Emerson PACSystems RX3i User Manual page 92

User Manual
GFK-2409B
Additionally, you must set the I/O to operate properly for redundancy:
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Genius and Field Control I/O
While you are configuring the Genius I/O, you must configure extra parameters that govern
system operation with respect to redundant PLCs and redundant (dual) Genius I/O busses.
Please note that for Genius and Field Control I/O, you must have a Handheld Monitor
available to set these parameters.
Redundant Controllers
Using the Genius Handheld Monitor (HHM), set each Genus device for Redundant
Controllers = YES.
BSM Present
Using the Genius Handheld Monitor (HHM), set the BSM Present configuration parameter
to YES. This is required whether a dual Genius I/O bus is being used.
When this parameter is configured as YES, then the output default period is extended from
3 token rotation time periods to 2.5 seconds. The extra time allows the RX3i PLCs to
exchange mastership correctly.
BSM Controller
Figure 98
If the Genius I/O device is attached directly to a dual bus, either by a Bus Switching Module
(BSM) or a Bus Interface Unit (BIU), then you must configure this device to be a BSM
Controller.
Genius Block with BSM
In the case of a Genius Block connecting to the BSM, setting the block to be a BSM Controller
allocates its first output to the control of the BSM. It is assumed that the BSM is connected
to the first output circuit.
In the case of Field Control connecting to the BIU, setting the parameter to be a BSM
Controller directs the BIU to activate its internal bus switching circuitry.
Configuring the I/O Devices
Dual I/O busses
Hot Standby controller
Chapter 7
Oct 2019
88