Flintec LDU 78.1 - Manual (Page 16)

LDU 78.1 Technical Manual, Rev. 12 May 2011 Page 16 of 36
8.2.5. 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 up to 10 000 intervals. The allowed step size has to be considered.
8.2.6. 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
8.2.7. 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
8.2.8. CG Set Calibration Gain (Span)
This is the reference point for calibration under load, and is subject to TAC control.
Permitted values are from 1 to 99 999.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
CG  G+10000 Request: Calibration weight = 10 000 d
CE
 E+00017
(example)
Request: TAC counter CE17
CE 17
 OK Calibration sequence active
CG 15000  OK Setup: Calibration weight = 15 000 d
For calibration an input signal near the display maximum (CM) will give the best system performance. The
minimum calibration load of at least 20% is recommended. Is the calibration weight smaller than 1% of display
maximum (CM), the LDU will respond with an error message (“ERR”).
Factory default: 20 000 = 2.000 mV/V input signal
8.2.9. ZT Enable / Disable Zero Tracking
This command enables or disables the zero tracking. ZT = 0 disables the zero tracking and ZT = 1 enables the
zero tracking. Issuing the command without any parameter returns the current ZT value.
Master (PC / SPS) sends Slave (LDU XX.X) responds Meaning
ZT  Z:001 Request: ZT status
CE  E+00017 (example) Request: TAC counter CE17
CE 17  OK Calibration sequence active
ZT 0
 OK Setup: ZT = Disable
Zero tracking will be performed only on results less than +/-0.5 d at a rate of 0.4 d/sec, where d = display step
size (see DS command). The zero can only be tracked to +/- 2% of maximum (see CM n command).
Factory default: ZT = 0 [Disable]