Performance Features - Siemens SIMATIC FM 458-1 DP User Manual

Product description
2.1.3

Performance features

2-6
The FM 458-1 DP application module has been designed for high
dynamic performance closed-loop control and technological applications
in a SIMATIC S7-400 station. These control tasks can be freely
configured using CFC or optionally SFC. Furthermore, it offers a
PROFIBUS-DP connection.
 Computational performance
 64 bit RISC floating-point processor for arithmetic calculations
 fastest cycle times of 0.1 ms – typical, 0.5 ms
 32-bit controller for communication tasks
 DRAM / SDRAM working memory
 16 / 64 MB
 12 MB / 60 MB useable for user program
 the program code is loaded and expanded when initializing from
the memory module
 data memory for this operating system, user program,
communications, message buffer, trace
 SRAM (256 kB / 512 kB)
The externally buffered SRAM contains the following data, which
should be saved (non-volatile) even when the power fails:
 fault diagnostics of the operating system ("exception buffer")
 max. approx. 1000 / 2000 process quantities, configured using the
SAV function block
 data, traced using the message system or trace function
(optional SRAM configuring)
 Replaceable program memories (2, 4, or 8 MB)
 MMC (Micro Memory Card), typical size: 2 MB
 Two interfaces are available to load the user program into the
program memory:
 via an MMC card slot (loading offline), e.g. field PG, USB prommer
 directly from the PC via the MPI interface of a SIMATIC CPU
(loading online)
Application Module FM 458-1 DP - User Manual
A5E01078222-02 Edition 03.2009