Integrating Inverters Into A Bus System Via The Rs485 Interface - Siemens SINAMICS G110M Function Manual

Communication via RS485

5.2 Integrating inverters into a bus system via the RS485 interface

5.2 Integrating inverters into a bus system via the RS485 interface
Connecting to a network via RS485
Connect the inverter to the fieldbus
via the RS485 interface.
The RS485 connector has short-
circuit proof, isolated pins.
You must switch-in the bus-
terminating resistor for the first and
last nodes.
You can find the position of the
RS485 connector and the bus termi-
nating resistor in the operating in-
structions for the inverter or the
Control Unit.
The precondition for error-free communications is that the first and last station are supplied
with power.
Communications are maintained if you withdraw individual slaves from the bus without
interrupting the cable (this is not possible for inverters with a high degree of protection).
Communication with the control, even when the line voltage is switched off
If, in your plant or system, communication with the control system should continue to function
even when the line voltage is switched off, then you must externally supply the
inverter/Control Unit with 24 V DC. To do this, use terminals 31 and 32 – or connector X01.
You can find additional details in the operating instructions for the inverter or the Control
Unit.
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Function Manual, 01/2016, FW V4.7 SP6, A5E34229197B AC
Fieldbuses