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7.1.5 The Logic Diagram
December 2001
Soft keys in the LOGIC DIAGRAM function :
Soft key
Function
Select Markers/Inputs/Outputs/Timers/Counters for a logic
diagram.
Show trace in code.
Save current logic diagram in an ASCII file (*.A)
Display saved logic diagram
Start and stop the dynamic display of the operand contents,
accumulator contents, and logic diagram with STOP
DISPLAY and START DISPLAY.
Start trace.
End trace.
Back to previous menu.
With the LOGIC DIAGRAM function you can graphically display the logical
states of up to 16 operands (M/I/O/T/C) at once, during which the TNC records
up to 1024 PLC scans.
The operands to be shown must be saved in a table that you create with the
SELECT M/I/O/T/C soft key. The TNC asks per dialog for the individual
positions in the table. To delete incorrect entries, simply press DEL.
You can enter a trigger condition for each operand. The TNC records 512
states both before and after a trigger event. The following are possible trigger
conditions:
n
1: Record if operand is logical 1 (trigger on positive edge).
n
0: Record if operand is logical 0 (trigger on negative edge).
If you do not need a trigger condition, answer the dialog prompt with NO ENT.
If you enter no trigger condition for any of the operands, the TNC records the
states of the operands continuously. The memory holds the most recent 1024
states at any given time.
PLC Functions
7 – 9
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