Wiring
4-2
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Features of the Y coupler
The PROFIBUS-DP master system is electrically isolated from the S7
backplane bus
4.1.1 General rules and regulations for operation
Introduction
When the described modules are used in a system, certain rules and regulations
must be followed that depend on the area of application.
This section provides an overview of the most important rules that must be
observed for safe integration in a system.
Specific applications
Please comply with the safety and accident prevention regulations (e.g. machine
protection guidelines) that are valid for specific applications.
Emergency stop devices
Emergency stop functions in accordance with IEC 6204 (which corresponds to
DIN VDE 113) must remain effective in all of the system’s operating modes.
Start-up of the system following specific events
The following table shows what you have to look out for when the system starts up
after certain events.
In the case of ... ...
The system starts up after a voltage
dip or power failure
Start-up of the system after
interruption of bus communication
Dangerous operating states must not be permitted
to occur. If necessary, force an emergency stop!
The system starts up after the
emergency stop system is reset
Start-up of the system without the DP
master addressing the slaves
An uncontrolled or undefined start-up must not be
permitted to occur.
24V DC power supply
The following table shows what you have to look out for in the case of the 24V
supply.
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