Using the USB Port

Use the USB port as follows:

• to connect the processor to Control Expert using the following connection settings:

  • Communication Selection: USB; Address: SYS, or

  • Communication Selection: TCP/IP; Address: 90.0.0.1

• to perform processor firmware upgrades, using the USB communication selection

• to access processor web pages at IP address 90.0.0.1

The USB port provides an electrically isolated interface, and serves as the default port for connecting a PC to the 171 CBU 78090, 171 CBU 98090 and 171 CBU 98091 processor. When you connect a PC to the processor USB port, the processor becomes a USB peripheral device and the PC acts as the USB host.

For communications between the PC and processor over the USB port:

• 90.0.0.1 is the fixed IP address of the processor.

• 90.0.0.2 is the IP address of the PC.

Use Control Expert to perform:

• on-line application programming

• application debug

• the on-line commands: RUN, STOP, READ, and WRITE

Use Automation Device Maintenance or Unity Loader to perform:

• application download

• application upload

• firmware upgrade

Although you can connect your PC to only one processor at a time over the USB port, you can create multiple connections between a processor and programs running on your PC. For example, you can use the USB port to connect simultaneously both an HMI application and Control Expert to the processor.

USB Port Features

The USB port includes the following features: