Siemens G120P Technical Manual page 56

Variable speed drive
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Commissioning
6
Configuring communication
Interfacing to a network
Setting the address
56 | 98
Siemens
Building Technologies
The "Unit switchover" function is not permissible with this system.
RS485 interface
For information about integration in Desigo, see Engineering Manual TX G120P
(document ID: CM110576xx_01).
1. Connect the variable speed drive to your fieldbus via the RS485 interface. This
connector has short-circuit proof, isolated pins.
2. Connect the bus terminating resistor for the first and last stations.
When the bus is operating, the first and last bus station must be continuously
connected to the supply. The maximum cable length is 1200 m (3300 ft).
NOTICE
Supply the Control Unit with 24 V DC via terminals 31 and 32 to enable
communication to continue to take place with the controller when the line voltage
is switched off.
See also Chapter CU230P-2-BT Control Unit [➙ 21].
1. Set the variable speed drive's fieldbus address either using the DIP switch on
the Control Unit or via parameter p2021.
2. Please refer to Chapter CU230P-2-BT Control Unit [➙ 21] for the position and
setting of the DIP switch. If you have set a valid address using the DIP switch,
this address always remains valid and p2021 cannot be changed.
 If you set all DIP switches to "OFF" (0), then p2021 defines the address.
A bus address, baud rate or protocol selection that has been changed only
becomes effective once the variable speed drive has been switched off and back
on again.
Restart the variable speed drive after changing the bus address.
A5E36496664A_d
2016-03-17

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