Chapter 5. PLC Hardware Configuration (Primary PLC)
28
PACSystems* RX3i Genius Dual Bus Application Guide
GFK-2928
Other DBUS Functionality
Alarms Posted in PLC Fault Table
LOD
An internal function that posts
Loss-of-Device
if the device is not attached to either
Bus A
or
Bus B
,
and the default timer has expired. The time-stamped message appears in the PLC Fault Table.
AOD
If the device has been offline, this internal function posts
Addition-of-Device
if the Genius device
successfully logs onto either
Bus A
or
Bus B
. The time-stamped message appears in the PLC Fault
Table.
Real-time View of Genius Devices on Dual Busses
Device Status Bits
Zoom into the block to observe the current connection status for all configured
Genius devices on the dual bus pair. Four rungs display the device status on
Bus A
and
Bus B
. The index inside the brackets correspond to the Genius Serial Bus
Address. Figure 29 demonstrates the logic for monitoring SBA 0 through 7, so it
needs to be expanded to cover the entire bus.
Figure 29: Monitor SBA Connection Status
Switch Devices on Busses
SW_BSM
Zoom into the block to display the Switch BSM (
SW_BSM
) function block. This
function block allows the user to switch a specified Genius device to either
Bus A
or
to
Bus B
.
Figure 30: Switch BSM Logic
NOTE
: The highlighted elements may be used to control and execute the Switch BSM function.
