Specifications

4/21Schneider Electric
4
A hot standby system controls the I/O drops on a remote I/O (RIO) network. The local
backplanes for the primary and standby controllers each require a Quantum CPU, an
RIO head-end adapter module and a 140 CHS 110 00 Hot Standby module. Critical
I/O should never be used in the local backplane because it will not be switched over
when primary control shifts from one controller to the other.
The two 140 CHS 110 00 Hot Standby modules are connected to each other by a
special fiber optic cable. This link allows the standby controller to maintain the current
system status of the primary controller. The two RIO head-end adapter modules
connect to the RIO trunk cable via an MA-0186-100 splitter.
A hot standby system can also support a redundant RIO cable topology. The coaxial
cables running from the two cable ports on the 140 CRP 932 00 head-end adapters
in the two controllers are connected to the redundant RIO cable by separate
MA-0186-100 splitters.
Hot standby cable topologies
Primary PLC Standby PLC
Fiber optic cable
Splitter
Coaxial cable
Self-terminating
F-adapter
Self-terminating
F-adapter
RIO drop 1 RIO drop 2 Last RIO drop
Tap Tap Terminated tap
Primary PLC Standby PLC
Fiber optic cable
Splitter
RIO drop 1 RIO drop 2 Last RIO drop
Splitter
Quantum automation platform 4
Hot standby modules
Topologies 0