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QD51 Mitsubishi MELSEC-Q Series Intelligent communication
Discontinued by Mitsubishi Electric (Factory Automation) — we can still source the original QD51 (new, used or refurbished, subject to availability). Request a quote below.
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Quick facts
| Availability | Confirmed on request |
| Category | Mitsubishi MELSEC-Q Series – Information/network |
| Lifecycle | Discontinued |
| Warranty | 12-month (new) · 3-month (used/refurbished) |
Shipping & availability
Can I still buy the QD51 now that it is discontinued?
Yes. Mitsubishi Electric (Factory Automation) has discontinued the QD51, but sourcing discontinued parts is what PartnerPLC specialises in — new old stock, used and refurbished units. Request a quote and we'll confirm availability, condition and lead time.
When can QD51 be shipped?
QD51 is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.
Can I pick up QD51 in person?
Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.
Is express delivery available?
Yes — mention it when you request a quote for QD51 and we'll include express shipping options in our reply.
My factory is down and I need this urgently — can you help?
For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for QD51, subject to availability and destination.
The Mitsubishi Electric QD51 is a intelligent communication in the MELSEC-Q Series. Module for running BASIC program, RS-232: 2 channels. Mitsubishi Electric has discontinued it (2017/02 Discontinued); PartnerPLC sources discontinued Mitsubishi parts on the surplus market for maintenance of existing machines. Specifications and manuals below are Mitsubishi Electric's own data.
Specifications
Product
| Series | MELSEC-Q Series |
| Category | Intelligent communication |
| Sales status | 2017/02 Discontinued (Mitsubishi Electric) |
| Outline | Module for running BASIC program, RS-232: 2 channels |
Specifications
| Programming language | AD51H-BASIC (Interpreter, Compiler) |
| Number of tasks | 2 |
| Task start conditions | • Start by power is turned on. • Start by an interrupt from the programmable controller CPU. (Not possible when compiled BASIC is used.) • Start by a start request from another task. |
| Internal memory: Program | Maximum 64K bytes (Task 1 capacity + Task 2 capacity ≤ 64K bytes) |
| Internal memory: Common memory | 8K bytes |
| Internal memory: Buffer memory | 6K bytes |
| Internal memory: Expansion relay (EM) | 1024 points |
| Internal memory: Expansion register (ED) | 1024 points |
| General input/output | Input: 26 points Output: 23 points |
| Memory protection | Yes (Flash ROM write protectable) |
| Interface: CH1 | RS-232-compliance (D-sub 9 pin) |
| Interface: CH2 | RS-232-compliance (D-sub 9 pin) |
| Communication method | Full-duplex communications |
| Synchronization method | Start-stop synchronization method |
| Transmission speed | 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 28800, 38400 bps • Total transmission speed of two interfaces is available up to 38400 bps. |
| Transmission distance: RS-232 | Maximum 15 m |
| Data format: Start bits | 1 |
| Data format: Data bits | 7/8 |
| Data format: Parity bits | 1 (vertical parity) or none |
| Data format: Stop bits | 1/2 |
| Transmission control: RS-232: DTR/DSR control | Enabled |
| Transmission control: RS-232: RS/CS control | Enabled |
| Transmission control: RS-232: CD(DCD) signal control | Disabled |
| Transmission control: RS-232: DC1/DC3 (Xon/Xoff) controlDC2/DC4 control | Enabled |
| Transmission control: RS-232: DC2/DC4 control | Disabled |
| Line configuration of connection (External device side : CPU module side): RS-232 | 1:1 |
| Clock function | None |
| Power failure maintenance | None |
| User program ROM storage | The program area only can be stored in Flash ROM. |
| Console | DOS/V personal computer or PC-9800 Series |
| Multitask debugging | Possible (when the debugger is used) |
| Number of occupied I/O points | 32 points (I/O assignment: Intelligent 32 points) |
| Internal current consumption (5 V DC) | 0.26 A |
| External dimensions: Height | 98 mm |
| External dimensions: Width | 27.4 mm |
| External dimensions: Depth | 90 mm |
| Weight | 0.20 kg |
Specifications
| General specifications | Refer to the general specifications of the CPU module. |
Downloads & documentation
Official documents from Mitsubishi Electric (Factory Automation), downloaded directly from the manufacturer.
Data sheets & manuals
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