Rs485 Interface - Siemens G120P Manual

3.7.1
Siemens AG
1. Select the macro (MacPar) 108 (USS fieldbus), 109 (Modbus), 110 (BACnet),
114 (P1 fieldbus) in the last stage of basic commissioning.
2. If the basic commissioning has already been performed, change the value
manually, for example:
P0010 = 1 (parameter filter quick commissioning)
P0015 = 108 (macro 108)
P0010 = 0 (parameter filter ready)
3. If the communication function is only to monitor the drive, but not to control it,
proceed as follows:
- Basic commissioning with macro 108, 109 or 110.
- P0010 = 1 (parameter filter quick commissioning)
P0015 = 12 (macro 12, control via digital input and analog setpoint)
P0010 = 0 (parameter filter ready)
The "Unit switchover" function is not permissible with this bus system.

RS485 interface

Integration into Desigo
See Engineering Manual TX G120P (document ID: CM110576xx_01).
Interfacing to a network
1. Connect the 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).
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 Structure of the Control Unit [➙ 8].
Setting the address
1. Set the drive's fieldbus address either using the DIP switch on the Control Unit
or via parameter p2021.
2. The positions and settings of the DIP switches are described in Structure of the
Control Unit [➙ 8].
 If you have specified a valid address using DIP switches, this address will
always be the one that takes effect, and p2021 cannot be changed.
 If you set all DIP switches to "OFF" (0), then p2021 defines the address.
Commissioning
3
Communication
31
CM2G5111en
2014-05-16