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Hardware Configuration (HWC)
50 CIMPLICITY Logic Developer - PLC Version 4.00 GFK-1918D
4
Redundancy (Series 90™-70 and PACSystems™ RX7i
only)
In redundant systems, two units are set up and configured to share the
responsibility of a single unit. If one unit fails or is taken offline, the other unit
assumes responsibility without interrupting operation of the entire system.
There are three types of redundant systems:
■
Basic CPU Redundancy (Series 90™-70 only)
■
Genius Redundancy
■
CPU Redundancy Over Genius (Series 90™-70 only)
Basic CPU Redundancy
(Series 90™-70 CPUs CGR772 and CGR935 only.) To implement CPU
redundancy, a single target is associated with two physical PLCs, a Primary and
a Secondary. Both PLCs share the same logic, but each has its own Hardware
Configuration (HWC): Primary or Secondary. The selected HWC is the HWC that
you can go online with, download to, upload from, and so on.
Series 90™-70 rack systems support three types of basic CPU redundancy. These
redundant systems can be used in combination with Genius redundancy schemes.
■
Single Bus with Preferred Master - uses a single Genius bus with one or more
bus controllers in each PLC. The primary unit is always chosen as the active
unit when the units initially synchronize.
■
Single Bus with Floating Master - uses a single Genius bus with one or more bus
controllers in each PLC. No switchover occurs on initial synchronization to
make the primary unit the active unit.
■
Dual Bus with Floating Master - uses dual busses with one or more bus
controllers in each PLC. No switchover occurs on initial synchronization. Bus
Switching Modules (BSMs) are required in accordance with configuration of a
dual bus network. This option provides redundancy of both the PLC and the I/O
bus.
Navigation: Project Tab
HWC Node
CPU Redundancy
(Series 90™-70 only)