When you create an M90 network, you must assign a Unit ID number to each controller. A Unit ID number is unique. It must be used only once within a network.

You use this number for two purposes:

• To enable the M90 controllers to exchange data.
• To access a networked M90 via your PC.

To set a Unit ID number:

1. Click Controller on the Standard menu bar.

2. Select OPLC Settings from the Controller menu.

3. The OPLC Settings window opens.

4. Enter the new ID number in the Unit ID window.

5. Click << Set to enter the new IN number.

Displaying the Unit ID Tool Bar

1. Display the Unit ID by selecting ID from the Controller menu.
2. The Unit ID tool bar opens as shown below.

To download via an M90 bridge to a networked M90, you must select the unique ID of the networked M90. When you enter '0' as the Unit ID number, you communicate directly with the M90 that you are using as a bridge to the network.