Serial interfaces
55
IRDH275BM-7_D00123_06_M_XXEN/07.2018
The following table gives an overview about essential alarm messages and
the assignment of the messages indicated on the display or operator panels,
e.g. PRC1470.
The BMS function is completely available in the standby mode
(Stand-by: F1/F2).
6.3.3 Commissioning of an RS-485 network with BMS protocol
Connect the terminals A and B of all bus nodes in one line
Switch the terminating resistors on at the beginning and end of the RS-
485 network or in case of devices without a terminating switch, at the
end of the bus, connect a 120 Ω resistor to the terminals A and B.
Switch the supply voltage U
S
on.
Determine one IRDH275B as the Master and assign address 1.
Assign the addresses (2…30) subsequently to all other IRDH275B
devices and other bus nodes (see table below).
Check whether a flashing point appears on all devices
(BMS commands are being received).
Message Channel Meaning
Insulation
Fault
1 Insulation resistance < setting Alarm 1
Insulation
Fault
2 Insulation resistance < setting Alarm 2
Connection PE 4
Connection error /KE against PE
conductor
Device error 5 Internal device error
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