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2. EXPLANATION OF MODULE FUNCTIONS
2.6 HR877/878 Card
II - 9
2.6 HR877/878 Card
[Block diagram]
RTBUS
Buff
PLD
HR877
HR878
Rotary switch, setting, etc.
System ROM
Work RAM
16-bit bus
A
dd-on
connector
Gate array for
bus I/F
2-port RAM
MDP:Mitsubishi DataLink Processer
MPU
MDP1
*
Gate array for
transmission I/F
LED
ENCO/DECO
Tr/Re
Medium I/F
Coaxial cable
[Explanation of functions]
The HR877/878 card functions as the MELSECNET/10 (coaxial bus interface).
Sections common for coaxial and optical use (Base PCB ... HR877)
ASIC Gate array for bus interface
Memory 2-port RAM
Work RAM
System ROM
Add-on connector
Various setting switches
Sections dedicated for coaxial bus interface (Add-on PCB ... HR878)
MPU
ASIC Gate array for transmission I/F
ENCO/DECO
Tr/Re
Coaxial medium interface
Monitor LED