Siemens SINAMICS G120P, Operating Instructions Manual

Page: 252 / 496

Operation
6.8 Communication via RS485
Inverter cabinet units
252
Operating Instructions, 12/2014, A5E32923362A
6.8.5 Communication via P1
P1 is an asynchronous master-slave communication between what is known as a Field
Cabinet (master) and the FLN devices (slaves). FLN stands for "Floor level network".
The master individually addresses the various slaves. A slave responds only if the master
addresses it. Communication between the slaves is not possible.
A Field Cabinet can have several FLN ports. You can connect up to 32 FLN devices to each
FLN port (slaves).
Settings in the controller
In the Field Cabinet, for each slave you must install what is known as a "Logical controller
(LCTR) point". In addition, in the Field Cabinet you must define the "Point numbers" for
communication.
An overview of the "Point Numbers" is provided on the following pages.
Setting the address
You set the bus address of the inverter using the
address switches on the Control Unit, using pa-
rameter p2021 or in STARTER.
Valid address range: 1 … 99
If you have specified a valid address using the
address switches, this address will always be the
one that takes effect, and parameter p2021 (facto-
ry setting: 99) will not be able to be changed.
The positions of the address switches are de-
scribed in Section: CU230P-2 HVAC Control Unit
(option K98) (Page 87).
Procedure
To change the bus address, proceed as follows:
1.
Set the address using one of the subsequently listed options:
–
Using the address switches
– With the IOP using p2021
– In STARTER using screen form "Control Unit/Communication/Fieldbus", or using the
expert list in parameter p2021.
2. Switch on the inverter power supply and, if available, the 24 V power supply for the
Control Unit.
3. Switch on the voltages again after all LEDs at the inverter have gone dark.