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MELSEC-Q
3 SPECIFICATIONS
[Bit ON timing]
(a) When I/O communication is started
1) If automatic start has not been set
When I/O Communication Request (Y11) is turned ON, parameter check
is made. When the parameter check succeeds, the corresponding bit of
"Each Node Configuration Status" turns ON, and I/O Communicating
(X01) then turns ON.
2) If automatic start has been set
When power is switched ON, parameter check is made automatically.
When the parameter check succeeds, the corresponding bit of "Each
Node Configuration Status" turns ON, and I/O Communicating (X01)
then turns ON.
(b) When "Parameters for the master function" are saved to flash ROM
When Save Parameter To Flash ROM Request (Y17) is turned ON,
parameter check is made. When the parameter check succeeds, the
corresponding bit of "Each Node Configuration Status" turns ON, and Saving
Parameter To The Flash ROM Completion (X06) and Save Parameter To
The Flash ROM (X07) then turn ON.
[Bit OFF timing]
(c) When I/O communication is started after disconnection of the slave node
registered to the "Parameters for the master function", when I/O communication
is started after removal of the registration of the slave node registered to the
"Parameters for the master function" at the time of saving the "Parameters for
the master function" to the flash ROM, or when the "Parameters for the master
function" are saved to the flash ROM, parameter check is made. When the
parameter check succeeds, the corresponding bit turns OFF in "Each Node
Configuration Status" of the slave node whose registration has been removed.
(d) When power of master station is switched from OFF to ON or PLC CPU is reset
When the power of the master station is switched from OFF to ON or the
PLC CPU is reset, all bits of "Each Node Configuration Status" turn OFF.
(9) Each Node Communication Status (addresses 01BC
H
to
01BF
H
/444 to 447)
These addresses store whether I/O communication being made to each slave
node is normal or not when I/O Communicating (X01) is ON.
When I/O Communicating (X01) is OFF, all bits are OFF.
• When the corresponding bit is ON: Communication in progress
• When the corresponding bit is OFF: Communication is stopped.
Table 3.18 lists the buffer memory address and node number corresponding to each bit.
Table 3.18 Corresponding node number of each bit with each node in
communication status
Buffer memory address Corresponding node number of each bit
(hexadecimal) Bit 15 Bit 14
…
Bit 1 Bit 0
01BC
H
Node 15 Node 14
…
Node 1 Node 0
01BD
H
Node 31 Node 30
…
Node 17 Node 16
01BE
H
Node 47 Node 46
…
Node 33 Node 32
01BF
H
Node 63 Node 62
…
Node 49 Node 48