Analog Output Setup

The 9220 controller has two analog outputs. The outputs can be configured for 0 – 20 milliamp signal or a 4 – 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 just below the main menu list.  Clicking on this value will display an input box, and then you can use the pull-down menu to select the desired parameter. Once selected click OK and the displayed assignment under Value will be the current assignment type. The following is a list of the options:

 

PV 1 retrans        

Loop 1 inc     

Loop 1 dec       

Loop 1 combo 

PV 2 retrans     

Loop 2 inc    

Loop 2 dec       

Loop 2 combo

PV3 retrans        

Loop 3 inc        

Loop 3 dec        

Loop 3 combo        

Input 1 retrans        

Input 2 retrans     

Input 3 retrans 

SP1 retrans

SP2 retrans

SP3 retrans

Programmer ID num

PV switch loop inc

PV switch loop dec    

PV switch loop combo    

Gauge 1 log of torr    

Gauge 1 linear torr    

Gauge 1 microns   

Gauge 2 linear torr  

Gauge 2 log of torr   

Gauge 2 microns 

Gauge 3 linear torr 

Gauge 3 log of torr    

Gauge 3 microns 

Gauge 4 linear torr

Gauge 4 log of torr

Gauge 4 microns

Programmer Analog Out 1    

Programmer Analog Out 2

Programmer Analog Out 3    

Programmer Analog Out 4    

Programmer Analog Out 5    

Programmer Analog Out 6

Disabled

 

NOTE: The ‘Disabled’ setting allows the external device to write directly to the output register of the 9220’s internal Digital Analog Converter.

 

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.  Normally, when scaling a control output, this would be the low range and is set up for 0. This value can vary depending on the scaling needs. 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.  Normally, when scaling a control output, this would be the low range and is set up for 100. This value can vary depending on the scaling needs. Clicking on this value will display an input box from which the user can select a new value.  The range is –32768 to 32767.

 

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