HEIDENHAIN TNC 306 Technical Manual - Manual (Page 331)

3/2000
TNC 416/TNC 406/TNC 306 Commands 7-41
3.2.4 RESET NOT (RN) RN
Abbreviation for the PLC-Editor: RN (RESET NOT)
Operand changed Operand unchanged
Execution time [µs] 2.0 to 2.4 1.0 to 1.4
Number of bytes 8 ( 6 )
Byte value in parentheses:
With certain preceding program sequences the command may be shortened.
Operands: M, I, O, T, C
Operation:
The function of the command is dependent upon the contents of the Logic Accumulator. If the Logic
Accumulator = 0, then the addressed operand is set to 0, otherwise the operand remains
unchanged. An RN command is used at the end of a logic chain, in order that a gating result may
influence the operand. The command may be used several times in succession (see example).
Example:
Inputs I4 and I5 are to be gated with OR.
If the gating result = 0, Output O2 and Marker M500 are reset.
Initial state: Input I4 = 0
Input I5 = 0
Output O2 = ?
Marker M500 = ?
Line Instruction Accumulator contents Operand contents
Bit 31 . . . 7 0
... x x x x x x X x x x x x x x
1 L I4 ... x x x x x x 0 x x x x x x x 0
2 O I5 ... x x x x x x 0 x x x x x x x 0
3 RN O2 ... x x x x x x 0 x x x x x x x 0
4 RN M500 ... x x x x x x 0 x x x x x x x 0
Line 1: The operand contents are loaded into the Accumulator.
Line 2: The contents of the Logic Accumulator and input I5 are gated with OR.
Line 3: The gating result = 0: Output O2 is reset.
Line 4: The gating result = 0: Marker M500 is reset.