Siemens Simatic S7-400 - Manual (Page 472)

M7-400 Expansions
12-2
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
12.1 Overview
Introduction
You can expand your automation computer from the M7-400 range by adding
expansion modules for interface submodules, short AT modules, and/or the mass
storage module. The interface submodules can include the IF 962-COM,
IF 962-LPT, ... .
The following expansion modules are available:
• EXM 478 expansion module for up to 3 interface submodules
• ATM 478 AT adapter module for one short AT module
• MSM 478 mass storage module with hard disk and floppy disk drive and an
LPT1 printer port.
Expansion Socket
On the right-hand side of a CPU or an M7-400 application module there is a
120-pin socket (AT-ISA bus) for connecting expansions. There is a matching
connector for this socket on the left-hand side of the EXM 478, ATM 478, and MSM
478 expansion modules (Figure 12-1).
The EXM 478, ATM 478 and MSM 478 expansion modules have one expansion
socket each on the right-hand side so that further expansion modules can be
plugged in.