Emerson 20/20 service manual Auxiliary Input / Output, Digital Inputs

Section 18 • Auxiliary Input / Output

Overview

The Auxiliary Input/Output (I/O) section of the Vission 20/20 gives the operator flexibility to add peripheral instruments and/or devices such as motors, valves and solenoids. With these additions, customer configurable I/Os are useful in expanding the functions of the Vission 20/20 where it was not explicitly designed to control, see Figure 18-1. Auxiliary Input/Output Screen.

Setting up one or more of the auxiliary inputs or out- puts start with the configuration screen. In order to en- able the auxiliary I/O, the Vission 20/20 must first be equipped with one of the available expandable I/O cards and the card must be selected on page 6 of the configu- ration screen. Once the appropriate card is available, then the operator will be permitted to enable and name the desired auxiliary I/O. The operator can then navigate to the Auxiliary I/O screen where the operator can define

how that I/O will operate.

Digital Inputs:

The Digital Inputs section of the auxiliary I/O allows an operator to configure the auxiliary digital inputs. The digital input can be configured to produce an alarm, a trip, and an inhibit on either a high or low input. A low input is 0vac and a high is 120vac on the enabled input. Leaving all options in their default setting will mean no action will be taken on an enable input. The input will simply be available for viewing at the panel or by communications.

Trip/Alarm Check:

•Selecting this checkbox enables the alarms and/or trip functions of the Vission 20/20 for the desired digital input. The accompanying drop-down box gives the operator the flexibility to choose whether the alarm and/or tip occurs if the input is high or low.

Figure 18-1. Auxiliary Input/Output Screen

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153 18 – 1