
Troubleshooting
9-25
SIMATIC 545/555/575 System Manual
9.11 Troubleshooting 575 Improper Login
If the 575 CPU does not log in to the local I/O properly, or if other vendors’
modules are not communicating properly, first check to make certain that
the daisy-chain backplane dipswitches are set correctly. Switches
immediately to the left of installed modules should all be set to the left (Off)
position. All unused slots should have their associated switches set to the
right (On) position.
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