This explains how to connect to Mitsubishi Electric's PLC.
References
●"Common Items" describes common specifications and points to note regarding the communication settings of our communication drivers. If you are using our products for the first time, please first refer to the contents of "Common Items".
●For details on how to set addresses for tags, please refer to the description in "Tag Section".
●This manual does not explain the details of the settings on the connected device or the device specifications, etc. For detailed settings and procedures for the connected device, please refer to the manual for the device, such as the following:
iQ-R series Reference Manual |
・MELSEC iQ-R Ethernet User's Manual (Advanced) ・"Q-Compatible Ethernet Interface Unit" User's Manual (Application Edition) etc. |
iQ-F series Reference Manual |
・MELSEC iQ-F FX5 User's Manual (Ethernet Communication Edition) etc. |
Q Series Reference Manual |
・"Q Compatible Serial Communication Unit" User's Manual (Application Edition) ・"Q-Compatible Ethernet Interface Unit" User's Manual (Application Edition) etc. |
QnA Series Reference Manual
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・"Serial Communication Unit" User's Manual (Detailed) - "Serial Communication Unit" User's Manual (Hardware Edition) ・"QnA Compatible Ethernet Interface Unit" User's Manual (Detailed) etc. |
A-Series Reference Manual
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- "Computer Link/Multidrop Link Unit" User's Manual ・"Ethernet Interface Unit" User's Manual (Detailed) etc. |
FX0/2 series Reference Manual
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- "FX485PC-IF RS485 Interface Unit" User's Manual ・"FX Series Micro Sequencer" User's Manual etc. |
About the protocol
There are two main ways to connect to a Mitsubishi Electric MELSEC series PLC.
Public Protocol |
The connection is made using a publicly available protocol.
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Private Protocol |
The connection is made using a private protocol that is not publicly available.
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Please select a public protocol when connecting via RS-232C or Ethernet. If you are using a different method (special connection such as MELSECNET or CC-Link), please select a private protocol.
In addition, the following RS-232C and Ethernet connections support both private and public protocols. The basic functions are the same regardless of whether you select a public or private protocol, but public protocols are faster in terms of communication time and connection processing at the start of communication than private protocols. Therefore, unless there is a specific reason not to, we recommend using public protocols.
type |
Communication Method |
Connection Unit |
Q Series Q Mode |
RS-232C |
Equivalent to QJ71C24 |
QnA Series |
RS-232C |
Equivalent to AJ71QC24 |
A-Series |
RS-232C |
Equivalent to AJ71UC24 |
A-Series |
RS-232C |
Equivalent to AJ71C24 |
Q Series Q Mode |
Ethernet |
Equivalent to QJ71E71 |
QnA Series |
Ethernet |
Equivalent to QJ71QE71 |
A-Series |
Ethernet |
Equivalent to AJ71E71 |
Example: Average measurement time of 100 times on A2U/AJ71UC24 (19200bps)
Average read time for "X0000" |
Average time to read consecutive areas "D0000" to "D0999" |
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Private Protocol |
49ms |
Private Protocol |
3305ms |
Public Protocol |
36ms |
Public Protocol |
2756ms |
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If a private protocol is used, it will take 3 to 4 seconds for the connection process to start. |
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The private protocol has limitations on the OS that it supports. For information on supported OS, please refer to "Operating Environment." |