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4
FL REMOTE COMMUNICATION FUNCTION
Message transmission
4.8 Message transmission
Message transmission is a non-periodic data communication method to communicate to a specified node when send request
is given.
Basic function of message transmission is as follows.
(1) When a node receives a token, one frame can be sent before sending cyclic frame.
(2) The message frame size which can be sent at a time is 1024 bytes at maximum.
(3) This method applies algorithm which controls refresh time not exceeding refresh cycle permissible time.
(4) Two transmission functions are available. One is "one-to-one message transmission" to send to specified nodes, and
another is "one-to-n message transmission" to send to all nodes.
(5)
y For "one-to-one message transmission", whether the other node has received data correctly or not is checked.
y For "one-to-n message transmission", response is not given after receipt of a message.
Following functions are provided with a message transmission.
4.8.1 Error response at word block read/write
Error response may be received when reading/writing the product information of connected Mitsubishi inverter.
In such a case, error code is attached to the data portion.
The list of error code is shown below.
Function Description
Refer to
Page
Word block read/write
Performs data read/write per word unit (one address 16 bit) to the virtual
address space (32 bit address space) of other node from the network.
62
Network parameter read Reads network parameter information of other node from network. 68
Log data read Reads log information of other node from network. 69
Log data clear Clears log information (Refer to page 69) of other node from network. 69
Profile read Reads system parameter of device profile of other node from network. 70
Message loopback
Returns message data received then performs message communication
test of device.
71
Error code Description Remarks
H0010 Address error
y Odd address was specified.
y Accessed address not defined.
H0020 Size error y Write size was other than one word.
H0030 Data error
y A value outside the data range was specified.
y The range of calibration was too narrow.
H0040 Write disable error
y Attempted to write to monitor data.
y Attempted to write to a parameter during an operation.
y Attempted to write to a write-prohibited parameter.
H0060 During reset y Accessed during inverter reset.
Message frame
1024 bytes
Request
Request
Response
Receive
One-to-one message
transmission
One-to-n message
transmission
Node 1
Node 1 Node 2 Node 3 Node 4
Node 2 Node 3 Node 4
Receive Receive