22
XRC
15.85
G4
Figure 20: XRC
G4
6890 with optional keypad
Optional Totalflow input/output modules
In addition to Totalflow’s enhanced on-board I/O capabilities, the hardware functionality of the XSeries can be extended in a
flexible and friendly way by adding modular I/O as needed (see Figure 21). Totalflow I/O (TFIO) modules are designed to
accommodate low power, harsh environments and economical cost requirements. The system automatically recognizes the
module types and configures the I/O Scanner subsystem accordingly.
The modules are interfaced to the XRC
G4
board by an I
2
C bus. On top of this bus, Totalflow has implemented an efficient I/O
protocol to exchange information between the modules and the XRC
G4
board. The bus operates in a master/slave mode, with
the main board acting as master.
