Channel Redundancy - Procentec ProfiHub B2FOR+ User Manual

2.14 Channel Redundancy

To use the Redundancy option of the B2FOR+ / B4FOR+, set the rotary switch to 2 or 5.
This enables the last two copper channels to be one redundant path to any other ProfiHub, to a redundant
ComBricks, or to any other supporting product. See Fig. 16 for an example.
ProfiHub B4+FO2
COMbricks
Fig. 16 - Redundant path between multiple 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 B2FOR+ / B4FOR+ in Redundancy mode causes a delay in processing the telegrams. 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. Generally a MinTSDR of 25 is sufficient.
ProfiHub B2FOR+ / B4FOR+ User Manual | August 2019 | © PROCENTEC 24/60