Flintec LDU 68.2 - Manual (Page 14)

LDU 68.1 & 68.2 Technical Manual, Rev. 12 January 2010 Page 14 of 28
8.2. Calibration Commands – CE, CM, DS, DP, CZ, CG, ZT, ZI, FD, CS
8.2.1. CE Read TAC* Counter / Open Calibration Sequence
With this command you can read the TAC counter (*TAC = Traceable Access Code) or you can open a
calibration sequence.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CE  E+00017 (example) Request: TAC counter CE17
CE 17  OK Calibration sequence active
This command must be issued PRIOR to any attempt to set the calibration parameters CM n, CI, MR, DS, DP,
CZ, CG, ZT, ZR, FD, LC, LN n or CS. In legal for trade applications the TAC counter can be used to check if
critical parameters have been change without re-verification. After each calibration the TAC counter increases
by 1.
8.2.2. CM Set Maximum Output Value
This command is used to set up the maximum output value. Permitted values are from 1 to 99 999.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CM 1
 M+030000 Request: CM 1 = 30 000 d
CE
 E+00017
(example) Request: TAC counter CE17
CE 17  OK Calibration sequence active
CM 1 50000  OK Setup: CM 1 = 50 000 d
This value will determine the point at which the output will change to “oooooo”, signifying over-range respective
the point at which the output will change the measuring range / interval size.
Note: The range, in which a scale can be set to zero (SZ) or automatic zero tracking (ZT) is active, is +/- 2% of
CM value. Factory default: CM = 99 999
8.2.3. DS Set Display Step Size
This command allows the output to step up or down by a unit other than 1.
Permitted values are 1, 2, 5, 10, 20, 50, 100 and 200.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
DS  S+00002 Request: Step size 2
CE
 E+00017
(example) Request: TAC counter CE17
CE 17  OK Calibration sequence active
DS 50  OK Setup: Step size 50
Legal for trade applications allow for 3000, 4000 or 5000 intervals. The allowed step size has to be considered.
8.2.4. DP Set Decimal Point Position
This command allows the decimal point to be positioned anywhere between leftmost and rightmost digits of the
5-digit output result. Position 0 means no decimal point. Factory default: DP = 3
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
DP
 P+00002 Request: Position of decimal point 2
CE  E+00017 (example) Request: TAC counter CE17
CE 17  OK Calibration sequence active
DP 0  OK Setup: no decimal point
8.2.5. CZ Set Calibration Zero Point
This is the reference point for all weight calculations, and is subject to TAC control.
Factory default: approx. 0 mV/V input signal
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CE  E+00017 (example) Request: TAC counter CE17
CE 17
 OK Calibration sequence active
CZ 0  OK Zero point saved