User`s manual

26
QnA compatible 4C frame
(Format 5)
One of the message formats for the serial communication modules, which is used to perform ASCII data communication by
MC protocol.
This is the same message format as the communication frame using the protocol for the QnA series serial communication
modules.
• QnA compatible 4C frame (Format 5): QnA extension frame (Format 5)
Special function module MELSEC-QnA/A series modules with functions other than I/O functions such as A/D and D/A conversion module
User frame
Data name when the fixed format portion of messages to be sent or received between a serial communication module and
an external device is registered in the module and used for sending and receiving data. (The contents of a user frame data
should conform to the specifications of the external device.)
The data array of the head and tail sections of a message (transmission control code, serial communication module station
No., sum check, fixed data, etc.) to be sent and received is registered in the serial communication module before use.
User frame is used in MC protocol on-demand functions and data communication functions which use the non procedure
protocol.
Term Description