cnc.info.pl - FORUM CNC

Dear members of the forum, please tell me if there are among you those who understand the PLC programming of the Heidenhain stand iTNC530
I would be happy if you offer links to literature on this issue.
I need to deal with the PLC program Lubrication.src.
   GLOBAL LUBRICATION
  ; ----------------------------
    LBL LUBRICATION
  ; ----------------------------
    L I9; TLAKOVY SPINAC MAZANI PRICNIK
    O I8; TLAKOVY SPINAC MAZANI OSY
    AN T69; PRODLOUZENI CASU PO TLAK SPIN
    O M4819; NIZKA HL MAZACIHO OLEJE
    ON I3
    R O21; MOTOR MAZANI
    R O20; MAGNET
****************
    L O10; UVOLNIT W
    O M7103; MAZANI W
    S O21; MOTOR MAZANI
    S O20; MAGNET
    R M4818; PORUCHA MAZANI
****************
    L W1056; START MAZANI PODRAZE
    == K1
    = M7100; MAZANI X

    L W1056
    == K2
    = M7101

    L W1056
    == K4
    = M7102; MAZANI Z

    L W1056
    == K8
    = M7103; MAZANI W

    L M7100
    O M7101
    O M7102
    O M6020; SK MAZANI
    S O21; MOTOR MAZANI
    R M4818; PORUCHA MAZANI
****************
    L M4818; PORUCHA MAZANI
    ON I3
    R O21; MOTOR MAZANI
    R O20
****************
    L O21, MOTOR MAZANI
    IFT
    LK31
    = W1058; RESET MAZANI PO DRAZE
    ENDI
****************
    LN O21; MOTOR MAZANI
    IFT
    L K0
    = W1058; RESET MAZANI PODRAZE
    ENDI
****************
    L I9; TLAKOVY SPINAC MAZANI PRICNIK
    O I8; TLAKOVY SPINAC MAZANI OSY
    = N T21; PRODLOUZENI CASU PO TLAK SPIN

 EM
I do not understand the following line:
L K0
= W1058; RESET MAZANI PODRAZE

What is K0? Where does it come from?