Hr877/879 Card - Mitsubishi Electric MELDAS C6 Maintenance Manual

2.7 HR877/879 Card

[Block diagram]
System ROM
RTBUS
Buff
Gate array for
bus I/F
2-port RAM
PLD
[Explanation of functions]
HR877/879 functions as MELSECNET/10 (optical loop interface).
Sections common for coaxial and optical use (Base PCB ... HR877)
ASIC
Memory
Add-on connector
Various setting switches
Section dedicated for optical loop interface (Add-on PCB ... HR879)
MPU
ASIC
Optic medium I/F SI type (500m between stations)
Monitor LED
2. EXPLANATION OF MODULE FUNCTIONS
2.7 HR877/879 Card
Work RAM
16-bit bus
Add-on
connector
Rotary switch, setting, etc.
HR877
Gate array for bus interface
2-port RAM
Work RAM
System ROM
Gate array for transmission I/F
II - 11
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MPU
*
MDP2
Gate array for
transmission I/F
Medium I/F
Optical fiber cable
Medium I/F
HR879: SI type (500m between stations)
HR879
MDP:Mitsubishi DataLink Processer
LED