Emerson E2 operation manual Setting Up Analog Outputs, Digital Output Screen

Figure 9-12- Digital Output Screen

Board/Point # The Board/Point Number will auto- matically be defined if you are configuring the point from the Output Status screen, and indicates the physical address of the board.

Point Name The Point Name is simply a name for the output point that may be used as a reference.

Assigning a descriptive name to a point makes set- ting up outputs for applications much easier. For example, if you are setting up condenser fan #3 for condenser #2, you may choose to name it “CND #2 FAN #3”. Then, when programming your Condenser Control application, you may easily define the fan output by tying it to CND #2 FAN #3. This keeps you from having to keep track of which contacts are tied to which point numbers.

You are required to enter a point name in the Point Name field. The default name is “:{BOARD NAME}:{UNIT NUMBER}:{BOARD NUM- BER}:{POINT NUMBER}”.

Select Eng. Units The Select Eng. Units field is where you may select how the ON and OFF states of this point are displayed and represented in the E2’s setup fields and status screens. By default, digital outputs have ON-OFF engineering units, meaning when the output is ON or OFF, the input will be rep- resented as “ON” or “OFF” in the system software.

Engineering units are only a visual representation of the state of the output point (energized or de-ener- gized). Therefore, it is not necessary to define engi- neering units for digital inputs. However, selecting units that are appropriate to the output’s function (such as BYP or NO_BYP for inputs that initiate bypasses) will make the output’s state easier to read and understand.

To choose an engineering unit, press  (LOOK UP) to select.

Default Value The value that the relay output should go to if the output is not associated to an application. The default value of the Default Value field is OFF.

Physical On Specifies whether the physical relay output should energize or de-energize its coil when the logical output is on.

Physical Off Specifies whether the physical relay output should energize or de-energize its coil when the logical output is off.

Physical Null Specifies whether the physical relay output should energize or de-energize its coil when there is no application associated with the output.

Minimum Physical On Time Specifies the mini- mum time the physical output must remain on regardless of the logical output state.

Minimum Physical Off Time Specifies the mini- mum time the physical output must remain off regardless of the logical output state.

PRIORITY OVR When an input is overridden to an output cell. If this input is not set to NONE, it will be used for the output value instead of the input value, but only for the override timeout period.

Priority Override Timeout When an input goes on it will override to a value for the timeout period.

INPUT This field links the output to an application. You do not need to enter anything in this field. You will be able to link applications to this point during the application setup process.

9.2.7.4Setting Up Analog Outputs

Open the Analog Output screen by selecting an Analog (A) output from the Output Status screen Figure 9-10and pressing  (SETUP).

This is where output types, units, and default values are specified for analog output points.

In most cases, only the point name will need defining in this screen, unless you wish to change the 0-10V output range or configure a priority override.

9-14 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013