Not - Siemens SIMATIC S7 System Manual

Program instructions
7.1 Bit logic
Logic Stack example: LAD networks transformed into STL code
LAD
7.1.5

NOT

LAD FBD
See also
Bit logic input examples (Page 182)
176
STL Description
NOT
The Not instruction (NOT) inverts the state of the power flow input.
LAD: The NOT contact changes the state of power flow input. When
power flow reaches the NOT contact, it stops. When power flow does
not reach the NOT contact, it supplies power flow.
FBD: The NOT instruction is represented as a graphical negation (bub-
ble) symbol on Boolean box input connectors and functions as a logic
state inverter.
STL: The NOT instruction changes the value on the top of the stack
from 0 to 1, or from 1 to 0.
STL
Network 1
LD I0.0
LD I0.1
LD I2.0
A I2.1
OLD
ALD
= Q5.0
Network 2
LD I0.0
LPS
LD I0.5
O I0.6
ALD
= Q7.0
LRD
LD I2.1
O I1.3
ALD
= Q6.0
LPP
A I1.0
= Q3.0
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART