Mitsubishi MELSEC-A Series Reference Manual page 81

5. SPECIFICATIONS
MELSECNET data link system
Coaxial cable data link
MELSECNET
MELSECNET
mode
(Total number of slave station link points) = (Available link points for master station)
1024 points
(128 bytes)
1024 points
(2048 bytes)
1024 bytes (link parameters; first half)
1024 bytes
1024 bytes (link parameters; second half)
512 bytes
Number of I/O points
: 512 points
1.25Mbps
Half-duplex bit serial
Duplex loop
Up to 10km (32810ft.)
(Between stations: 500m (1640.5ft.))
Up to 65 stations/loop
(1 master station, 64 local/remote I/O stations)
The loopback function activated by detection of an error or cable
disconnection
The diagnostic functions such as link line check of the host station
Coaxial cable
Table 5.2 Performance specifications (Continued)
MELSECNET
mode composite mode
Up to the maximum I/O points allowed for master station CPU module *2
4096 points (512 bytes)
4096 points (8192 bytes)
512 bytes
Number of I/O
-
points
: 512 points
Frame synchronization
CMI
Conforms to HDLC (frame method)
Retry by CRC (generating polynomial X
-
-
-
*2: The A1SHCPU, A1SJHCPU, A2SHCPU, A2ASCPU(S1), A2USHCPU-S1,
Q2ASCPU(S1),Q2ASHCPU(S1), A2UCPU(S1), A3UCPU, A4UCPU, Q2ACPU(S1),
Q3ACPU, Q4ACPU Q4ARCPU can use up to 2048 points.
MELSECNET mode MELSECNET
MELSECNET
MELSECNET
Operating Mode
mode
mode
Applicability
MELSECNET/B data link system
Shielded twisted pair cable data link system
MELSECNET
MELSECNET
mode
1024 points
(128 bytes)
1024 points
(2048 bytes)
1024 bytes (link parameters; first half)
1024 bytes
1024 bytes (link parameters; second half)
512 bytes
Number of I/O points
: 512 points
125kbps/250kbps/500kbps/1Mbps
Bus system
Varies depending on the communication speed
(125kbps: 1200m, 250kbps: 600m,
500kbps: 400m, 1Mbps: 200m)
Up to 32 stations/loop
(1 master station. 31 local/remote I/O stations)
NRZl method
16 12 5
+ X + X + 1) and timeout
The diagnostic functions such as link line check of the host station
Shielded twisted pair cable
5 - 3
MELSECNET/B
MELSECNET
MELSECNET MELSECNET MELSECNET
composite mode mode composite mode
mode
MELSECNET
mode composite mode
4096 points (512 bytes)
4096 points (8192 bytes)
512 bytes
Number of I/O
-
points
: 512 points
-
-
-