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MELSEC-Q Series Serial Communication Unit
A serial communication unit for the versatile MELSEC-Q series
Part Number
Configured Part Number is shown.
Serial Communication Unit Features
High-speed, large-capacity communication of up to 960 words (in the case of MC protocol communication) at speeds up to 230.4 kbps is possible.
Data can be read and written from/to the sequencer from external devices (PC, display, etc.) using the MC protocol.
Non-procedural protocol communication is supported to permit data exchange between the sequencer and a given external device (barcode reader, measuring instrument, etc.) in any communication protocol specified by the external device.
Sequencers can be programmed and monitored from a programming tool based on RS-232 serial communication using the QJ71C24N(-R2).
The QJ71C24N(-R2) has a function supporting public network modems and is capable of initializing an applicable modem and connecting with the other device to communicate with any remote device or programming tool via the modem and a public network.
The QJ71C24N(-R2) has a remote password function that prevents illegal access to the Q-series sequencers using the QJ71C24N(-R2)'s modem function.
QJ71C24N Specifications
| Interface | CH. 1 | RS-232 compliant (D-Sub 9P) | |
|---|---|---|---|
| CH. 2 | RS-422/485-compliant (2-piece terminal block) | ||
| Communication Method | Circuit | Full-duplex Communication / Half-duplex Communication | |
| MELSEC Communication Protocol Communication | Half-duplex communication | ||
| Communication Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Nonprocedural Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Bidirectional Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Synchronization Method | Asynchronous method | ||
| Transmission Speed | 50, 300, 600, 1,200, 2,400, 4,800, 9,600, 14,400, 19,200, 28,800, 38,400, 57,600, 115,200, 230,400 bps · 230,400 bps is available only on CH1 side (not available on CH2 side) · The total transmission speed of the two interfaces must be within 230,400 bps · When the send/receive data monitoring function is used, the total transmission speed of the two interfaces must be within 115,200 bps | ||
| Data Format | Start Bit | 1 | |
| Data Bit | 7/8 | ||
| Parity Bit | 1 (Vertical parity) / None | ||
| Stop Bit | 1/2 | ||
| Access Cycle | MELSEC Communication Protocol Communication | One request is processed as part of the END processing of the sequencer CPU of the installed station * The number of scans / link scans needed in this process varies depending on the specific request | |
| Communication Protocol Communication | Both send and receive requests are executed based on a dedicated command | ||
| Nonprocedural Protocol Communication | Data is sent every time a send request is made while data can be received at all times | ||
| Bidirectional Protocol Communication | Data is sent every time a send request is made while data can be received at all times | ||
| Error Detection | Parity Check | Applicable to all protocols. If applicable, select odd or even number using a parameter | |
| Checksum Code | Whether to use a checksum code for MC protocol or that for bidirectional protocol is selected by a parameter In the case of a communication protocol, whether or not a checksum code is available is determined by the selected protocol In the case of a non-procedural protocol, a checksum code is selected by a user-registered frame | ||
| Transmission Control | RS-232 | DTR/DSR Control | Available |
| RS/CS Control | Available | ||
| CD Signal Control | Available | ||
| DC1/DC3 (Xon/Xoff) Control | Available | ||
| DC2/DC4 Control | Available | ||
| RS-422/485 | DTR/DSR Control | Not available | |
| RS/CS Control | Not available | ||
| CD Signal Control | Not available | ||
| DC1/DC3 (Xon/Xoff) Control | Available | ||
| DC2/DC4 Control | Available | ||
