Preface
Purpose of the Manual
The information given in this manual makes it possible for you to:
• install and wire an S7-400 memory programmable controller
• configure an M7-400 automation computer for mechanical and electrical
installation
A description of the functions and technical specifications of the signal modules,
power supply modules and interface modules can be found in the reference
manual Module Specifications.
Required Basic Knowledge
General knowledge of the field of automation engineering is required in order to
understand the manual.
Target Group
This manual is aimed at people with the required qualifications to commission,
operate and maintain the products described.
Where is this Manual valid?
The manual is valid for the S7-400 and M7-400 programmable controllers.
Changes compared to the previous version
Section 2.5 and Appendix A have been updated since the previous edition of the
“Hardware and Installation” manual.
Note: You can recognize the previous edition of this ”Hardware and Installation”
manual by the number that appears in the footer: A5E00069480-03.
The number of the current edition is: A5E00069480-04.

Certification
The SIMATIC S7-400 product range has the following certificates and approvals:
• Underwriters Laboratories, Inc.: UL 508 (Industrial Control Equipment)
• Canadian Standards Association: CSA C22.2 Nummer 142, tested (Process
Control Equipment)
• Factory Mutual Research: Approval Standard Class Number 3611.
You can find details on the certificates and approvals in the “Module Specifications”
manual.
CE Labeling
The SIMATIC S7-400 product range complies with the requirements and protection
objectives of the following EU directives:
• EC low voltage directive 73/23/EEC
• EC electromagnetic compatibility directive 89/336/EEC
C-Tick Mark
The SIMATIC S7-400 product range complies with the requirements of the
AS/NZS 2064 standard (Australia and New Zealand).
Standards
The SIMATIC S7-400 product range complies with the requirements and criteria of
the IEC 61131-2.