HEIDENHAIN TNC 306 Technical Manual - Manual (Page 295)

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TNC 416/TNC 406/TNC 306 PLC-functions 7-5
1 PLC-functions
The integrated PLC in the TNC 406 and TNC 306 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 of the TNC 406 or the keyboard of the TNC 306 (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 can make it easier to find faults in the PLC-program (see
section "Test functions").
8 ms are available for a PLC-run. Up to 4000 logic commands, equivalent to 32 Kbytes, can be
processed within this period (executable memory). A new PLC-run commences every 40 ms/20 ms
(depending on MP1700), i.e. every 40 ms/20 ms the inputs are read and outputs are set.
The following section shows how to start PLC-operation.
1.1
Selecting PLC-operation
PLC-operation covers all functions for creating and testing the PLC-programs.
It can be selected as follows, using code number 807 667.
Select NC operating-mode
"Programming and editing"
↓
Press MOD
key
↓
TNC 306: Enter code number 807 667
NC 406: Press soft key „key code“
and enter code number 807 667
↓
TNC 306: ENT key
↓
PLC-operation is selected
(Main menu)
PLC-operation can be stopped by pressing END .