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MELSEC-Q
3 SPECIFICATIONS
(9) Each Node Communication Status (addresses 01BC
H
to
01BF
H
/444 to 447)
These addresses store whether or not the normal I/O communication to each
slave node is in progress.
• 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
(10) Each Node Obstacle Status (addresses 01C4
H
to 01C7
H
/452 to
455)
These addresses store whether or not a communication problem had occurred in
each slave node.
• When the corresponding bit is ON: Problem information exists.
• When the corresponding bit is OFF: No error information exists.
Use the following procedure to turn OFF the corresponding bit.
(a) Using the message communication area of the buffer memory, execute the
readout of the communication error information of the corresponding node.
(For information on the readout of communication error information, see
Section 3.4.2, (1) message communication command, (2) message
communication result, and (3) message communication data.)
(b) When the readout of communication error information is executed, the
corresponding bit is automatically turned OFF.
Table 3.19 lists the buffer memory address and node number corresponding
to each bit.
Table 3.19 Corresponding node number of each bit when each node is in
obstacle status
Buffer memory address Corresponding node number of each bit
(hexadecimal) Bit 15 Bit 14
…
Bit 1 Bit 0
01C4
H
Node 15 Node 14
…
Node 1 Node 0
01C5
H
Node 31 Node 30
…
Node 17 Node 16
01C6
H
Node 47 Node 46
…
Node 33 Node 32
01C7
H
Node 63 Node 62
…
Node 49 Node 48
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