| Circuit Configuration (Target Equipment Side: CPU Unit Side) | RS-232 | MELSEC Communication Protocol | 1:1 |
| Communication Protocol | 1:1 | ||
| Non-Procedural Protocol | 1:1 | ||
| Bidirectional Protocol | 1:1 | ||
| RS-422/485 | MELSEC Communication Protocol | 1:1, 1:n, m:n (the total of n and m+n cannot be greater than 32) | |
| Communication Protocol | 1:1, n:1 (n cannot be greater than 32) | ||
| Non-Procedural Protocol | 1:1, 1:n, n:1 (n cannot be greater than 32) | ||
| Bidirectional Protocol | 1:1 | ||
| Transmitting Distance | RS-232 | Maximum 15 m | |
| RS-422/485 | Maximum 1,200 m (total extension distance) | ||
| Number of Occupied Inputs/Outputs | 32 points (I/O assignment: intelligent 32 points) | ||
| 5 V DC Internal Current Consumption | 0.31 A | ||
| External Dimensions | Height (H) | 98 mm | |
| Width (W) | 27.4 mm | ||
| Depth (D) | 90 mm | ||
| Weight | 0.20 kg | ||
QJ71C24N-R2 Specifications
| Interface | CH. 1 | RS-232 compliant (D-Sub 9P) | |
|---|---|---|---|
| CH. 2 | RS-232 compliant (D-Sub 9P) | ||
| Communication Method | Circuit | Full-duplex Communication / Half-duplex Communication | |
| MELSEC Communication Protocol Communication | Half-duplex communication | ||
| Communication Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Nonprocedural Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Bidirectional Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Synchronization Method | Asynchronous method | ||
| Transmission Speed | 50, 300, 600, 1,200, 2,400, 4,800, 9,600, 14,400, 19,200, 28,800, 38,400, 57,600, 115,200, 230,400 bps · 230,400 bps is available only on CH1 side (not available on CH2 side) · The total transmission speed of the two interfaces must be within 230,400 bps · When the send/receive data monitoring function is used, the total transmission speed of the two interfaces must be within 115,200 bps | ||
| Data Format | Start Bit | 1 | |
| Data Bit | 7/8 | ||
| Parity Bit | 1 (Vertical parity) / None | ||
| Stop Bit | 1/2 | ||
| Access Cycle | MELSEC Communication Protocol Communication | One request is processed as part of the END processing of the sequencer CPU of the installed station * The number of scans / link scans needed in this process varies depending on the specific request | |
| Communication Protocol Communication | Both send and receive requests are executed based on a dedicated command | ||
| Nonprocedural Protocol Communication | Data is sent every time a send request is made while data can be received at all times | ||
| Bidirectional Protocol Communication | Data is sent every time a send request is made while data can be received at all times | ||
| Error Detection | Parity Check | Applicable to all protocols. If applicable, select odd or even number using a parameter | |
| Checksum Code | Whether to use a checksum code for MC protocol or that for bidirectional protocol is selected by a parameter In the case of a communication protocol, whether or not a checksum code is available is determined by the selected protocol In the case of a non-procedural protocol, a checksum code is selected by a user-registered frame | ||
| Transmission Control | RS-232 | DTR/DSR Control | Available |
| RS/CS Control | Available | ||
| CD Signal Control | Available | ||
| DC1/DC3 (Xon/Xoff) Control | Available | ||
| DC2/DC4 Control | Available | ||
| Circuit Configuration (Target Equipment Side: CPU Unit Side) | RS-232 | MELSEC Communication Protocol | 1:1 |
| Communication Protocol | 1:1 | ||
| Non-Procedural Protocol | 1:1 | ||
| Bidirectional Protocol | 1:1 | ||
| Transmitting Distance | RS-232 | Maximum 15 m | |
| Number of Occupied Inputs/Outputs | 32 points (I/O assignment: intelligent 32 points) | ||
| 5 V DC Internal Current Consumption | 0.26 A | ||
| External Dimensions | Height (H) | 98 mm | |
| Width (W) | 27.4 mm | ||
| Depth (D) | 90 mm | ||
| Weight | 0.20 kg | ||
QJ71C24N-R4 Specifications
