Emerson 20/20 service manual Analog Output Boards, Analog Output Board Layout

Section 3 • Hardware Architecture

Analog Output Boards

The Analog Output board convert signals form the Vission 20/20 program into a current ranging from 4mA to 20mA, see Figure 3-7. Analog Output Board Layout.

Voltage LEDs:

•Marked in the diagram below in Orange. These LEDs indicated the correct voltage of both the 5Vdc and 24Vdc power sources.

Communication LED’s:

•Marked in the diagram below in Green. These LEDs show the active communications between the digital output board and the Vission 20/20 CPU board.

Address Dipswitches:

•Marked in the diagram below in Red. These dipswitch- es are used to assign each board its address position. The addresses are binary and therefore the address of a digital output board will only be addressed as 10 (1010).

Figure 3-7. Analog Output Board Layout

3 – 14 Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153