Moxa IO device through Modbus

TERRA 4D comes with a Modbus plugin which allows integration of different types of Modbus devices. Here we focus on Moxa devices.

• Switch outputs on/off
• Get events when an input is triggerd
• Show status of inputs and outputs

• Connect the Moxa device to Ethernet and open the browser
• Connect to address 192.168.127.254 which is normally the default IP address of the Moxa devices
• Main things to configure: Password, Security/Service Setting/Modbus!!!, Network/LAN, IO/Channel Mode (especially for DIOs)
• alternatively you can use IOxpress software

• Connect the Moxa device to Ethernet and install the Moxa IOxpress software (download from Moxa website)
• Start the Moxa IOxpress and select Device/Search to find your device
• Main things to configure: Password, Security/Service Setting/Modbus!!!, Network/LAN, IO/Channel Mode (especially for DIOs)
• on the Device Library page you find in the Deployment combobox the device actions, like up- and download of configuration files
• on the Configuration Library page you can change all settings and store it to a local file

• create a subsystem plugin device Modbus with default settings
• Input:
  • create a IO device of type Modbus and select SubType “Input”
  • IP port: 502, Server address: 0, Start address: 0, Input number: 0…N
• Output:
  • create a IO device of type Modbus and select SubType “Output”
  • IP port: 502, Server address: 0, Start address: 0, Output number: 0…N
• Input register (e.g. for PWM counter):
  • create a IO device of type Modbus and select SubType “Input register”
  • IP port: 502, Server address: 0, Start address: 17, Input number: 0…N
• Analog Input:
  • create a IO device of type Modbus and select SubType “Analog Input”
  • IP port: 502, Server address: 0, Start address: 520, Input number: 0…N
  • Configure low/high threshold depending on application to generate events when reading goes outside the expected range.

• Within the device web page, in the main menu, within User-Defined Modbus Addressing, select Analog Inputs, Digital Input/Outputs (or similar):
  • Make sure “Enable Modbus/TCP Slave Protocol” is enabled
  • Within the table all the addresses of the available data points are listed. E.g. “AI Scaling Value (Float)” at “0520” as Input Register (read-only), Reference Address “30521”
  • Within Terra4D use “Analog Input” with the address 520 (the 30000 is automatically added by selecting Analog Input).

* CAS Modbus Scanner Tool to read/check Modbus device and see the values returned by the device.