Definitions and Descriptions of Terminology
The following table lists the definitions and descriptions of terminology used in this manual and related manuals for the Q series serial communication modules.
Terms | Description | |
| One of the message formats for the serial communication module for performing communication | |
| using the MC protocol and ASCII code data. | |
A compatible IC frame | This is the same message format as when communicating using the protocol for the A series | |
(Formats 1 to 4) | computer link modules. Device memory read/write operations for the QCPU are allowed within | |
| the device range of the AnACPU. | |
| For details, see Chapter 5 of the Reference Manual. | |
| A communication procedure for the serial communication modules and one of the data | |
Bidirectional protocol | communication functions for communicating any data between the PLC CPU and an opposite | |
| device. Details are explained in Chapter 7. | |
| A mode of interface operation to communicate data with external devices using a function | |
Independent operation | specified in each communication protocol setting. Two interfaces of serial communication | |
| modules do not interact. | |
| The operation mode of each of the two interfaces for a serial communication module that are | |
| connected to external devices and linked to one another in order to send/receive data to/from the | |
Linked operation | external devices. | |
The two interfaces communicate data using the identical | ||
| ||
| protocol (identical format) or non procedure protocol) and the identical transmission | |
| specifications. (Linked operation using the bidirectional protocol is not allowed.) | |
| A communication procedure for the Q series serial communication modules or the Ethernet | |
| interface modules, and a name of communication method for accessing to the PLC CPU from an | |
MELSEC communication protocol | opposite device. (This is called the MC protocol in this manual.) | |
(MC protocol) | There are two communication methods; one uses ASCII code data and the other uses binary | |
| code data. | |
| Details are explained in the Reference Manual. | |
| This function registers character data (messages) to be sent to external devices (mainly printers) | |
Message send function | in the serial communication module as an user frame in advance, and sends the registered data | |
(Printer function) | for multiple user frames using the non procedure protocol (sent by an instruction from the PLC | |
| CPU). | |
Multidrop connection | A name of the connection when multiple external devices or other serial communication modules are | |
connected in a 1:n or m:n mode using the serial communication module's | ||
| ||
| An user's communication procedure and one of the data communication functions for | |
Non procedure protocol | communicating any data between the PLC CPU and an opposite device. Details are explained in | |
| Chapter 6. | |
| One of the message formats for the serial communication module for performing communication | |
| using the MC protocol and ASCII code data. | |
QnA compatible 2C frame | This is the same message format as the communication frame using the protocol for the QnA | |
(Formats 1 to 4) | series serial communication modules. | |
| • QnA compatible 2C frame (Formats 1 to 4): QnA simplified frame (Formats 1 to 4) | |
| Details are explained in Chapter 4 of the Reference Manual. | |
| One of the message formats for the serial communication module for performing communication | |
QnA compatible 3C frame | using the MC protocol and ASCII code data. | |
This is the same message format as the communication frame using the protocol for the QnA | ||
(Formats 1 to 4) | ||
series serial communication modules. | ||
QnA compatible 4C frame | • QnA compatible 3C frame (Formats 1 to 4): QnA frame (Formats 1 to 4) | |
(Formats 1 to 4) | ||
• QnA compatible 4C frame (Formats 1 to 4): QnA extension frame (Formats 1 to 4) | ||
| Details are explained in Chapter 3 of the Reference Manual. |
A - 21 | A - 21 |