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MELSEC-Q

3 SPECIFICATIONS

The following describes the network system specifications, performance specifications
and the specifications for sending and receiving link data.
For general specifications, refer to the user's manual of the CPU module to be used on
the network system.

3.1 Performance Specifications

3.1.1 Optical loop system performance specifications

Table 3.1 lists the performance of the optical loop system.

Table 3.1 Optical loop system performance specifications

Item

Remote master station

Remote I/O station

QJ71LP21 QJ71LP21G

QJ71LP21GE QJ71LP21-25 QJ71LP21S-25 QJ72LP25-25 QJ72LP25G QJ72LP25GE

Maximum
number of links
per network

LX/LY 8192

points

16384 points (Remote master station

remote sub-master station, remote I/O station: 8192 points, remote sub-master

station, remote I/O station

remote master station: 8192 points)

16384 points (Remote master station

remote sub-master station, remote I/O station: 8192 points, remote sub-master

station, remote I/O station

remote master station: 8192 points)

Maximum number of links per
station

• Remote Master Station

Remote I/O station ((LY + LB)/8 + (2

LW))

 1600 bytes

• Remote I/O station

Remote Master Station ((LX + LB)/8 + (2

LW))

 1600 bytes

• Multiplexed remote master station

multiplexed remote sub-master station ((LY + LB) /8 + (2

LW))

 2000 bytes

Maximum I/O points per remote
I/O station

X + Y

 4096 points

If the X/Y numbers are the same, only one side is taken into consideration.

Device points per
remote I/O station

8192

points

2048

points

D 12288

points

2048

points

Communication speed

10 Mbps

25 Mbps /10 Mbps /

(selected with MODE switch)

10 Mbps

Number of stations per network

65 stations (Remote master stations: 1 Remote I/O stations: 64)

Overall distance

30 km

Distance
between
stations

25 Mbps

—

SI optical cable : 200m
H-PCF optical cable : 400m
Broad-band H-PCF
optical cable : 1km

QSI optical cable : 1km

—

10 Mbps

SI optical
cable :
500m

H-PCF

optical cable :
1km

Broad-

band H-PCF
optical cable :
1km

QSI

optical cable :
1km

GI-50/125
optical cable
: 2km

GI-62.5/125
optical cable :
2km

SI optical cable: 500m

H-PCF optical cable:

1km

Broad-band H-PCF optical cable:

1km

QSI optical cable: 1km

GI-50/125
optical cable :
2km

GI-62.5/125
optical cable :
2km

Network cable

Optical fiber cable (procured by a user)

Applicable connectors

2-core optical connector plug (procured by a user)

Maximum number of networks

239 (Total including PLC to PLC networks)

Transmission path format

Duplex loop

Communication method

Token ring

Synchronization method

Frame synchronization

Coding method

NRZI code (Non Return to Zero Inverted)

Transmission format

HDCL standards (Frame format)

Error control

CRC (X

+ X

+ 1) and retry by timeover

RAS functions

•    Loop-back function due to error detection or broken cable
•    Diagnostic function for checking local link lines
•    Detection using link special relays or link special registers
•    Backup of power supply on a remote I/O station
•    Online module change in a remote I/O station

Application function

• Remote password for remote I/O station

Transient transmission

• 1:1 communication (Monitor, program upload/download, etc.)
• Various send/receive commands from the programmable controller program (READ/WRITE,REMFR/REMTO)