Mitsubishi MELSEC RD77MS16 Simple Motion Module | Replacement, Equivalent & Selection Guide
The Mitsubishi Electric MELSEC RD77MS16 is a high-performance 16-axis Simple Motion Module designed for the iQ-R Series PLC platform. As an authorized sourcing partner, Konmask.com provides genuine RD77MS16 units along with expert selection guidance for compatible replacements and equivalent alternatives.
Technical Specifications
- Model: RD77MS16
- Series: MELSEC iQ-R
- Manufacturer: Mitsubishi Electric
- Controlled Axes: Up to 16 axes
- Motion Control Type: Simple Motion (positioning)
- Communication Interface: SSCNETIII/H (high-speed optical network)
- Max. Positioning Points: 600 points per axis
- Interpolation: Linear (2–4 axes), Circular (2 axes)
- Speed Control: Supported
- Synchronous Control: Supported (cam, gear, phase)
- I/O Occupancy: 32 points (16 input / 16 output)
- Power Consumption: 5 VDC internal bus
- Operating Temperature: 0 – 55 °C
- Weight: Approx. 0.26 kg
- Compliance: CE, UL, cUL
Compatible Replacement & Equivalent Models
When the RD77MS16 is unavailable or under evaluation, the following models may serve as direct or functional replacements depending on your system configuration:
- RD77MS8 – 8-axis variant; same iQ-R platform, reduced axis count
- RD77MS4 – 4-axis variant; suitable for smaller motion systems
- RD77MS2 – 2-axis entry-level variant
- QD77MS16 – MELSEC-Q Series equivalent (16-axis); requires Q-series base unit
- LD77MS16 – MELSEC-L Series equivalent; compact form factor
- MR-J4 + RD77MS16 combo – Recommended servo amplifier pairing for full SSCNETIII/H topology
Note: Always verify firmware version, base unit compatibility, and SSCNETIII/H cable length before substituting models.
Why Choose the Original RD77MS16
- Native integration with Mitsubishi iQ-R CPU modules (R04CPU, R08CPU, R16CPU, R32CPU, R120CPU)
- Full GX Works3 programming environment support with Motion SFC and structured ladder
- SSCNETIII/H optical communication eliminates EMI interference in demanding industrial environments
- Synchronous control functions (electronic cam, gear, phase) not available on all equivalents
- Mitsubishi global warranty and long-term parts availability
- Seamless iQ-R system diagnostics via GX Works3 and GOT HMI
Typical Applications
- CNC machine tools and machining centers
- Semiconductor wafer handling and inspection equipment
- Packaging and labeling machinery
- Printing and converting lines
- Robotic arm coordination and gantry systems
- Electronic assembly and pick-and-place systems
- Textile and winding machinery
System Compatibility
- Base Unit: MELSEC iQ-R Series main base (R3□B) or extension base
- CPU Modules: R04CPU / R08CPU / R16CPU / R32CPU / R120CPU
- Servo Amplifiers: MR-J4-B, MR-J5-B (SSCNETIII/H compatible)
- Programming Software: GX Works3 (Ver. 1.015R or later recommended)
- HMI: GOT2000 Series (GT27, GT25, GT23)
- Network: CC-Link IE Field, SSCNETIII/H optical fiber
Selection Guide
Use the table below to select the correct Simple Motion Module for your axis count and platform:
- 2 axes, iQ-R: RD77MS2
- 4 axes, iQ-R: RD77MS4
- 8 axes, iQ-R: RD77MS8
- 16 axes, iQ-R: RD77MS16 ✓ (this model)
- 16 axes, Q-Series: QD77MS16
- 16 axes, L-Series: LD77MS16
If your application requires more than 16 axes, consider multi-module configurations or upgrading to the MELSEC iQ-R Motion CPU (R16MTCPU / R32MTCPU) for advanced multi-axis synchronization.
Quality Assurance & Sourcing
- All RD77MS16 units sourced through authorized Mitsubishi Electric distribution channels
- Pre-shipment inspection: visual, functional, and firmware version verification
- Anti-static packaging with humidity indicator cards
- Traceability documentation available upon request
- Counterfeit-free guarantee — Konmask.com does not deal in gray-market or refurbished units without disclosure
How to Order
- Step 1: Confirm your iQ-R CPU model and base unit slot availability
- Step 2: Verify required axis count (RD77MS2 / MS4 / MS8 / MS16)
- Step 3: Contact Konmask.com with your PO or inquiry — we respond within 1 business day
- Step 4: Receive quotation with lead time, warranty terms, and shipping options
- Email: support@konmask.com
- Phone/WhatsApp: +0086 19859288691
Replacement & Compatibility FAQ
Q: Can I replace an RD77MS16 with a QD77MS16?
A: Not directly. The QD77MS16 is designed for the MELSEC-Q Series base unit and is not physically or electrically compatible with the iQ-R backplane.
Q: Is the RD77MS16 compatible with MR-J3 servo amplifiers?
A: No. The RD77MS16 uses SSCNETIII/H, which requires MR-J4-B or MR-J5-B amplifiers. MR-J3 uses SSCNETIII (without /H) and is not compatible.
Q: Can I use multiple RD77MS16 modules in one iQ-R system?
A: Yes, subject to CPU module slot limits and total axis count constraints. Consult GX Works3 system configuration for slot assignment rules.
Q: What is the difference between RD77MS16 and R16MTCPU?
A: The RD77MS16 is a Simple Motion Module (positioning-focused), while the R16MTCPU is a dedicated Motion CPU with advanced synchronous control, higher axis counts, and independent processing. Choose R16MTCPU for complex multi-axis synchronization applications.
Q: Does Konmask.com offer technical support for integration?
A: Yes. Our engineering team can assist with GX Works3 parameter setup, SSCNETIII/H wiring, and servo tuning guidance.
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Contact: support@konmask.com | +0086 19859288691
