GE IC697CHS782 Integrators Rack, 17 Slots, Rear Mount
Use of these features requires the following hardware and software:
Series 90–70 PLC CPU, version 4.0 or later.
Series 90–70 PLC Bus Controller, version 4.0 or later.
Logicmaster 90 Software, release 4.01 or later.
To get back the redundant configuration, zoom into the Bus Controller
configuration screen, and re–select the Redundancy Mode.
The type of redundancy, if any. See chapter 6 for more detailed descrip tions of redundancy modes. Configuration examples for redundancy
are also shown on the following pages.
Note: if you set up a Bus Controller for redundancy, then either COPY or UN DELETE the Bus Controller’s configuration, the Redundancy Mode of the
copy or restored version will be reset to NONE and the Redundancy of blocks
on the bus will be reset to NO.
None: This is the default. None means the Bus Controller communi cates with a single bus, it is the only controller on the bus sending out puts,
and no I/O devices on the bus are set up for any type of redundan cy.
If, during subsequent configuration of devices on the bus. any is set up for re dundancy, this item will automatically be changed to Dual Bus.
Similarly, if Redund Mode is set to anything except NONE, any devices on the
bus that have already been configured will automatically have their Redundan cy parameter set to YES.
Dual Bus: In a dual bus configuration, there are two busses, each of
which has its own Bus Controller. The Bus Controllers can be either in
the same PLC or separate PLCs. Switching devices, usually Genius Bus
Switching Modules (BSMs), each link up to seven additional devices to
the dual busses.

Both dual bus and dual controller redundancy use pairs of Bus Controllers. This selection specifies the location of the other Bus Controller of
the pair. The three choices are:
Internal: If the Redundancy Mode is either dual bus or redundant control and both Bus Controllers are located in the same PLC (not necessarily in the same
rack), select Internal. You must also enter a Dual
GBC Addr (see below).
External: If the Redundancy Mode is either dual bus or redundant control and the other Bus Controller is in
another PLC, select External.
Int/Ext: Select this if Redund Mode is set to DB/RC. You
must also enter a Dual GBC Addr (see below).
If, during subsequent configuration of devices on the bus, any is set up for redundancy, this item will automatically be changed to External.
This is the amount of time that will be allowed for switching on a dual
bus. The choices are 2.5 seconds and 10 seconds. If the Redundancy
Mode is either Dual Bus or DB/RC and the total bus scan time on either
bus is expected to exceed 100mS, change the Switch Time selection to 10
seconds. If the Bus Controller stops receiving input data from a device
or devices on the bus, it will wait this specified time period before defaulting inputs or generating fault reports.
Be sure to select the same time period when configuring the devices on
the bus with a Hand–held Monitor or Write Configuration COMREQs.
This determines the length of time I/O devices on the bus allow for bus
switching, before defaulting their outputs.
If you selected Internal for Paired GBC, enter the location of the other
Bus Controller: