Analog Output Setup

The 9220 controller has the option of six analog outputs. The outputs are ranged for a 4 – 20 milliamp signal or a 0 – 20 milliamp signal. Each output comes with a factory default configuration dependent on the application. Each output can be modified prior to shipment to your facility or in the field by a supervisor.

 

Analog Output Terminals

Analog output 1 – terminals 24 and 25

Analog output 2 – terminals 25 and 26

 

Assignment

The analog output assignment can be modified depending on your system requirements. To change the Assignment first select which analog output you want to change by selecting it in the pull-down menu at the top of the screen.  The following is a list of the options:

 

 

PV 1 retrans        Loop 1 inc        Loop 2 dec        Loop 1 combo        

PV 2 retrans        Loop 2 inc        Loop 2 dec        Loop 2 combo    

PV 3 retrans        Loop 3 inc        Loop 3 dec        Loop 3 combo    

Input 1 retrans        Input 2 retrans        Input 3 retrans        G1 log of torr    

G1 linear torr        G1 microns        G2 log of torr        G2 linear torr    

G2 microns        G3 log of torr        G3 linear torr        G3 microns    

G4 log of torr        G4 linear torr        G4 microns        Programmer ID number

Setpoint 1 retrans    Setpoint 2 retrans    Setpoint 3 retrans    PV SW loop inc

PV SW loop dec        PV SW loop combo    Programmer Analog out 1-6    

 

 

Combo example for carbon –     4 – 12 mA Air

                           12 – 20 mA Gas

 

Offset

This is the starting point, the Process Variable value at which you get 4 milliamps.  Clicking on this value will display an input box from which the user can select a new value.  The range is –32768 to 32767.

 

Range

This is a Process Variable value between 4 and 20 milliamps.  Clicking on this value will display an input box from which the user can select a new value.  The range is –32768 to 32767.

Note - The range, although not displayed with a decimal point, contains a decimal point that is dependent on the process variable selected. For example, if the offset is 20 mV for 4 mA, and you want 100 mV to be 20 mA, then your range should be 80. If the process variable is temperature, then the range will be 80, since temperature PVs do not have a decimal. If the PV were % Carbon, then the range will need to include the two decimal points for % Carbon. So, a range of 80 will be entered as 8000.

 

Current Selection 

Provides the option of 4-20 mA or 0-20 mA control.  Clicking on this value will display an input box with a drop-down list from which the user can select either of the two values listed above.

 

Offset and Range when assigned to a control loop

Inc : 0 = 4mA, 100 = 20mA

Dec : 0 = 4mA, -100 = 20mA

 

Example: if 4 – 20 mA = 800 mV  - 1200 mV

    Offset  = 800 (starting point)

    Range = 400

 

The Return button will return the user to the menu screen.