Exclusive Or Not (Xon) - HEIDENHAIN TNC 426 PB/M Technical Manual

7.7.24 EXCLUSIVE OR NOT (XON)

Logic processing
with the
EXCLUSIVE OR
NOT command
Function
Load the operand
content into the logic
accumulator.
Gate the content of
logic accumulator
and input I4 with
EXCLUSIVE OR
NOT.
Assign the gating
result to output O2.
7 – 112
Syntax: XON (EXCLUSIVE OR NOT)
Operands: M, I, O, T, C
Action:
n
At the beginning of a logic sequence, this command functions like an LN
command, i.e., the logical state of the operand is loaded into the logic
accumulator. However, you should always begin a sequence of logical
gating operations with a load command (see L, LN, L–).
n
Within a logic sequence, gate the content of the logic accumulator and the
logical state of the operand with EXCLUSIVE OR NOT. The TNC saves the
result of the operation in the logic accumulator.
Example:
Gate the inputs I4 and marker M500 with EXCLUSIVE OR NOT, and assign the
result to output O2.
Initial state:
Input I4 = 0
Marker M500 = 0
Output O2 = ?
STL Accumulator contents [bit]
31..15 ..................... 7 ................. 0
L M500 x ..... x x x x x x x x 0 x x x x x x x
XON I4 x ..... x x x x x x x x 1 x x x x x x x
= O2 x ..... x x x x x x x x 1 x x x x x x x
HEIDENHAIN Technical Manual TNC 426, TNC 430
Operand contents [bit]
0
0
1