Communication Via P1 - Siemens SINAMICS G120 Original Instructions Manual

7.6.5

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
parameter p2021 or in STARTER.
Valid address range:
If you have specified a valid address using the
address switches, this address will always be the one
that takes effect, and parameter p2021 (factory
setting: 99) will not be able to be changed.
The positions of the address switches are described
in Section: Interfaces, connectors, switches, control
terminals, LEDs on the CU (Page 60).
Procedure
To change the bus address, proceed as follows:
1. Set the new address:
2. Switch on the inverter power supply and, if available, the 24 V power supply for the
3. Switch on the voltages again after all LEDs at the inverter have gone dark.
You have so changed the bus address.
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
1 ... 99
– using the address switches
– from an operator panel in parameter p2021
– in STARTER using screen form "Control Unit/Communication/Fieldbus", or using the
expert list in parameter p2021
Control Unit.
Configuring the fieldbus
7.6 Communication via RS485
183