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How to

How to


Products: AO-8, AO-V-8, AS-P-3, AS-B, DI-16, DO-FA-12, DO-FC-8, AS-P, Virtual Project Servers, RTD-DI-16, UI-16, UI-16 v2, UI-8/AO-4, UI-8/AO-4 v2, UI-8/AO-V-4, UI-8/AO-V-4 v2, UI-8/DO-FC-4, UI-8/DO-FC-4 v2
Functionalities: Central IO , Hardware
Product version: 7.0, 7.1
6/25/2026

Printing a Wiring List for the I/O Bus

You print an I/O wiring list for the I/O bus that describes which I/O points are associated with each I/O module. You use the printed copy of this list to help wire the I/O bus network.

Important:

If a Module ID is Null, you cannot print the wiring list. If a channel is Null, the I/O point labels do not display in the wiring list.

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The I/O bus consists of the following parts:

  • Power bus

  • Address bus

  • Communication bus

All the buses use a common ground, which is connected to the signal return paths with terminals called "RET". The signal return path is also called signal ground.

The power bus distributes 24 VDC power from the power supply to the Automation Server and I/O modules.

The address bus is based on a position-dependent addressing scheme. The address bus passes the address (position) of a terminal base to the next terminal base on the I/O bus. Position 1 is on the left side of the I/O bus. The address is incremented by 1, up to 32, for each subsequent terminal base on the bus. When an I/O module is installed on the terminal base, Building Operation associates the I/O module with the position of the terminal base.

The communication bus enables serial (RS-485) communication between the Automation Server and the I/O modules. The Automation Server controls and supervises the communication on the communication bus. The I/O modules also monitor their communication status. When a new I/O module is configured and connected to the I/O bus, the Automation Server automatically detects the new device.

 
action_zoom_plus_stroke I/O bus elements
Figure: I/O bus elements

You specify the I/O module type and name when you create the logical I/O module in Building Operation WorkStation. Initially, the module ID is Null, which means that the I/O module is non-operational. You assign the module ID to a position (physical slot) on the I/O bus. You can configure the module ID either when you create the logical I/O module or later.

When an I/O module is plugged into the system, Building Operation associates the I/O module with the logical I/O module that has the same position or module ID. After an I/O module loses communication with the Automation Server for 255 seconds, any configured outputs on the I/O module produce the default output value. The I/O module's status LED will also flash red (100 ms ON, 100 ms OFF) and the point or channel's output changes to a user-defined state.

To print a wiring list for the I/O bus

  1. In WorkStation, in the System Tree pane, click the IO Bus on an automation server.

  2. On the Actions menu, click Print IO wiring list.

  3. In the Print IO Wiring List dialog box, click the Printer icon

     
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    .

  4. To print a wiring list for a single I/O module, right-click the selected I/O module.

  5. Click Print IO wiringlist.

  6. Click the Printer icon

     
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    .

Observe that the complete path to the I/O module is displayed on the title bar for the I/O wiring list.

See Also

  • I/O Bus Elements
  • I/O Bus Limits
  • I/O Modules in the Work Area