July 2013 9.8 Command Set 1773
9.8.16 SET NOT (SN)
Syntax: SN (SET NOT)
Operands: M, I, O, T, C
Action:
If the logic accumulator = 0, then set the addressed operand to 1, otherwise
do not change it. Use the SN command at the end of a sequence of logical
gating operations in order to influence an operand depending on the result of
gating. This command can be used several times in succession (see example).
Example:
Gate input I4 and I5 with OR. If the gating result is 0, then set output O2 and
marker M500.
Initial state:
Input I4 = 0
Input I5 = 0
Output O2 = ?
Marker M500 = ?
Function STL Accumulator
content
Operand content
Load the operand content
into the logic
accumulator.
L I4 0 0
Gate the content of the
logic accumulator and
input I5 with OR.
O I5 0 0
Since the result of the
operation is 0, set output
O2.
SN O2 0 1
Since the result of the
operation is 0, set marker
M500.
SN
M500
01
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