Message Transmission; Error Response At Word Block Read/Write - Mitsubishi Electric 700 Series Instruction Manual

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) For "one-to-one message transmission", whether the other node has received data correctly or not is checked.
For "one-to-n message transmission", response is not given after receipt of a message.
One-to-one message
transmission
One-to-n message
transmission
Following functions are provided with a message transmission.
Function
Word block read/write
Network parameter read
Log data read
Log data clear
Profile read
Message loopback
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.
Error code Description
H0010 Address error
H0020 Size error
H0030 Data error
H0040 Write disable error
H0060 During reset
Message frame
1024 bytes
Request
Node 1 Node 2
Request
Node 1 Node 2
Description
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.
Reads network parameter information of other node from network.
Reads log information of other node from network.
Clears log information (Refer to page 69) of other node from network.
Reads system parameter of device profile of other node from network.
Returns message data received then performs message communication
test of device.
Odd address was specified.
Accessed address not defined.
Write size was other than one word.
A value outside the data range was specified.
The range of calibration was too narrow.
Attempted to write to monitor data.
Attempted to write to a parameter during an operation.
Attempted to write to a write-prohibited parameter.
Accessed during inverter reset.

Message transmission

Response
Node 3 Node 4
Receive Receive
Node 3 Node 4
Remarks
Receive
Refer to
Page
62
68
69
69
70
71
61
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