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Mitsubishi Electric QD77MS4 — PLC I/O & Expansion Modules

Mitsubishi QD77MS4 Simple Motion Module, 4-Axis

MPNQD77MS4

Mitsubishi MELSEC Q Series, Simple Motion Module, QD77MS4, 4 axes, 0.88ms operation cycle, 32 I/O occupancy.

$1,315.00 – $1,513.97Ref. price · indicative, final on quote
Mitsubishi Electric QD77MS4 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

QD77MS4 — Specifications
ParameterValue
Weight0.16 Kg
Control unitmm, inch, degree, PLS
Product typeSimple Motion Module
Control methodPTP (Point To Point) control, path control (both linear and arc can be set), speed control, speed-position switching control, position-speed switching control, speed-torque control
Operation cycle0.88ms/1.77ms
Number of control axes4 axes
Flash ROM write count max.100000 times
Number of occupied i (O points [points])32 (I/O assignment: Intelligent function module 32 points)
Internal current consumption (5 v DC) [A]0.6

Product details

What This Module Does in a Q-Series Rack

The QD77MS4: Control units include mm, inch, degree, and PLS (pulse), so it interfaces with most servo drives that accept pulse-train or direction commands. Flash ROM stores parameters and can handle 100,000 write cycles before wearing out.

How It Stacks Up Against the FX5-80SSC-S

The FX5-80SSC-S is the closest functional cousin but sits in the iQ-F family. The QD77MS4 drives 4 axes from the Q backplane; the FX5 handles 8 axes and needs an external 24V supply. The QD77MS4 occupies 32 I/O points; the FX5 takes just 8. More important: they use different rack interfaces — you can't pull the FX5 and drop in the QD77MS4 without changing the PLC platform. Running both in a panel means separate power and addressing schemes.

Lifecycle is 'mature' — active in-production part. No phase-out or discontinuation.

Frequently asked questions

Can the QD77MS4 be used as a replacement for the FX5-80SSC-S?

No—the QD77MS4 is a MELSEC Q-series module and the FX5-80SSC-S is an iQ-F series module. They use different backplane interfaces, power supplies, and I/O occupancy. A panel wired for one cannot accept the other without a PLC platform change.

MPN
QD77MS4