Mitsubishi F1-12MR – Compact Relay Output Programmable Controller | MELSEC F Series
Engineering Background: The Mitsubishi MELSEC F Series represents one of the most enduring compact PLC platforms in industrial automation history. Introduced to address the need for reliable, cost-effective control in small-to-medium machinery, the F Series established a benchmark for ladder logic simplicity and robust I/O performance in demanding factory environments across Asia, Europe, and the Americas.
Product Positioning: The F1-12MR is a fixed-configuration, relay-output PLC base unit within the MELSEC F1 sub-series. With 12 total I/O points (6 inputs / 6 relay outputs), it is purpose-built for discrete control tasks in standalone machines, conveyor systems, and process interlocking applications where compactness and deterministic relay switching are paramount. This unit is a verified legacy component sourced for MRO (Maintenance, Repair & Operations) and system retrofit projects.
Complete Technical Specifications
| Part Number / SKU | F1-12MR |
| Manufacturer | Mitsubishi Electric Corporation |
| Series / Platform | MELSEC F Series (F1 Sub-Series) |
| Unit Type | Base Unit (Fixed I/O Configuration) |
| Total I/O Points | 12 Points (6 Inputs / 6 Outputs) |
| Output Type | Relay Output (MR designation) |
| Input Voltage | AC 100–240 V (±10%), 50/60 Hz |
| Input Signal Type | DC 24 V sink/source compatible |
| Output Rated Load | 2 A per point (resistive load), 80 VA max |
| Program Memory | 1,000 Steps (EEPROM) |
| Programming Language | Ladder Diagram (LD) |
| Scan Time | Approx. 0.5 ms / 1,000 steps |
| Internal Relay (M) | 256 Points |
| Timer (T) | 32 Points (100 ms / 10 ms resolution) |
| Counter (C) | 16 Points |
| Data Register (D) | 16 Points |
| Communication Port | RS-422 (F1 peripheral port) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -20 °C to +70 °C |
| Humidity | 35% to 85% RH (non-condensing) |
| Vibration Resistance | 10–55 Hz, 0.5 mm amplitude (IEC 60068-2-6) |
| Dimensions (W×H×D) | Approx. 130 × 90 × 75 mm |
| Weight | Approx. 1,340 g |
| Enclosure Rating | IP20 (panel-mount installation) |
| Certifications | CE, UL (original production standard) |
| Country of Origin | Japan |
Proven Application Environments
- Conveyor & Material Handling: Discrete start/stop sequencing with relay-driven motor contactors
- Packaging Machinery: Cycle-based interlocking, reject gate control, and sensor-triggered outputs
- Injection Molding Auxiliaries: Temperature interlock logic and mold-open/close sequencing
- HVAC & Building Automation: Fan/pump staging, alarm relay switching
- MRO & Legacy System Retrofit: Direct drop-in replacement for existing F1-12MR installations without re-engineering
- OEM Machine Control: Embedded in standalone machines requiring compact, self-contained PLC logic
Engineering Advantages
- Relay Output Isolation: Galvanically isolated relay contacts eliminate ground loop interference between PLC logic and field devices — critical in mixed AC/DC environments
- Universal AC Input: Wide-range 100–240 VAC power supply eliminates the need for external transformers in global deployments
- EEPROM Program Retention: Non-volatile memory retains ladder program without battery backup — zero maintenance for long-term installations
- Compact Fixed-I/O Form Factor: All-in-one base unit reduces panel space and wiring complexity versus modular alternatives
- RS-422 Peripheral Port: Supports F1 programming consoles (F1-20P) and HMI connectivity without additional communication modules
- Proven MTBF: Mitsubishi MELSEC F Series units are documented in service for 20+ years in continuous industrial operation
System Architecture & Signal Flow
The F1-12MR operates on a fixed scan-cycle architecture: Input Refresh → Program Execution → Output Refresh. The 6 DC input points (X0–X5) are optically isolated and accept 24 VDC signals from field sensors, pushbuttons, or limit switches. The 6 relay output points (Y0–Y5) drive external loads up to 2 A per contact, supporting AC or DC loads on independent circuits. The RS-422 port connects to the F1 programming console or upstream SCADA/HMI via Mitsubishi’s F1 protocol. Program storage in EEPROM ensures deterministic restart behavior after power cycling — no initialization delay.
Sourcing & Quality Verification
- Source: Procured from verified industrial surplus channels and authorized regional distributors with documented chain of custody
- Inspection Standard: Each unit undergoes visual inspection (connector integrity, label legibility, housing condition) and functional power-on verification prior to listing
- Authenticity: All units carry original Mitsubishi Electric production markings; counterfeit screening applied per Konmask internal QC protocol
- Condition: New-old-stock (NOS) or refurbished-to-spec; condition grade disclosed per order confirmation
- Warranty: 90-day operational warranty against DOA and latent defects; RMA process available
Procurement Process
- Inquiry: Submit your BOM or part number via email to support@konmask.com or WhatsApp +0086 19859288691
- Quote & Lead Time: Receive a formal quotation with stock confirmation within 1 business day
- Order Confirmation: Pro-forma invoice issued; payment via T/T, PayPal, or credit card
- Inspection & Dispatch: Unit re-inspected, photographed, and packed in anti-static ESD packaging with foam cushioning
- Shipping: DHL / FedEx / UPS express worldwide; tracking number provided within 24 hours of dispatch
- After-Sales: Technical support available for integration questions; warranty claims processed within 5 business days
Technical FAQ
Q: Is the F1-12MR compatible with GX Developer or GX Works2 programming software?
A: No. The F1-12MR uses the legacy F1 peripheral protocol and requires the F1-20P handheld programmer or the older SW0-F1C programming software. It is not compatible with GX Developer or GX Works2.
Q: Can the F1-12MR be expanded with additional I/O modules?
A: The F1-12MR is a fixed-configuration base unit and does not support expansion modules. For expandable configurations, consider the Mitsubishi F2 or FX Series.
Q: What is the relay contact life expectancy?
A: Mitsubishi specifies a mechanical life of 10 million operations and an electrical life of 100,000 operations at rated load (2 A resistive). For high-cycle applications, transistor output variants (F1-12MT) are recommended.
Q: Is a battery required for program retention?
A: No. The F1-12MR stores its ladder program in EEPROM, which is non-volatile and does not require a battery. Data registers may lose values on power loss unless latched in program logic.
Q: Can Konmask provide a test report or functional verification certificate?
A: Yes. A functional verification report (power-on test, I/O check) can be provided upon request at no additional charge for orders of 1+ unit.
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