Important Notes
iv
FM 456-2 Application Function Module  Installation, Hardware, and Startup
C79000-G7076-C458-01
What is New in the FM 456-2?
In comparison to the FM 456-4, the preceding product, the FM 456, shows the
following alterations:
Feature FM 456-4 (old) FM 456-2 (new)
Processor 80486DX, 75 MHz Pentium, 120 MHz
SRAM, buffered 64 Kbytes 256 Kbytes
Reading and
writing of records
only SD0 and SD1 system records all system and user records
Main memory suitable for expansion with 16 MB RAM 16 MB RAM installed
Operating system  M7-SYS up to V2.0 inclusive
 M7-SYS RT up to V4.0 inclusive
 M7-SYS RT from V5.0
Width 25 mm (1”) 50 mm (2”)
OSD
(Flash EPROM)
yes no
Approvals
The following approvals have been granted for the  S7-400/M7-400:
UL recognition mark
Underwriters Laboratories (UL) to
standard UL 508, report E 85972
CSA certification mark
Canadian Standard Association (CSA) to
standard C 22.2 No. 142, report LR 63533
FM approval
according to Factory Mutual Approval Standard
Class Number 3611, Class I, Division 2, Group A, B, C, D.
For further information, please refer to Chapter 1 of the 
reference manual /1/
.
CE Marking
This product complies with the requirements of the EU directives which are listed
in Chapter 1 of 
reference manual /1/
.