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Rockwell Automation Publication 520-UM001K-EN-E - August 2021
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Appendix C RS485 (DSI) Protocol
Parameter Configuration
The following PowerFlex 520-series drive parameters are used to configure the
drive to operate on a DSI network.
Supported Modbus Function
Codes
The Drive Serial Interface (DSI) used on PowerFlex 520-series drives supports
some of the Modbus function codes.
Writing (06) Logic
Command Data
The PowerFlex 520-series drive can be controlled through the network by
sending Function Code 06 writes to register address 2000H (Logic Command).
[Start Source 1] must be set to 3 “Serial/DSI” in order to accept the
commands. PowerFlex 523 drives support only Velocity bit definitions.
PowerFlex 525 drives can use Parameter
[Cmd Stat Select] to select either
Velocity or Position bit definitions.
Configuring Parameters for DSI Network
Parameter
Details
Reference
[Start Source 1]
Set to 3 “Serial/DSI”
if Start is controlled from the network.
[Speed Reference1] Set to 3 “Serial/DSI” if the Speed Reference is controlled from the
network.
[RS485 Data Rate]
Sets the data rate for the RS485 (DSI) Port. All nodes on the network must
be set to the same data rate.
[RS485 Node Addr] Sets the node address for the drive on the network. Each device on the
network requires a unique node address.
[Comm Loss Action] Selects the drive’s response to communication problems.
[Comm Loss Time] Sets the time that the drive will remain in communication loss before the
drive implements
[Comm Loss Action].
[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.
[Comm Write Mode] Set to 0 “Save” when programming drive.
Set to 1 “RAM only” to only write to volatile memory.
Supported Modbus Function Codes
Modbus Function Code (Decimal)
Command
03
Read Holding Registers
06
Preset (Write) Single Register
16 (10 Hexadecimal)
Preset (Write) Multiple Registers
IMPORTANT
Modbus 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 (for example, ProSoft
3150-MCM SLC™ Modbus scanner) and 8193 for others (for example,
PanelView™).
Powerup/Reset the drive after selecting an option for C122 [Cmd Stat
Select] for the change to take effect.
Summary of Contents for Allen-Bradley PowerFlex 520 Series
Page 8: ...8 Rockwell Automation Publication 520 UM001K EN E August 2021 Table of Contents Notes ...
Page 68: ...68 Rockwell Automation Publication 520 UM001K EN E August 2021 Chapter 2 Start Up Notes ...
Page 236: ...236 Rockwell Automation Publication 520 UM001K EN E August 2021 Appendix F PID Set Up Notes ...
Page 270: ...270 Rockwell Automation Publication 520 UM001K EN E August 2021 Index Notes ...