S7-200 Troubleshooting Guide
D-2
S7-200 Programmable Controller System Manual
A5E00066097-02
Table D-1 S7-200 Troubleshooting Guide (continued)
Problem SolutionPossible Causes
Communication
network is
damaged when
connecting to
an external
device.
(Either the port
on the
computer, the
port on the
PLC, or the
PC/PPI cable is
damaged.)
The communication cable can
provide a path for unwanted
currents if all non-isolated devices
(such as PLCs, computers or other
devices) that are connected to the
network do not share the same
circuit common reference. The
unwanted currents can cause
communication errors or damage
to the circuits.
• Refer to the wiring guidelines in Section 2.3,
and to the network guidelines in Chapter 7.
• Purchase the isolated PC/PPI cable.
• Purchase the isolated RS-485-to-RS-485
repeater when you connect machines that do
not have a common electrical reference.
STEP 7–Micro/WIN 32 Communication problems Refer to Chapter 7 for information about network
communications.
Error Handling Refer to Appendix B for information about error
codes.
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