| Interface | CH. 1 | RS-422/485 compliant (2-piece thrust-type terminal block) | |
|---|---|---|---|
| CH. 2 | RS-422/485 compliant (2-piece thrust-type terminal block) | ||
| Communication Method | Circuit | Full-duplex Communication / Half-duplex Communication | |
| MELSEC Communication Protocol Communication | Half-duplex communication | ||
| Communication Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Nonprocedural Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Bidirectional Protocol Communication | Full-duplex Communication / Half-duplex Communication | ||
| Synchronization Method | Asynchronous method | ||
| Transmission Speed | 50, 300, 600, 1,200, 2,400, 4,800, 9,600, 14,400, 19,200, 28,800, 38,400, 57,600, 115,200, 230,400 bps · 230,400 bps is available only on CH1 side (not available on CH2 side) · The total transmission speed of the two interfaces must be within 230,400 bps · When the send/receive data monitoring function is used, the total transmission speed of the two interfaces must be within 115,200 bps | ||
| Data Format | Start Bit | 1 | |
| Data Bit | 7/8 | ||
| Parity Bit | 1 (Vertical parity) / None | ||
| Stop Bit | 1/2 | ||
| Access Cycle | MELSEC Communication Protocol Communication | One request is processed as part of the END processing of the sequencer CPU of the installed station * The number of scans / link scans needed in this process varies depending on the specific request | |
| Communication Protocol Communication | Both send and receive requests are executed based on a dedicated command | ||
| Nonprocedural Protocol Communication | Data is sent every time a send request is made while data can be received at all times | ||
| Bidirectional Protocol Communication | Data is sent every time a send request is made while data can be received at all times | ||
| Error Detection | Parity Check | Applicable to all protocols. If applicable, select odd or even number using a parameter | |
| Checksum Code | Whether to use a checksum code for MC protocol or that for bidirectional protocol is selected by a parameter In the case of a communication protocol, whether or not a checksum code is available is determined by the selected protocol In the case of a non-procedural protocol, a checksum code is selected by a user-registered frame | ||
| Transmission Control | RS-422/485 | DTR/DSR Control | Not available |
| RS/CS Control | Not available | ||
| CD Signal Control | Not available | ||
| DC1/DC3 (Xon/Xoff) Control | Available | ||
| DC2/DC4 Control | Available | ||
| Circuit Configuration (Target Equipment Side: CPU Unit Side) | RS-422/485 | MELSEC Communication Protocol | 1:1, 1:n, m:n (the total of n and m+n cannot be greater than 32) |
| Communication Protocol | 1:1, n:1 (n cannot be greater than 32) | ||
| Non-Procedural Protocol | 1:1, 1:n, n:1 (n cannot be greater than 32) | ||
| Bidirectional Protocol | 1:1 | ||
| Transmitting Distance | RS-422/485 | Maximum 1,200 m (total extension distance) | |
| Number of Occupied Inputs/Outputs | 32 points (I/O assignment: intelligent 32 points) | ||
| 5 V DC Internal Current Consumption | 0.39 A | ||
| External Dimensions | Height (H) | 98 mm | |
| Width (W) | 27.4 mm | ||
| Depth (D) | 90 mm | ||
| Weight | 0.20 kg | ||
| Part Number |
|---|
| QJ71C24N |
| QJ71C24N-R2 |
| QJ71C24N-R4 |
| Part Number | Standard Unit Price | Minimum order quantity | Volume Discount | Days to Ship | Communication Interface (Transmission Standard) | CH1 interface | CH2 interface |
|---|---|---|---|---|---|---|---|
SGD 711.80 | 1 Piece(s) | 91 Day(s) | RS-232 | RS-232 | RS-422/485 | ||
SGD 711.80 | 1 Piece(s) | 91 Day(s) | RS-232 | RS-232 | RS-232 | ||
SGD 711.80 | 1 Piece(s) | 91 Day(s) | RS-422/485 | RS-422/485 | RS-422/485 |
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- The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .
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