Siemens SINAMICS V20 Operating Instructions Manual page 178

Communicating with the PLC
7.2 MODBUS communication
BICO parameters
The updating of BICO parameters will also be done in the parameter processing in the
background. Because of the limitations of the register value, it is only possible to write a '0'
or a '1' to a BICO parameter. This will set BICO input to a static value of either '0' or '1'. The
previous connection to another parameter is lost. Reading the BICO parameter will return the
current value of the BICO output.
For example: MODBUS register number 40200. Writing a value 0 or 1 to that register will set
the BICO input P0731 statically to that value. Reading will return the BICO output, which is
stored in r0747.0.
Fault
The inverter displays the fault F72 when the following three conditions are met:
● The parameter P2014 (USS/MODBUS telegram off time) is not equal to 0.
● Process data has been received from the master since the inverter's start-up.
● The time between receipts of two consecutive process data telegrams exceeds the value
of P2014.
178
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006