HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 467)

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TNC 407/TNC 415/TNC 425 1 PLC functions 01.98
1 PLC functions
The integrated PLC in the TNC contains its own Text Editor for creating the list of instructions for the
PLC program. Commands and comments are entered via the ASCII keyboard on the control panel
(see section "Programming and editing files").
The functions TRACE and TABLE, as well as a Syntax check on entering the PLC commands and a
logical test with the Function COMPILE were introduced to make it easier to find faults in the PLC
program (see section "Test functions").
10 ms are available for a PLC run. Up to 8 000 logic commands, equivalent to 64 KB, can be
processed within this period (executable memory). A new PLC run commences every 20 ms in the
TNC 415 and every 24 ms in the TNC 407 (PLC cycle time), i.e. every 20 ms or 24 ms the inputs are
read and outputs are set.
1.1 Select PLC operation
PLC operation covers all functions for creating and testing the PLC programs, for creating the PLC
error messages and the dialogue texts for OEM cycles, the Help files and compensation lists for
non-linear axis error correction.
It can be selected as follows, using the code number 807 667:
Select NC operating mode
"Programming and editing"
↓
Press MOD
key
↓
Enter code number 807 667
↓
ENT key
↓
PLC operation is selected
(Main menu)
PLC operation can be stopped by pressing the soft key END or the END key.
Provided the TNC has not been switched off and the PLC operation has already been selected once
with the code number, it is possible to return to PLC operation quite simply, without using the code
number, by means of the MOD key and the soft key PLC EDIT.