Mitsubishi MC413A-2 BN624A829G51 Spare for MELSEC-A Automation: Rapid Replacement & Downtime Risk Control
The Mitsubishi Electric MC413A-2 (part number BN624A829G51) is an original RAM memory cassette designed for the MELSEC-A Series programmable logic controller platform — one of the most widely deployed legacy PLC architectures in industrial automation. For maintenance engineers managing aging control systems, this memory cassette is a critical spare: it stores the ladder logic program and system parameters that govern machine operation. A failed or corrupted memory cassette can result in complete production stoppage, making verified stock availability a top priority in any spare parts strategy.
At SMARTNEXMSK, every MC413A-2 BN624A829G51 unit is sourced as an original Mitsubishi Electric component, individually inspected, and tested prior to shipment. We support maintenance teams and procurement engineers across manufacturing, automotive, food processing, chemical, and utilities sectors who depend on MELSEC-A systems for continuous operation.
Spare Maintenance Table
| Parameter | Specification / Detail |
|---|---|
| Part Number | MC413A-2 |
| Manufacturer Part No. | BN624A829G51 |
| Brand | Mitsubishi Electric |
| Series | MELSEC-A (A-Series PLC) |
| Module Type | RAM Memory Cassette |
| Function | Program storage for MELSEC-A CPU modules |
| Compatible CPU Modules | A2C, A2N, A3N, A2A, A3A, A2U, A3U and compatible A-Series CPUs |
| Origin | Japan |
| Condition | Original / Genuine Mitsubishi Electric |
| Installation | Direct cassette slot insertion on MELSEC-A CPU front panel |
| Application Environment | Industrial control panels, PLC racks, automation cabinets |
| Operating Temperature | 0°C to 55°C (standard industrial range) |
| Maintenance Note | Battery backup recommended; verify battery module (A6BAT or equivalent) during replacement |
| Pre-Shipment Testing | Yes — functional verification before dispatch |
| Warranty | 12 Months from date of shipment |
Maintenance Planning for Continuous Operation
When a maintenance or procurement engineer identifies the MC413A-2 BN624A829G51 as a required spare, the replacement event should be treated as a broader system health checkpoint — not an isolated component swap. MELSEC-A CPUs such as the A2NCPU, A3NCPU, or A2UCPU rely on a tightly integrated set of components, and a memory cassette failure often signals that adjacent parts are approaching end-of-life.
During a planned or emergency replacement of the MC413A-2, engineers should simultaneously inspect the A6BAT battery module, which provides RAM backup power. A depleted battery is the most common cause of program loss in MELSEC-A systems. The A1S62B or A1S68B base unit slot contacts should be cleaned and verified for secure cassette seating. If the CPU module itself — such as the A2NCPU or A3UCPU — shows fault indicators alongside the memory error, it may require parallel evaluation or staged replacement.
Power supply integrity is equally critical: the A1S61P or A61P power supply module should be checked for output voltage stability, as undervoltage conditions can corrupt RAM contents. On the I/O side, inspect A1SX40 input modules and A1SY10 output modules for contact wear or signal anomalies that may have contributed to the original fault condition. If the system uses a MELSECNET/B or CC-Link communication module (such as the A1SJ71BR11 or A1SJ61BT11), verify that network parameters stored in the memory cassette are correctly restored after replacement.
For control cabinets with HMI integration, confirm that the GOT1000 or GOT-A900 series HMI screen data and communication settings remain synchronized with the restored PLC program. Terminal blocks and wiring harnesses connected to the CPU rack should be inspected for corrosion or loose terminations, particularly in high-vibration or high-humidity environments. Maintaining a documented spare parts list that includes the MC413A-2, the A6BAT battery, and at least one CPU module variant ensures that your team can execute a full recovery within a single maintenance window.
Site Replacement Workflow
Step 1 — Pre-replacement backup: Before removing the MC413A-2, use GX Developer or GX Works2 to upload and save the current ladder program to a PC. This protects against data loss if the RAM contents are already partially corrupted.
Step 2 — Power-down and safe isolation: Follow your site LOTO (Lockout/Tagout) procedure. Confirm that the A-Series CPU is fully de-energized before opening the control cabinet.
Step 3 — Cassette removal and inspection: Remove the existing MC413A-2 from the CPU cassette slot. Inspect the slot contacts for oxidation or debris. Clean with appropriate contact cleaner if necessary.
Step 4 — New cassette installation: Insert the replacement MC413A-2 BN624A829G51 firmly into the cassette slot. Verify the locking tab is engaged. Confirm the A6BAT battery module is present and within its service life before restoring power.
Step 5 — Program download and verification: Power up the CPU and download the saved program using GX Developer or GX Works2. Verify program checksum, I/O assignments, and communication parameters. Run a controlled test cycle before returning the system to production.
Step 6 — Documentation: Record the replacement date, new part serial number, and battery status in your maintenance log. Schedule the next battery inspection within 12 months.
This workflow minimizes downtime, preserves system compatibility, and ensures that the MELSEC-A platform continues to operate reliably — even as the original hardware ages beyond its nominal service life.
Spare Parts Support FAQ
Q1: Is the MC413A-2 BN624A829G51 still available as a new original part?
Yes. SMARTNEXMSK maintains stock of original Mitsubishi Electric MC413A-2 units sourced through verified industrial supply channels. Each unit is inspected and tested before shipment. While the MELSEC-A platform is a legacy series, demand for genuine spare parts remains active among facilities running long-lifecycle automation systems.
Q2: How do I verify compatibility with my specific MELSEC-A CPU before ordering?
The MC413A-2 is compatible with a range of MELSEC-A CPU modules including the A2NCPU, A3NCPU, A2ACPU, A3ACPU, A2UCPU, and A3UCPU. If you are unsure of your CPU model, provide your CPU part number or cabinet nameplate details to our technical team at sales@smartnexmsk.com and we will confirm compatibility before processing your order.
Q3: What pre-shipment testing is performed on each unit?
Every MC413A-2 BN624A829G51 unit undergoes functional verification prior to dispatch. This includes physical inspection of the cassette housing and contacts, and confirmation that the unit meets original Mitsubishi Electric specifications. A test report is available upon request for quality-critical procurement processes.
Q4: What does the 12-month warranty cover, and how is a claim processed?
The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions. If a unit fails within the warranty period, contact sales@smartnexmsk.com with your order reference and a description of the fault. We will arrange a replacement or refund based on technical assessment. Warranty does not cover damage resulting from incorrect installation, overvoltage, or physical mishandling.
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