User`s manual

170 BNO 671 00 / 170 BNO 671 01
60
Electrical Functions of Branch interface module 170 BNO 671 00 / 01
Supply The supply voltage is UB = 24 VDC.
The logical supply (VCC = 5 VDC) is created from the 24 VDC. It is monitored. If the
voltage is in the tolerance range, a green LED will be switched on (ready). If the
voltage falls outside tolerance, a reset will be triggered.
Interfaces The Branch interface module has an INTERBUS interface whose signals, inclusive
of GND, are sent outwards using three 9 pin. DSUB plugs (for incoming and
outgoing remote bus and remote bus branches). These signals are series
connected to RS 485 drivers.
These interfaces are suitable for the use of OPTOSUB. Up to two OPTOSUBs can
operate with the branch interface module.
The incoming remote bus signals are galvanically isolated from the other logic using
optocouplers. The outgoing remote bus and remote bus branch signals have a
potential connection. The branch interface module uses a special signal to test
whether it is the last node at the remote bus.
Peripheral
Signals
The terminals of the terminal block include a reconfiguration button, with which the
remote bus branch can be reconnected. A relay output is also available, which can
indicate an error at the remote bus branch.
The relay contacts are change over contacts.