PSI System Controls and Diagnostics
A500 User Manual
A500_UM_090115 Page 32 of 61
programs. The application programs are stored in the application code flash, and are loaded into
SRAM for execution. Non-volatile RAM (NVR) is available to persist application data, for
example in event of a power failure.
I/O port
I/O port
JPR2
Watchdog
switch
Reset
button
Ethernet port
Boot flash
LEDs
Fiber-optic
comms ports
RX
TX
+24 V
in
LCD connector
Mezzanine fiber-optic board connector
Figure 17. A500 cell controller board with RCM3200 Ethernet processor
+24 V input power is converted to the various voltage rails needed by the board by DC-DC
converters. The Ethernet processor board handles all aspects of the network protocol.
10.2 Expansion
A pair of connectors allow a mezzanine board containing ten more fiber-optic devices to be
fitted for the –R5T5, -R10 and –T10 options. Two I/O ports isolated by magnetic couplers allow
application-specific I/O boards to be connected within the A500 chassis.