Procentec ProfiHub B5 Plus - Channel Redundancy

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ProfiHub B5+ / B5+RD User Manual

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Version 2.0 – July 2014 Page 22 / 56

2.11 Channel Redundancy

To use the Redundancy option of the B5+, set the rotary switch to the ‘C’ position.

This enables the last two channels (4 and 5) to be one redundant path to another B5+, to a redundant

COMbricks, or to any other supporting product. See Fig. 17 for an example.

Fig. 17 - Redundant path between two ProfiHubs

The telegrams are transferred onto both redundant channels. The logic inside the ProfiHub determines

which telegram is used to be transferred onto the other channels. A message received by a redundant

channel is repeated on all other channels, except the other redundant channel. A message received

by a normal channel is repeated on all other channels.

When one redundant cable breaks, the other cable ensures safe delivery of the telegram. In this event

the built-in alarm contact will close. The red ‘ERROR’ LED will blink with an interval of 100ms. When

the redundant path is fixed, press the ‘ALARM RESET’ pushbutton to reset the alarm.

ATTENTION:

Using the ProfiHub B5+ in Redundancy mode causes a delay in processing the telegrams. When used

together with COMbricks in redundancy mode it is required to increase the default MinTSDR in the

PLC busparameters slightly. Recommended is to increase the MinTSDR with a value according to the

Delay Time table, column ‘Robust Mode’, described in the Technical Data chapter.