Siemens SIMATIC S7 System Manual page 165

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NOT logic inverter

NOT Logic inverter

Output coil and assignment box

The coil output instruction writes a value for an output bit. If the output bit you specify uses

memory identifier Q, then the CPU turns the output bit in the process-image register on or

off, setting the specified bit equal to power flow status. The output signals for your control

actuators are wired to the Q terminals of the CPU. In RUN mode, the CPU system

continuously scans your input signals, processes the input states according to your program

logic, and then reacts by setting new output state values in the process-image output

reaction stored in the process-image register to the wired output terminals.

Output coil (LAD) and output assignment box (FBD)

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

For FBD programming, you can drag the "Negate binary input" tool

from the "Favorites" toolbar or instruction tree and then drop it on an

input or output to create a logic inverter on that box connector.

The LAD NOT contact inverts the logical state of power flow input.

If there is no power flow into the NOT contact, then there is power

If there is power flow into the NOT contact, then there is no power

out := <Boolean

expression>;

expression>;

In FBD programming, LAD coils are transformed into

assignment (= and /=) boxes where you specify a bit

address for the box output. Box inputs and outputs can be

connected to other box logic or you can enter a bit

You can specify an immediate write of a physical output

using ":P" following the Q offset (example: "%Q3.4:P").

For an immediate write, the bit data values are written to

the process image output and directly to physical output.

100BBasic instructions

7.1 Bit logic

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Simatic s7-1200