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Chapter 2
Guidelines for Connecting the 1771 KRF
Remote I/O Networks
2 2
A remote input and output (remote I/O) network is a local area network
that supplies PLCs with digital and/or digitally encoded plant floor
information.
Remote I/O modules reside at some location other than the chassis that
contains the master PLC processor. Local I/O modules reside in the same
chassis as the master PLC processor. A chassis of remote I/O modules is
electrically connected to the devices it controls on the plant floor.
Remote and local I/O can consist of digital or digitally encoded analog
values.
You can configure PLC processors as master devices that scan adapter, or
slave devices. Slave devices monitor the I/O data and provide
information requested by the master PLC processor via block transfer
commands. This I/O information is used in the PLC ladder logic program
to control a process. The KRF module allows remote I/O information to
be transferred onto the broadband cable system, which increases the
physical distance between local PLC networks and remote I/O modules.
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