Modbus Mapping configuration page

Modbus Mapping allows communication between a
Micro800
 controller and Modbus devices, such as the PanelView Component (PVC) DesignStation. Modbus mapping supports up to 200 variables and is available for the following controllers:
  • L20E
  • L50E
  • L70E
Use the
Modbus Mapping
 configuration page to:
  • Associate a Modbus address value to a value in the
    Micro800
     controller.
  • Delete a Modbus address association.
  • Export Modbus mappings.
  • Import Modbus mappings.
The Modbus addressing format is device-specific. Although it can be documented in multiple ways for user understanding, the transmitted bytes through the wire remain identical. In the following examples, a
Micro800
 controller serves as a slave, and the logical address of the first Coil is 000001.
  • PVC example
    The same format is used when configuring the Modbus address in the PVC DesignStation and
    FactoryTalk Design Workbench
    . Specifically, the first Coil is assigned the address 000001 in the PVC DesignStation and
    FactoryTalk Design Workbench
    . When you enter the same Modbus address, it links a tag in the PVC DesignStation with a variable in
    FactoryTalk Design Workbench
    .
  • Example of other devices
    For some devices, the Modbus address range format does not align with the format in
    FactoryTalk Design Workbench
     Modbus mapping. A common format is for the master to represent the Modbus address, which is the physical address transmitted over the wire, with the Modbus address 000000 assigned to the first Coil. In such cases, the master's address of 000000 for the first Coil must be mapped to 000001 in
    FactoryTalk Design Workbench
     Modbus mapping.
Settings on the Modbus Mapping configuration page
Setting
Description
Ethernet
Provides a link to the controller's
Ethernet
 configuration page, where you can turn on the Modbus Transmission Control Protocol (TCP).
Variable Name
Specifies the variable name that is associated with the current Modbus address.
Modbus mapping supports up to 200 variables.
Data Type
Specifies the Modbus data types that are available for configuration.
Address
Specifies the Modbus address that you will enter. An address contains 5 or 6 numbers, with the first number representing the register type.
  • 0xxxxx
     for coils
  • 1xxxxx
     for discrete inputs
  • 3xxxxx
     for input registers
  • 4xxxxx
     for holding registers
Address Used
Specifies the range of Modbus addresses that can be associated with a variable. The values vary with the Modbus address and data type.
6-digit address ranges are as follows:
  • 000001–065536
  • 100001–165536
  • 300001–365536
  • 400001–465536
5-digit address ranges are as follows:
  • 00001–09999
  • 10001–19999
  • 30001–39999
  • 40001–49999
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