Wiring
5-2
Distributed I/O Device ET 200M
EWA-4NEB780600602-06
5.1 Electrical Configuration
Section Subject Page
5.1.1 General Rules and Regulations on Operating an ET 200M 5-2
5.1.2 Operating the ET 200M with Process I/O Modules on a Grounded
Supply
5-5
5.1.3 Configuring the ET 200M with Ungrounded Reference Potential 5-9
5.1.4 Configuring the ET 200M with Galvanically Isolated Modules 5-10
5.1.5 Configuring the ET 200M with Non-Isolated Modules 5-12
5.1.1 General Rules and Regulations on Operating an ET 200M
Depending on the particular area of application, the ET 200M programmable
controller, as part of a plant or system, requires that you observe a number of
specific rules and guidelines.
Note the safety and accident prevention regulations that apply to specific
applications (e.g. machinery directives).
This section outlines the most important rules you must observe to integrate your
ET 200M safely into an existing plant or system.
EMERGENCY STOP Devices
EMERGENCY STOP devices complying with IEC 204 (which corresponds to
DIN VDE 113) must remain effective during all the operating modes of the plant or
system.
Starting Up a Plant Again Following Specific Events
The following table tells you what you should do when the system starts up after
the occurrence of specific events.
If ... Then ...
Startup follows a voltage drop or
failure
Startup of the ET 200M after an
interruption of bus
communication
No dangerous operating states may occur.
If necessary, force an emergency stop.
Startup follows unlocking of the
EMERGENCY STOP device
The ET 200M starts up, but the
DP master does not address the
ET 200M
There must not be an uncontrolled or
undefined startup.
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