Delta AS Series Programming Manual page 746

Explanation of the timing points in the above sequence diagram:
  The LCCAL instruction is enabled and the CPoint value and the flags Trigger, Done, ADone and Error are all
cleared automatically.
  Trigger the calibration flag.
  The instruction finds a module number error and displays the error code of LC module number error
  Disable the LCCAL instruction.
  After a trigger, the LC module completes the single-point calibration and the CPoint value is added by 1 and the
Done flag changes to ON.
  Clear the trigger signal flag Trigger.
  Subsequently, the Done flag is cleared by the instruction.
  After a trigger, the LC module completes the entire calibration and the CPoint value is added by 1 and both of
the flags Done and ADone change to ON.
Example
When PLC runs, the value of the first point for calibration weight is 0 written in D0 and D1. The value of the second point
for calibration weight is 500.0 written in D2 and D3.
  When M0 switches to ON, you can use DLCCAL instruction to calibrate.
  Make sure there is no load on the weighing platform. Set M50 to ON and then start zero correction (set the value of
the first point to zero). When D100 = 1 and M100 is ON, you have the first point calibrated. M50 switches to OFF.
  Put a 500 g weight on the weighing platform, set M50 to ON and then start a 500 g calibration for the second point.
When D100 = 2 and M101 is ON, you have the second point calibrated. M50 switches to OFF and MO to OFF.
Cha p ter 6 App l ied Ins truc tio ns
6_
6-467