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77
PART 3 TC218
6. Parameters
Gain calibration value & Offset calibration value: (±
±±
±100mV input only)
(Gain: H8000 to H8007, Offset: H8008 to H800F)
For the ±100mV input, the gain and offset calibration is possible.
In the TC218, the A/D conversion data is calculated as follows.
When the gain calibration value is G and the offset calibration value is O, the conversion
calculation is performed in the TC218 as follows.
X
2
= (X
1
+ O) × G / 32000
X
1
: Initial A/D conversion value
X
2
: Gain/offset processed value
O: Offset calibration value (buffer memory address H8008 to H800F)
G: Gain calibration value (buffer memory address H8000 to H8007)
The data setting range of the gain and offset calibration value are as follows.
Input type Gain calibration value
Upper limit 32000
Default value 32000
±100mV
Lower limit 10000
Thermocouple Not applicable
Input type Offset calibration value
Upper limit 3200
Default value 0
±100mV
Lower limit -3200
Thermocouple Not applicable
Analog input
A/D
conversion
Offset
processing
Gain
processing
A/D conversion data
(read by T2 CPU)
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net