HEIDENHAIN TNC 306 Technical Manual - Manual (Page 509)

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TNC 406/TNC 306 Update Information No. 11 3/97
• FN19
With FN 19 you can sent commands (also with data) to the PLC and receive resulting values. FN
19 is to be considered an expansion of the M functions.
Example:
FN19: PLC= +11 / +Q13 / Q77
11 = 1st parameter after D280
Q13 = 2nd parameter after D284
Q77 = 3rd parameter answer to PLC
During execution of FN19 the first parameter is transferred to D280, and the second parameter
(if programmed) to D284.
The strobe M2149 is set and the control waits for the acknowledgment M2611. After
an acknowledgment is recognized, the strobe M2149 is reset and the value from D512 (if the 3rd
parameter was programmed) is transferred to this Q parameter (result parameter), and the
program run is continued. The result can be evaluated in the subsequent NC stage.
Strobes and data in the PLC:
M2149
Strobe for FN19 Set/reset NC
M2611 Acknowledgment FN19 Set/reset PLC
D280 1st value for FN19 Must be programmed
D284 2nd value for FN19 Optional
D512 Return value from PLC Optional
• Note: Change in the binary block format in an RND block
If an RND block has been used in an OEM cycle, the PLC chip must be remade!