RS485 (DSI) Protocol C-3
PowerFlex 4M Adjustable Frequency Drive FRN 1.xx - 2.xx User Manual
Publication 22F-UM001D-EN-E
Parameter Configuration
The following PowerFlex 4M parameters are used to configure the drive
to operate on a network.
Supported Modbus Function Codes
The peripheral interface (DSI) used on PowerFlex 4M drives supports
some of the Modbus function codes.
Important: Modb
us devices can be 0-based (registers are numbered
starting at 0) or 1-based (registers are numbered starting at
1). Depending on the Modbus Master used, the register
addresses listed on the following pages may need to be
offset by +1. For example, Logic Command may be register
address 8192 for some master devices (e.g. ProSoft
3150-MCM SLC Modbus scanner) and 8193 for others
(e.g. PanelViews).
Parameter Details Reference
P106 [Start Source] Set to 5 “RS485 (DSI) Port” if Start is controlled from
the network.
Page 3-9
P108 [Speed Reference] Set to 5 “RS485 (DSI) Port” if the Speed Reference is
controlled from the network.
Page 3-11
C302 [Comm Data Rate] Sets the data rate for the RS485 (DSI) Port. All nodes
on the network must be set to the same data rate.
Page 3-17
C303 [Comm Node Addr] Sets the node address for the drive on the network.
Each device on the network requires a unique node
address.
Page 3-17
C304 [Comm Loss Action]
Selects the drive’s response to communication problems.
Page 3-17
C305 [Comm Loss Time] Sets the time that the drive will remain in
communication loss before the drive implements A105
[Comm Loss Action].
Page
3-18
C306 [Comm Format] Sets the transmission mode, data bits, parity and stop
bits for the RS485 (DSI) Port. All nodes on the network
must be set to the same setting.
Page 3-18
Modbus Function Code (Decimal) Command
03 Read Holding Registers
06 Preset (Write) Single Register
16 (10 Hexadecimal) Preset (Write) Multiple Registers
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