Super Systems 9120 with TS - Manual (Page 26)

SSi 9120 Touchscreen Interface
4586 – 9120 With Touch Screen Interface Page 26 of 80
PV 1 retrans Input 1 retrans
Loop 1 inc Input 2 retrans
Loop 1 dec Input 3 retrans
Loop 1 combo Not Used
PV 2 retrans O2 offset log
Loop 2 inc SP1 retrans
Loop 2 dec SP2 retrans
Loop 2 combo SP3 retrans
PV3 retrans Programmer ID number
Loop 3 inc
Loop 3 dec
Loop 3 combo
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 –
32767 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 –32767 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.
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)
Range = 400
Example: if 4 – 20 mA = 800 mV - 1200 mV and PV is O2
Offset = 800 (starting point)
Range = 4000 (400.0)
Example: if 4 – 20 mA = 800 mV - 1200 mV and PV is % Carbon