Comtrol Modbus TCP User Guide - Manual (Page 9)

DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I Chapter 1. Introduction - 9
Enhanced Modbus/TCP System Architecture (Firmware 3.x)
1.4.2. Enhanced Modbus/TCP System Architecture (Firmware 3.x)
Using the Modbus/TCP firmware V3.x doubles the capacity of the DeviceMaster UP by providing a raw/ASCII
interface to both serial and Ethernet TCP/IP devices. At the same time, the DeviceMaster UP continues to
provide a traditional Modbus/TCP to Modbus/RTU interface for Modbus/RTU slave devices.
• Improved PLC interfaces:
- Transfer of large received serial device packets up to 1024 bytes in Master Receive mode.
- Transfer of large received Ethernet device packets up to 2048 bytes in Master Receive mode.
- Throttling of received data to the PLC in the Master Receive mode.
- Ensures data received by the PLC is not overwritten before it can be processed.
- Disabling of non-filtered receive queue, ensures the PLC will only receive the latest received serial/
Ethernet device data.
• New embedded web pages
- PLC Interface Diagnostics page provides statistics and error messages to monitor and help diagnose
PLC interface problems.
- Serial/Ethernet Device Communication Statistics page is a comprehensive statistics page for all serial
and Ethernet device interfaces. Includes packet, byte, and error counts to the PLC(s) and
application(s) as well as comprehensive filtering statistics.
- Ethernet Device Interface Configuration page provides a user interface to the Ethernet device
interface configuration.
For example:
• The DeviceMaster UP 1-port provides Modbus/TCP support for one raw/ASCII or Modbus/RTU serial
device and one raw/ASCII Ethernet device for a total of two devices.
• The DeviceMaster UP 2-port provides Modbus/TCP support for two raw/ASCII or Modbus/RTU serial
device and two raw/ASCII Ethernet device for a total of four devices.
• The DeviceMaster UP 4-port provides Modbus/TCP support for four raw/ASCII or Modbus/RTU serial
devices and four raw/ASCII Ethernet devices for a total of eight devices.
Modbus/TCP firmware 3.x provides an application interface for both serial and Ethernet raw/ASCII devices.
You can connect any application, such as a configuration, database, or control application, via the application
socket port to raw/ASCII serial and/or Ethernet devices while the device(s) are attached to the PLC via
Modbus/TCP.