Test Functions For The Plc Program; Trace Functions; Logic Diagram - HEIDENHAIN TNC 415 Technical Manual

1.6 Test functions for the PLC program

1.6.1 TRACE functions

The TRACE function makes it possible to check the logical states of the markers, inputs, outputs,
timers and counters as well as to test the contents of Byte, Word and Doubleword.
These functions are available from the Main menu by using the soft key TRACE.
The list of instructions for the compiled program will then be displayed. In addition, the contents of
the Operand and Accumulator for each line of the program are shown in HEX or decimal code. Every
active command in the LIST is identified with a "*". The cursor keys or the GOTO function can be
used to display the required portion of the program.
The soft keys now have the following meaning:
HEX ↔ DECIMAL
The contents of the Operands and the Accumulators can be displayed either in decimal or HEX code.
The soft key can be used to toggle the display.
START/STOP DISPLAY
The dynamic display of the Operands and the Accumulators can be frozen with STOP DISPLAY.
On operating START DISPLAY they will again be continuously updated.
Further soft key functions are described in the next section.

1.6.2 Logic diagram

The logical states of up to 16 Operands (M, I, O, T, C) can be shown graphically and simultaneously
on the VDU screen. 1 024 PLC runs can be recorded.
The selection is made by soft key SELECT M/I/O/T/C, which makes it possible to create a table with
the required Operands. The individual positions in the table are determined by dialogue. Wrong
entries can be erased with the DEL key. For each Operand a trigger condition can be entered. 512
states are recorded before and 512 after a trigger event. The following trigger conditions are
possible:
"1" => Record when Operand is logical "1"
(Triggering on positive edge)
"0" => Record when Operand is logical "0"
(Triggering on negative edge)
If no trigger condition is wanted then confirm with NO ENT.
If no trigger condition is entered for any of the Operands then the Operand states will be
continuously recorded and the last 1024 remain in memory.
01.98 TNC 407/TNC 415/TNC 425 1 PLC functions 7-11