Home / Mitsubishi Electric (Factory Automation) / Mitsubishi MELSEC iQ-R Series – Motion/positioning / RD77MS8 Mitsubishi MELSEC iQ-R Series Simple motion

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RD77MS8 Mitsubishi MELSEC iQ-R Series Simple motion

MPN: RD77MS8 · Brand: Mitsubishi Electric (Factory Automation)

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12-month warranty (new) · 3-month (used/refurbished)

30-day returns, no restocking fee on unused parts

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Quick facts

Availability	Confirmed on request
Category	Mitsubishi MELSEC iQ-R Series – Motion/positioning
Lifecycle	Active
Warranty	12-month (new) · 3-month (used/refurbished)

Shipping & availability

When can RD77MS8 be shipped?

RD77MS8 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 RD77MS8 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 RD77MS8 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 RD77MS8, subject to availability and destination.

The Mitsubishi Electric RD77MS8 is a simple motion in the MELSEC iQ-R Series. Maximum number of control axis: 8 axes, SSCNET III/H connection, Positioning control, synchronous control, speed-torque control, continuous operation to torque control. Specifications and manuals below are Mitsubishi Electric's own data.

Specifications

Product

Series	MELSEC iQ-R Series
Category	Simple motion
Type	SSCNETⅢ/H-compatible
Outline	Maximum number of control axis: 8 axes, SSCNET III/H connection, Positioning control, synchronous control, speed-torque control, continuous operation to torque control

Control specifications

Number of control axes	Up to 8 axes (virtual servo amplifier axis included)
Operation cycle (operation cycle settings) *1	0.444 ms, 0.888 ms, 1.777 ms, 3.555 ms
Interpolation function	Linear interpolation (up to 4 axes), 2-axis circular interpolation, helical interpolation (3 axes)
Control method	Positioning control, speed control, speed-torque control, speed-position switching control, fixed-pitch feed, advanced synchronous control, cam control, continuous path control, position-speed switching control
Acceleration/deceleration processing	Trapezoidal acceleration/deceleration, S-curve acceleration/deceleration
Compensation function	Backlash compensation, electronic gear, near pass function
Synchronous control	Synchronous encoder input, cam, phase compensation, cam auto-generation
Control unit	mm, inch, degree, pulse
Positioning control method	Motion profile table
Number of positioning data	600 data (positioning data No. 1 to 600)/axis (Can be set with MELSOFT GX Works3 or a sequence program.)
Backup	Parameters, positioning data, and block start data can be saved on flash ROM (batteryless backup)
Home position return	Proximity dog method, count method 1, count method 2, data set method, scale home position signal detection method (fast home position return control, home position return retry function, and home position shift function provided)
Positioning control	Linear interpolation control (up to 4 axes) *2 , fixed-pitch feed control (up to 4 axes), 2-axis circular interpolation (auxiliary point-specified, central point-specified), speed control (up to 4 axes), speed-position switching control (INC mode, ABS mode), position-speed switching control (INC mode), current value change
Manual control	JOG operation, inching operation, manual pulse generator operation (up to 1 module)
Speed-torque control	Speed control not including position loop, torque control, continuous operation to torque control
Synchronous encoder operation function	Possible to connect 4 modules (Total of the internal interface (incremental 1 channel), via PLC CPU interface, and servo amplifier interface)
Absolute position system	Provided (Made compatible by setting battery to servo amplifier.)
Speed limit	Speed limit value, JOG speed limit value
Torque limit function	Torque limit value same setting, torque limit value individual setting
Forced stop	Valid/invalid setting
Software stroke limit function	Movable range check with feed current value or with machine feed value
Hardware stroke limit function	Provided
Speed change	Provided
Override	0 to 300 %
Acceleration/deceleration processing change	Acceleration/deceleration time
Torque change function	Provided
Torque limit value change	Provided
Target position change function	Speed to a target position address and a target position is changeable.
M-code output function	Provided
Step function	Deceleration unit step, data No. unit step
Skip function	Via a PLC CPU or an external command signal
Teaching function	Provided
Parameter initialization function	Provided
External input signal setting function	Via an internal interface, a CPU (buffer memory), or a servo amplifier
Event history function	Provided
Amplifier-less operation function	Provided
Mark detection function	Continuous detection mode, specified number of detections mode, ring buffer mode
Mark detection function: Mark detection signal	Up to 20 points
Mark detection function: Mark detection setting	16 settings
Optional data monitor function	Up to 4 points/axis
Driver communication function	Provided
Connect/disconnect function of SSCNET communication	Provided
Digital oscilloscope function	Bit data: 16 channels, word data: 16 channels *4

Module specifications

Servo amplifier connection method	SSCNET III/H
Maximum distance between stations [m]	SSCNET III/H: 100
PERIPHERAL I/F	Via a CPU module (USB, Ethernet)
Number of occupied I/O points	32 points (I/O allocation: intelligent function module 32 points)
Number of module occupied slots	1
5 V DC internal current consumption [A]	1.0
Mass [kg]	0.23
Exterior dimensions [mm]	106.0 (H) x 27.8 (W) x 110.0 (D)

Downloads & documentation

Official documents from Mitsubishi Electric (Factory Automation), downloaded directly from the manufacturer.

Data sheets & manuals

MELSEC iQ-R Simple Motion Module User's Manual (Startup) (IB-0300245ENG-)	PDF · 7.07MB
MELSEC iQ-R Simple Motion Module User's Manual (Application) (IB-0300247ENG-L)	PDF · 14.65MB
MELSEC iQ-R Simple Motion Module User's Manual (Advanced Synchronous Control) (IB-0300249ENG-J)	PDF · 3.24MB
MELSEC iQ-R Simple Motion Module Function Block Reference (BCN-B62005-691ENG-F)	PDF · 0.91MB
PLCopen Motion Control Function Block Reference (BCN-B62005-757-H)	PDF · 2.08MB
RD77MS Before Using the Product (BCN-B62008-335E-F)	PDF · 0.16MB