Wiring the S7-400
4-2
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
4.1 General Rules and Regulations for Operating the 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. You must at least comply with
these basic rules to ensure fault-free operation of the S7-400. The M7-400
modules operate similarly to the S7-400 modules. Differences in operation or data
can be found at the appropriate point or in Section 8.3 “Electrical Configuration.”
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 204 (which corresponds to
VDE 113) 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.
Tripping of the Emergency
Off device
Hazardous operating states must not occur.
Restoration of the operating
or supply voltage of the
S7-400
Hazardous operating states must not occur. No
uncontrolled or undefined restart of the system must occur.
Restart after release of the
Emergency Off device
Hazardous operating states must not occur. No
uncontrolled or undefined restart of the system must occur.
120/230 VAC supply
The following table shows which points you must observe when connecting the
S7-400 to a 120/230 VAC supply.
With ... ... you must ensure ...
buildings that suitable external lightning protection measures are
provided.
supply cables and signal
lines
that suitable internal and external lightning protection
measures are provided.
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