2.7 Communications with a Mitsubishi PLC (QnA-compatible 3E Frame Protocol)
Using I/O Message Communications with the MP3000 as the Master
2-140
Device Memory and Corresponding Registers in the MP3000
The following tables show the relationship between registers in the MP3000 and device memory in the
Mitsubishi Q/QnA-series PLC. Use device addresses within the ranges listed in the tables below according
to the conditions of the Mitsubishi Q/QnA-series PLC slave.
When reading data from or writing data to the I/O memory in the Mitsubishi Q/QnA-series PLC, the read
or write commands are automatically generated by assigning I/O registers to the MP3000.
• Reading
Set the input registers in the MP3000 as follows:
• Set the first address of the IW registers and the size of the read data that is to be stored in the MP3000.
• Set the address of the first register of the device memory to read from in the remote device.
•Writing
Set the output register in the MP3000 as follows:
• Set the first address of the OW registers and the size of the data in the MP3000 to be written to the I/O
memory in the Mitsubishi Q/QnA-series PLC.
• Set the first register address in the remote device of the device memory to be written to.
* Access file registers by using the notation for accessing continuous file registers: ZR for ASCII data and B0 hex for
binary data. The normal access notation (R* for ASCII data and AF hex for binary data) cannot be used.
Transfer Size
The following table lists the size of data that can be transferred using I/O message communications. Use
the data size within the ranges listed in the following table according to the conditions of the Mitsubishi Q/
QnA-series PLC slave.
Bit Device Conversion Table
Device Name
Data Range
Notation Mitsubishi PLC MP3000
Input Relays Hexadecimal X000000 to X001FFF
Read: IW0000 to IW7FFF hex
Write: OW0000 to OW7FFF hex
Output Relays Hexadecimal Y000000 to Y001FFF
Internal Relays Decimal M000000 to M008191
Latch Relays Decimal L000000 to L008191
Step Relays Decimal S000000 to S008191
Link Relays Hexadecimal B000000 to B001FFF
Link Special Relays Decimal SM000000 to SM002047
Word Device Conversion Table
Device Name
Data Range
Notation Mitsubishi PLC MP3000
Data Registers Decimal D000000 to D012287
Read: IW0000 to IW7FFF hex
Write: OW0000 to OW7FFF hex
Link Registers Hexadecimal W000000 to W001FFF
Link Special Registers Decimal SD000000 to SD002047
File Registers Hexadecimal
ZR000000 to ZR007FFF
∗
QnA-compatible 3E Frame
(Hex)
Meaning Data Size
Command Subcommand
0401 0000
Reads bit devices in units of 16 points. 16 to 4,096 points (256 words)
Reads word devices in units of one point. 1 to 256 points
1401 0000
Writes bit devices in units of 16 points. 16 to 4,096 points (256 words)
Writes word devices in units of one point. 1 to 256 points
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