HEIDENHAIN TNC 306 Technical Manual - Manual (Page 368)

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TNC 416/TNC 406/TNC 306 Commands 3/2000
3.8.5 GREATER THAN OR EQUAL TO L [ ] (>=[ ]) >= [ ]
Abbreviation for PLC Editor: >= [ ] (GREATER EQUAL [ ])
Logic Byte/Word/Double
Execution time [µs] ---- 3.0 to 3.2
Number of bytes ---- 6
Operands: none
3.8.6 NOT EQUAL TO [ ] (<>[ ]) <> [ ]
Abbreviation for PLC Editor: <> [ ] (NOT EQUAL [ ])
Logic Byte/Word/Double
Execution time [µs] ---- 3.0 to 3.2
Number of bytes ---- 6
Operands: none
Function of parentheses with comparison commands:
The execution sequence in a ladder may be altered by the use of parentheses. The "open-
parentheses" command loads the contents of the Word Accumulator onto the Program Stack. The
Accumulator is now available for the calculation of intermediate results.
The "close-parentheses" instruction initiates the gating of the buffered value from the Program Stack
with the content of the complete Word Accumulator. The result is loaded again into the
Accumulator. The maximum nesting depth is 16 parentheses.
A direct transition from Word to Logic execution takes place with comparison commands. If the
comparison condition is "true", the Logic Accumulator is set to "1". If the condition is not fulfilled, the
Logic Accumulator is set to "0".