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MELSEC-Q
1 OVERVIEW
1
(4) When the module functions as a master node of DeviceNet, I/O communication
and message communication with a DeviceNet slave node are possible.
(5) When the module functions as a master node of DeviceNet, the module can
communicate with a maximum of 63 slave nodes.
(6) Selection is available from four types of I/O communication methods when this
module functions as a master node in DeviceNet. They are polling, bit strobe,
change-of-state and cyclic which are defined in DeviceNet.
However, only one type of communication method can be selected for each slave
node.
Slave node 1 Slave node 2 Slave node 3 Slave node 4
QJ71DN91
DeviceNet network
Polling
Bit strobe Cyclic
Change-of-state
For I/O communication, see Section 3.2.1.
(7) When the module functions as a master node of DeviceNet, an I/O communication
with input of 256 words (4,096 points) and output of 256 words (4,096 points) can
be performed.
(8) When the module functions as a master node of DeviceNet, a message
communication of 240 byte data can be performed at one time.
(9) When the module functions as a slave node of DeviceNet, I/O communication with
input of 64 words (1,024 points) and output of 64 words (1,024 points) can be
performed.
(10) When the module functions as a slave node of DeviceNet, I/O communication can
be performed via polling.