bus protocol, Murrelektronik offers the appropriate connector
available. If the wrong cable type is used, cable failure (for example wire break) can occur in a very short time and the complete installation may fail. For static applications, Murrelektronik recommend type A cables with a PVC jacket. For flexible applications, type B cables with a PUR jacket is the right choice with an especially good price/performance ratio. For dynamic applications, where cables are exposed to constant torsion or continuously moving drag chains, a highly flexible type C PUR cable is required. Additionally, it has to be taken into account that an Ethernet cable that is suitable for C-track applications is not a torsion cable and a torsion Ethernet cable is not suitable for drag chains. It is also very important to pay attention to the minimum bend radius, because using a small radius will destroy the cable.
THE COMPLETE SOLUTION Murrelektronik offers a wide product range for ‘Industrial Ethernet’ as a standard program that is complemented by customised versions. Appropriate interface modules such as flange connectors or cable entry
systems, and the corresponding bus cables, are sold by the metre from 100m to 500m - all cables are UL approved. All these cables are suitable for Fast Connect and can easily be pre-wired with the Fast Connect tool.
Murrelektronik
www.murrelektronik.co.uk T: 0161 728 3133
Enter 231 PLCS & INDUSTRIAL PCS | NOVEMBER 2014 S17
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