HEIDENHAIN TNC 306 Technical Manual - Manual (Page 328)

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TNC 416/TNC 406/TNC 306 Commands 3/2000
3.2
Set-commands
3.2.1 SET (S) S
Abbreviation for the PLC Editor: S (SET)
Operand changed Operand unchanged
Execution time [µs] 2.0 to 2.40 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 depends on the contents of the Logic Accumulator. If the Logic
Accumulator = 1, the addressed operand is set to 1, otherwise the operand remains unchanged. An
S-command is used at the end of a logic chain so that the 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 is 1, output O2 and marker M500 are to be set.
Initial state: Input I4 = 1
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 1 x x x x x x x 1
2 O I5 ... x x x x x x 1 x x x x x x x 0
3 S O2 ... x x x x x x 1 x x x x x x x 1
4 S M500 ... x x x x x x 1 x x x x x x x 1
Line 1: The contents of the operand 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 = 1: output O2 is set.
Line 4: The gating result = 1: marker M500 is set.