4-3
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
Figure 4-1 shows the basic block diagram of a SafeCard. The cross-hatched
blocks represent possible components of the individual PCs.
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ISA D-Bus(0:7)
Watchdog
Driver for
status display
7-Seg/LEDs
Signaling
relay
Temperature
reference
RESET logic
Fan power
supply
PWR_GOOD
generator
64 KB
SRAM
opt.
Battery
optional
X14
IOW, IOR, AEN
MEMW, MEMR, BALE
RESETDRV
CLK
IRQ
Logic
Address
decoder
Conf.
register
CS_RAM
ISA address bus (0:23)
IRQ5, 10, 11, 12, 15
LS_BUS(0:6)
LS_BUS(0:16)
LS_BUS(0:7)
ISA
Interface
Connector X2
towards LEDs
and 7-Seg.
Connector
X4 towards
motherboard
4 x 2-pin
connector
X6, 7, 8, 9
Relay
connector
X13
Reset push
button via
x2
Temp.
sensor
via x2
Figure 4-1 Functional block diagram of a SafeCard
Functional Block
Diagram
Monitoring Module