HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 329)

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TNC 407/TNC 415/TNC 425 10 Electronic handwheel 01.98
10.5.2 PLC program example
In the following example the positions of switch S1 for selecting the interpolation factor are
assigned by evaluating inputs I160 to I167 from the lowest permissible interpolation factor from
MP7670 to the maximum interpolation factor = 10 and transferred from the PLC to the NC (MP7640
= 5 and MP7641 = 1).
In this PLC example the minimum interpolation factor is read from MP7670 and processed with PLC
module 9032.
LB I160 Assignment of inputs I160 to I167
= B1 to byte (0V logic, negative logic)
== K0 if all inputs are 0, then
JPT 103 error message
LN B1 Inversion byte 1 (positive logic)
= B2
== K0 if all bits are 0, then
JPT 103 error message
LBL 100 Loop for bit test of "inverted inputs"
L B2 I160 to I167 in byte 2
BT B3
JPT 101 Jump when bit set, i.e. input Ixxx = 0V
L B3 prepare next bit for polling, i.e.
+ K+1 read input if input Ixxx was not 0V.
= B3
JP 100
LBL 101
PS K+7670 Read lowest interpolation factor from
PS K+0 MP7670 with PLC module 9032
CM 9032
PL B4 Result is in byte 4
L B3 Current switch position (0 to 7) plus
+ B4 minimum interpolation factor from MP7670
= B5 is new interpolation factor
<= K+10 if this is greater than 10, then
JPT 102
L K+10 the new interpolation factor is set
= B5 equal to 10.
LBL 102
PS K+4 Transfer new interpolation factor
PS B5 to all axis subdivision