Calibration - Beckhoff ELX3312 Operating Manual

5.3.5 Limit 1 and Limit 2
Limit 1 and limit 2, index 0x80n0:13, index 0x80n0:14
A temperature range can be set that is limited by the values in the indices 0x80n0:13 [} 74] and 0x80n0:14
[} 74]. If the limit values are overshot, the bits in indices 0x60n0:03 and 0x60n0:05 are set.
The temperature value is entered with a resolution of 0.1°C.
Example
Limit 1= 30°C
Value index 0x80n0:13 [} 74] = 300
5.3.6

Calibration

Vendor calibration, index 0x80n0:0B
The vendor calibration is enabled via index 0x80n0:0B [} 74]. Parameterization takes place via the indices:
• 0x80nF:01 [} 75]: Vendor offset calibration thermocouple
• 0x80nF:02 [} 75]: Vendor gain calibration thermocouple
• 0x80nF:03 [} 75]: Vendor CJ offset calibration
Vendor and user calibration
User calibration (index 0x80n0:0A [} 74]) should only be performed instead of the vendor calibra-
tion (index 0x80n0:0B [} 74]), but this is generally only necessary in exceptional cases.
User scaling, index 0x80n0:01
The user scaling is enabled via index 0x80n0:01 [} 74]. Parameterization takes place via the indices
• 0x80n0:11 [} 74]: User scaling offset
The offset describes a vertical shift of the characteristic curve by a linear amount.
At a resolution of 0.1°, 1 digit
At a resolution of 0.01°, 1 digit
• 0x80n0:12 [} 74]: User scaling gain
The default value of 65536
The new gain value for 2-point user calibration after offset calibration is determined as follows:
Gain_new = reference temperature / measured value x 65536
User calibration, index 0x80n0:0A
User calibration is enabled via index 0x80n0:0A [} 74]. Parameterization takes place via the indices
• 0x80n0:17 [} 74]: User offset calibration thermocouple
• 0x80n0:18 [} 74]: User gain calibration thermocouple
Calculation of process data
Calibration
The concept calibration, which has historical roots at Beckhoff, is used here even if it has nothing to
do with the deviation statements of a calibration certificate. Actually, this is a description of the ven-
dor or customer calibration data/adjustment data used by the device during operation in order to
maintain the assured measuring accuracy.
ELX3312 and ELX3314
corresponds to an increase in measured value by 0.1°
(dec)
corresponds to an increase in measured value by 0.01
(dec)
corresponds to gain = 1.
(dec)
Version: 1.3.0
Parameterization and programming
(dec)
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