Assembling and Installing Systems
A-2 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
A.1 General Rules and Regulations for Operatingthe S7-400

General Basic Rules

On account of the many possible applications of the S7-400, this chapter can only
cover the basic rules for the electrical configuration. Youmust at least comply with
these basic rules to ensure fault-free operation of the S7-400.

Specific Application

Observe the safety and accident prevention regulations applying to specific
applications, for example, the Machine Protection Guidelines.

EMERGENCY OFF Devices

EMERGENCY OFF devices complying with IEC 60204-1 (which corresponds to
VDE 0113-1)must remain effective in all operating modes of the plant or system.

Reactions of the Plant after Certain Events

The following table shows how you must respond to the reactions of a plant to
certain events.
Event Requirement
Failure of the operating or
supply voltage of the S7-400
Hazardous operating states must not occur.
Trippingof the Emergency
Offdevice
Hazardous operating states must not occur.
Restoration of the operating
or supply voltage of the
S7-400
Hazardous operatings tatesm ust not occur.No
uncontrolled or undefined restart of the system must occur.
Restart after releaseof the
Emergency Offdevice
Hazardous operatings tatesm ust not occur.No
uncontrolled or undefined restart of the system must occur.