Super Systems 9120 - Manual (Page 33)

4574 - SSi 9120 Manual Rev A Page 33 Super Systems Inc
two 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 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
Input 1 retrans
Loop 1 inc Input 2 retrans
Loop 1 dec Input 3 retrans
Loop 1 combo PV1 retrans w/ expo range
PV 2 retrans O2 offset log
Loop 2 inc SP1 retrans
Loop 2 dec SP2 retrans
Loop 2 combo DP retrans
Disassociation
Nit_Pot
Hydrogen
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 is % Carbon, then the
range will need to include the two decimal points for % Carbon. So, a range of 80 will be entered as 8000
. See below
for more examples.
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 and PV is Temperature
Offset = 800 (starting point)