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2. EXPLANATION OF MODULE FUNCTIONS
2.7 HR877/879 Card
II - 11
2.7 HR877/879 Card
[Block diagram]
RTBUS
Buff
PLD
HR877
HR879
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
MDP2
*
Optical fiber cable
Gate array for
transmission I/F
HR879: SI type (500m between stations)
Medium I/F
Medium I/F
LED
[Explanation of functions]
HR877/879 functions as MELSECNET/10 (optical loop 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
Section dedicated for optical loop interface (Add-on PCB ... HR879)
MPU
ASIC Gate array for transmission I/F
Optic medium I/F SI type (500m between stations)
Monitor LED