Mitsubishi MELSEC-A Series Reference Manual page 19

1. OVERVIEW
(5)
The information mentioned above (1) to (5) is summarized in Table 1.2.
Link parameter types and the number of link points per station
(a) MELSECNET mode
1) Link parameter is only one type.
2) Maximum number of link points per station
Master station and local station : 1024 bytes/station
Remote I/O station
(b) MELSECNET mode
1) Link parameter
Link parameter is divided into two types (first/second half link parameter).
Data link is also possible by setting the first half link parameter only.
2) Maximum link points per station
• For stations with only first half link parameters set:
Master station and local station: 1024 bytes/station
• For stations with both first and second link parameters set:
Master station and local station: 2048 bytes/station
(c) MELSECNET composite mode
1) Link parameter
Link parameter is divided into two types (first/second half link parameter).
(When setting first half link parameter only, its function is the same as that of
the MELSECNET mode.)
• First half link parameters should be assigned to master stations, local
stations, and remote I/O stations.
• Second half link parameters should be assigned to master and local
stations that are compatible with MELSECNET
Second half link parameters cannot be assigned to remote I/O stations or
MELSECNET mode-compatible local stations.
2) Maximum link points per station
• For stations with only first half link parameters set:
Master station and local station: 1024 bytes/station
Remote I/O station
• For stations with both first and second link parameters set:
Master station and local station: 2048 bytes/station
: 512 bytes/station (I/O is 512 points of
X/Y0 to 1FF per station)
: 512 bytes/station (I/O is 512 points of
X/Y0 to 1FF per station)
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mode only.