DOCA0036EN-14

Modbus TCP Access

The Com’X acts as both a Modbus TCP gateway and a Modbus device by using the internal Modbus TCP server.

Modbus TCP Gateway

NOTE: Modbus is not a secure protocol. Disable the Modbus ports for security purposes. If Modbus access is required, Schneider Electric strongly recommends using Modbus IP filtering feature for added security.
The Com’X acts as a Modbus gateway for wired or wireless Ethernet communications from an upstream PC to Ethernet devices and field instruments on the downstream network. This capability allows the user of local or cloud-based monitoring software to access information from devices for data collection, historical trending, analysis, and other functions.

Accessing the Internal Modbus Slave Device

The internal Modbus TCP server allows reading the digital input and analog input values of the Com’X via various Modbus registers . These registers can be read using Modbus slave ID 255.

After you configure the Com’X inputs in Device Settings, values are accessible through the gateway. The register values can also be viewed in the Measurements Table tab for measurements selected for logging.

The internal Modbus TCP server is active when Modbus TCP/IP communications is enabled in Firewall Management.

Companion Software Modbus TCP/IP Server Function

Downstream Modbus devices can be accessed from an upstream PC running a software application. Recommended software applications offered by Schneider Electric include:

  • Remote Setting Utility software for Masterpact and Compact NSX
  • EcoStruxure™ Power Monitoring Expert software.
** (see Modbus Register Mapping) (see Selecting Measurements to Log or Publish)Firewall Management
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