Written by Mark Harries, Business Development Manager- I/O and Networks

Five top tips for fibre optic applications from Phoenix Contact

1.       Why choose fibre optic as a solution?

Fibre optic cables have the advantage of being able to transmit data over much longer ranges than copper cables. For example Ethernet cables are limited to a distance of 100m, whereas fibre cables can transmit data over distances of 45km.

As the above diagram illustrates, fibre optic cables do not suffer with data rate loss in relation to the cable length. This makes no difference in a fibre optic application.

2.       What about noise and EMI problems?

The below diagram shows that one of the major advantages of fibre optic cable is the total immunity against electromagnetic interferences (EMI). No data cable restrictions apply when laying fibre cable in tough environments for EMI. This is a major advantage in comparison to Ethernet cables.

3.       Choose the right connector.

The most common mistakes made in fibre optic applications are around choosing the correct connector. Polymer fibres allow for quick and easy connections to be made by the Engineer, with a cost effective tool set (2744131).

Glass fibres are suitable for very long distances, up to 45km with single mode cable. The disadvantage is that making the connections is not as easy in the field.

The table below gives you a useful overview of the connector types and the properties for the different cable types:

4. Choose the right cable

At Phoenix contact we can offer:

• Pre-made patch cables with your choice of connector 1, 2 or 5m long.
• Fibre cable to suit your application. For example we offer Drag chain/trailing cable, Profinet cable, heavy duty cable for outdoor use etc.
• Bespoke fibre cables, made to length with connectors of your choice.
• Tool kits for assembling your own fibre connections in a quick and cost-effective way.

The below table gives a useful overview for the different cable types and the properties they offer:

5.       Why choose Phoenix Contact Fibre Optic Converters?

Whether your requirement for fibre optic conversion is Profibus, ControlNet, DeviceNet, CANopen, Modbus, Interbus or Serial, the PSI-MOS range from Phoenix Contacts offers the following unique advantages:

• It is the only device on the market which permanently displays the Fibre Optic link quality. The link is tested without the need to transmit data. This is very useful when installing the cable, and connectors to check that the connection is good.

• PSI-MOS are zone 2 rated for ‘EX’ applications, and can connect to devices in zone 1 if required. The temperature rating of -20 to +60 degrees C  is also a standard feature for these devices.

• The modular T-Bus design, as show below, allows for a modular system that is hot-swappable, easily expandable and no cross-wiring is required. This reduces downtime and effort.

• Redundant power supplies from the ‘Mini’ range can also be connected to the T-Bus connector, along with copper repeaters as well. This offers a truly flexible solution.

• Flexible network structures such as point to point, line, tree, start and ring are all possible.

For further information, please contact Mark by telephone: 07717 335477 or email mharries@phoenixcontact.com.