July 2010 11 – 119
11.3 Diagnosis Tools in the PLC Mode
iTNC 530 provides comprehensive PLC diagnosis options.
8 Call the PLC mode. --> See “Calling the PLC mode” on page 11 – 115.
11.3.1 The TABLE function
The TABLE function provides the possibility of displaying the logic states of of PLC operands
in a table.
Call
8 Scroll through the soft-key row.
8 Soft key to call the TABLE function
8 The first soft-key row to select the operand types appears:
8 Other soft-key rows can be called.
The following describes the testing of PLC inputs and outputs for which the TABLE function can
be very helpful.
Since the PLC program was written by the machine manufacturer, PLC diagnosis often
requires his support.
Press the SET and RESET soft key only after prior consultation with the machine
manufacturer!
(In general only those inputs and outputs can be set or reset that do not already have a
potential defined by the wiring or are firmly assigned or managed by the PLC.)
The operand type is displayed at top left in the table.
In the tables for BYTE, WORD and DOUBLEWORD the display can be switched by soft key between
HEX and DECIMAL.
With the cursor keys or the GOTO key followed by an entry, the operands can be selected
within the table.
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