Exclusive Or Not; Logic Execution With The Exclusive Or Not Command - HEIDENHAIN TNC 415 Technical Manual

3.3.6 EXCLUSIVE OR NOT (XON)
Abbreviation for the PLC-Editor:
Execution time [µs]
Number of bytes

Logic execution with the EXCLUSIVE OR NOT command

Operands: M, I, O, T, C
Operation:
This command functions in different ways according to its position in the program:
a) At the start of a logic chain this command functions as a LN command, i.e. the complement of the
operand is loaded into the Logic Accumulator. This is to ensure compatibility with the TNC 355
control which did not have the special LN command.
In PLC programs for the TNC 407/TNC 415 a logic chain should always be started with a load
command (see L, LN, L–).
b) Within a logic chain the contents of the Logic Accumulator and the logic state of the operand
(M, I, O, T, C) are gated with EXCLUSIVE OR NOT.
The result of the operation is stored in the Logic Accumulator.
Example:
Input I4 and Marker M500 are to be gated with EXCLUSIVE OR NOT and the result assigned to
Output O2.
Initial state:
Line Instruction
Bit
1 L M500
2 XON I4
3 = O2
Line 1: The operand contents are loaded into the Accumulator.
Line 2: The contents of the Logic Accumulator and the Input I4 are gated with

EXCLUSIVE OR NOT.

Line 3: The gating result is assigned to Output O2.
01.98 TNC 407/TNC 415/TNC 425
XON (EXCLUSIVE OR NOT)
Logic
0.5 to 0.9
8
Input I4 = 0
Marker M500 = 0
Output O2 = ?
Accumulator Contents
31 . . .
... x x x x x x X x x x x x x x
... x x x x x x 0 x x x x x x x
... x x x x x x 1 x x x x x x x
... x x x x x x 1 x x x x x x x
3 Commands
Byte/Word Double
0.5 to 0.9 0.5 to 0.9
8 8
7 0
Constant
0.2 to 0.5
10
Operand Contents
0
0
1
7-63