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Troubleshooting
9-22
SIMATIC 545/555/575 System Manual
Checking RS-485 (Twisted Pair) Cable Installation (continued)
Line-to-line resistance that is above the maximum specified in Table 9-6
may be caused by the following:
Incorrect termination resistors are installed.
Fewer than two termination resistors are installed: always use at least
one termination resistor, even with the simplest installation.
The cable is open between the point of measurement and one or both of
the termination resistors.
Resistance above
Maximum
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