7 assign (=) – HEIDENHAIN TNC 407 (243 020) Technical Manual User Manual
Page 504
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3.1.7 ASSIGN (=)
Abbreviation for the PLC-Editor:
= (ASSIGN)
Logic
Byte/Word
Double
Constant
Execution time [µs]
0.2 to 0.5
0.2 to 0.5
0.2 to 0.5
----
Number of bytes
4
4
4
Logic execution with the ASSIGN command
Operands: M, I, O, T, C
Operation:
ASSIGN in conjunction with the Logic-Operands (M, I, O, T, C) copies the contents of the Logic
Accumulator to the addressed operand. The = command is only used at the end of a logic chain in
order that a gating result is available. The command may be used several times in succession (see
example).
Example:
Input I4 and Input I5 should be gated with AND and the result assigned to Outputs O2 and O5.
Initial state:
Input
I4 = 1
Input
I5 = 0
Output
O2 = ?
Output
O5 = ?
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
A I5
... x x x x x x 0 x x x x x x x
0
3
= O2
... x x x x x x 0 x x x x x x x
0
4
= O5
... x x x x x x 0 x x x x x x x
0
Line 1:
The operand contents are loaded into the Logic Accumulator.
Line 2:
The contents of the Logic Accumulator and Input I5 are gated with AND.
Line 3:
The gating result is assigned to Output O2.
Line 4:
The gating result is assigned to Output O5.