Siemens FM 450-1 - Product Overview; Chapter Overview; Properties

Product Overview
1
1.1 Chapter overview
Section overview
This section provides you with an overview of the FM 450-1 function module.
• It informs you of what the FM 450-1 can do.
• Examples demonstrate some of the possible applications of the FM 450-1.
• You will learn how the FM 450-1 is integrated into the S7-400 automation system, and
familiarize yourself with the vital components of FM 450-1.
1.2 Properties
Properties
The FM 450-1 is a fast counter module to be used in the S7-400 automation system. There are
two counters on the module which can work in the following counting ranges as required:
• 0 to 4 294 967 295 (0 to 2
32
- 1)
• - 2 147 483 648 to + 2 147 483 647 (-2
31
to 2
31
- 1).
The maximum input frequency of the counter signals is up to 500 kHz depending on the encoder
signal.
The FM 450-1 can be used for the following counting tasks:
• Continuous counting
• Single counting
• Periodic counting
You can start and stop the count either via the user program (software gate) or via external
signals (hardware gate).
Comparison values
You can store two comparison values per counter on the module; they are assigned to the two
corresponding outputs on the module. If the counter status reaches one of the comparison
values, then the output assigned to it can be set so that it triggers control operations directly in
the process.
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC 9