Chapter 5. PLC Hardware Configuration (Primary PLC)
GFK-2928
December 2017
27
5.6
Dual Bus Function Block
The main function of the Dual Bus (
DBUS
) function block is to remap the discrete and analog inputs from the
backup bus to the main bus by monitoring the status bits of the Genius devices that are installed on the dual
bus pair.
Figure 28: Dual Bus Function Block
These are the external connections:
Input
DB
This receives the Genius bus parameters (via a variable of “
user defined type
”
G_Bus
). Note that the
parameters are configured using the function blocks derived from either
INIT_GB00
or
INIT_GBnn
.
Output
PNCST
Provides a copy of the status information for the associated PROFINET Controller module.
A_PSD
Provides a copy of the Genius Communication Gateway status information from
Bus A
.
B_PSD
Provides a copy of the Genius Communication Gateway status information from
Bus B
.
DSB_A
Provides a copy of the device connection status for all Configured Genius devices on
Bus A
.
DSB_B
Provides a copy of the device connection status for all Configured Genius devices on
Bus B
.
CSB:
Provides device connection status for all configured Genius devices on the dual bus pair.
