Glossary - Siemens SIMATIC FM 450-1 Manual

Glossary

Asymmetric
Asymmetric signals are two pulse trains phase-shifted by 90 degrees and with
Signals
a zero mark signal if required.
Configuration Assignment of modules to mounting racks, slots and addresses. When config-
uring the hardware, the user fills in a configuration table under STEP 7.
Double Evaluation
Double evaluation means that the rising edges of pulse trains A and B are
evaluated on an incremental encoder.
Encoders Encoders are used for precise acquisition of, among others, rectangular sig-
nals, paths, positions, velocities, rotational speeds, dimensions, etc.
Encoders with
Encoders with asymmetric output signals generate two pulse trains phase-
Asymmetric Ouput
shifted by 90 degrees and with a zero mark signal if required.
Signals
Encoders with
Encoders with symmetric output signals generate two pulse trains phase-
Symmetric Output
shifted by 90 degrees, with a zero mark signal if required, and the corre-
Signals sponding inverted signals.
Function (FC) In accordance with IEC 1131-3, a function (FC) is a code block without static
data. A function makes it possible to transfer parameters in the user program.
This makes functions suitable for programming frequently recurring complex
functions.
Function Module
A function module (FM) is a module that offloads the CPU of the S7 and M7
(FM)
programmable controllers of time-critical or memory-intensive process signal
handling tasks. FMs normally use the internal communications bus for high-
speed data exchange with the CPU. FM applications include: Counting, posi-
tioning, closed-loop control.
Incremental
Incremental encoders capture paths, positions, speeds, rotational speeds, di-
Encoders
mensions, etc., by counting small increments.
FM 450-1 Counter Function Module
C79000-G7076-C450-01
www.gkbpx.com
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Glossary-1