18 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
Figure 4 – Configuration with Multiple Controllers
CAUTION
The HC900-expansion I/O link is a private network and the switch used for the interconnection of the
HC900 Processor and Scanners must not be connected to any other LAN or WAN. Likewise, no devices
other than the HC900 components should be connected to the I/O link Switch. Failure to comply will
cause communication failures on the I/O link causing I/O modules to go in and out of their failsafe
settings.
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