Adding Dual Bus Logic - GE PACSystems RX3i Application Manual

Chapter 4. Toolchest Components
4.2

Adding Dual Bus Logic

In the ladder block named _Main, insert a new row at the beginning of the program.
While holding down the Ctrl-key, drag the program block named BUSSES and place it into the first rung. This
will create a new instance of the block. It will require a name: enter GBusses for the name.
Zoom into the ladder block named BUSSES. Note that the program block already contains multiple rungs of
logic. Program blocks in these rungs perform the following:
INIT_GB00 This structured text block defines the parameters for a dual bus (the instance is named IGB00
for "Initialize Genius Bus 00"). The block must be edited to match the specific design
characteristics of the system.
DBUS This ladder block maps the discrete and analog inputs for the dual bus (the instance is
named DB00). It does not require additional editing.
AUTO_SW This ladder block provides a simple automatic role switching method (the instance is named
Aut_Sw). It does not require additional editing, but you may wish to modify or enhance the
PLC failover operation.
The logic at this point is sufficient to service one pair of dual busses. If there are more dual busses, then
additional rungs will be required.
14 PACSystems* RX3i Genius Dual Bus Application Guide GFK-2928