1PosSSI/Digital
5.3 Terminal Assignment Diagram
ET 200S Positioning
Operating Instructions, 05/2007, A5E00124871-04
197
Connection of Relays and Contactors to the Digital Outputs
Note
Direct connection of inductivities (such as relays and contactors) is possible without external
circuiting.
If SIMATIC output circuits can be deactivated by additionally installed contacts (for example
relay contacts), you have to provide additional overvoltage protection devices at inductivities
(see the following example for overvoltage protection).
Overvoltage Protection Example
The following figure shows an output circuit that requires additional overvoltage protection
devices. Direct-current coils are wired with diodes or Zener diodes.
'LJLWDORXWSXWHJ287 'LJLWDORXWSXWHJ287
&RQWDFWLQRXWSXWFXUUHQWFLUFXLW
ZLWKGLRGH ZLWK=GLRGH
Figure 5-1 Relay contact in the output circuit
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