Banner DXMR90-X1 Series, Instruction Manual

Page: 8 / 55

May 09, 2023
DXMR90-X1 Series Controller Instruction Manual
8
Modbus® is a registered trademark of Schneider Electric USA, Inc. PROFINET® is a registered trademark of PROFIBUS
Nutzerorganisation e.V. EtherNet/IP™ is a trademark of ODVA, Inc. All other trademarks and registered trademarks cited are
the property of their respective owners.
Modbus Overview
The DXMR90-X1 Series Controller uses internal 32-bit registers to store information. The processor's internal Local Registers
serve as the main global pool of registers and are used as the common data exchange mechanism. External Modbus device
registers can be read into the Local Registers or written from the local data registers.
The DXMR90-X1 , as a Modbus master device or slave device, exchanges data using the Local Registers. Modbus over Eth-
ernet (Modbus/TCP) uses the Local Registers as the accessible register data.
Using Action, Read/Write, and Threshold Rules allows you to manipulate the processor's Local Registers. The MicroPython
or ScriptBasic programming capabilities extends the use of Local Registers with variables to create a flexible programming
solution for more complex applications.
The processor's Local Registers are divided into three different types: integer, floating point, and non-volatile. When using Lo-
cal Registers internally, the user can store 32-bit numbers. Using Local Registers with external Modbus devices follows the
Modbus standard of a 16-bit holding register. Local Registers are accessible as Modbus ID 199 when using ScriptBasic or
MicroPython.
DXMR90-X1 Modbus overview
Processor/Outputs (Base Board)
Ethernet
RS-485 (master)
RS-485 (slave)
Local Registers
(Modbus ID 199) Outputs (Modbus ID 203) Processor Controlled
Output (LEDs)
Local Registers
Integer
Local Registers
Float
Modbus Registers
The DXMR90-X1 Series Controller may have up to two internal Modbus slave addresses:
Internal Modbus slave IDs (factory default)
Modbus Slave ID Device
199 Local Registers—Internal storage registers
203 LED indicators
All Modbus registers are defined as 16-bit Modbus Holding Registers. The local register slave ID (199) is fixed for access via
ScriptBasic or MicroPython. When accessing the Local Registers through an external Modbus RTU Master, the Slave Port
(Port 0) slave ID can be changed using the DXM Configuration Software. Connected devices can use any Modbus Slave ID.
For a complete list of registers, see "Internal Local Registers (Slave ID 199)" on page 19 .
Modbus registers for internal local registers (Modbus slave ID 199)
Local Registers Type Description
1–845 32-bit integer Local data registers
846–849 32-bit integer Reset
851–900 32-bit non-volatile integer Data flash, non-volatile
901–1000 Reserved for internal use
1001–5000 Floating point Floating point registers, local data registers
Continued on page 9
© Banner Engineering Corp.