HEIDENHAIN TNC 426 PB - Compute Shortest Direction Program Module

December 2001 Tool Changer 6 – 451
COMPUTE
SHORTEST
DIRECTION
program module
The PLC ascertains the direction of tool-magazine movement for the shortest
traverse distance to the desired pocket number.
The direction is saved in M3042:
M3042 = 0: Backward
M3042 = 1: Forward
No
Magazine
forward
Yes
Fetch search
pocket from data
stack to NOMREG
ABSREG<_
MEGREG
No
ABSREG<_
MEGREG
M3042 = 0
Yes
End
Magazine
reverse
No
Yes
Yes
M3042 = 0: backward
M3042 = 1: forward
Save absolute
value from
ISTREG-NOMREG
difference to
ABSREG
Divide number of
mag. pockets by
two and save to
MAGREG
NOMREG>
ISTREG
NOMREG>
ISTREG
No
M3042 = 1