Mitsubishi PLC Parts NZ | FX3U FX5U FX2N Q Series MELSEC iQ-R

Mitsubishi Electric Parts, New Zealand

RFQ / Mitsubishi Electric

Mitsubishi packs a lot into single characters. R or T is relay or transistor, /ES or /DS is AC or DC supply, A or B is the servo interface, and S or F decides whether a memory card survives a flat battery.

Mitsubishi is on a great deal of imported machinery in New Zealand. FX and Q series PLCs, GOT terminals, FR inverters and MELSERVO drives.

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Reference pages

Page	Covers
MELSEC FX series	Left and right expansion, FX2N compatibility, memory cassettes and battery risk
MELSEC Q series	Base unit decode, power supply differences, QA bases and SRAM cards
GOT terminals	Model code decode, tier interfaces, the backup battery and protective sheets
FREQROL FR inverters	Voltage class decode, SC safety models, jumper traps and long-cable trips
MELSERVO MR-J	Interface letter, J3 to J4 migration, encoder batteries and the drive recorder

The single-character traps

Worth reading before ordering anything Mitsubishi.

Range	Character	What it decides
FX main unit	R or T	Relay or transistor output. Not interchangeable
FX main unit	/ES or /DS	AC or DC power supply
FX main unit	Extra S, /ESS	Source inputs only
FX module	-ADP	Left side adapter, not a right side block
FX network	Trailing M	Master rather than slave
Q base	Q5 or Q6	Whether a power supply module is required
Q memory card	S or F	SRAM or flash. Battery dependent or not
Q CPU	E	Built-in Ethernet
Q network	QJ71 or QJ72	Master or local, against remote station
GOT	Last letter, A or D	AC or DC power supply
GOT	F in the model	Open frame. Different mechanical fit
FR inverter	2 or 4	200 V or 400 V class
FR inverter	S	Single phase input
FR inverter	SC	Safety stop function model
MR-J servo	A, B, GF, TM	The control interface
MR-J motor	B	Electromagnetic brake

Where the program lives

Check this before ordering any Mitsubishi controller, because it decides whether a replacement is a swap or a commissioning job.

Platform	On a replacement
FX with a memory cassette	Move the cassette. The machine runs
FX without one	Program is in battery-backed RAM. Needs reloading
Q with a flash card	Survives a flat battery
Q with an SRAM card	Battery dependent
GOT	Arrives blank. Back up to SD from the terminal itself
FR inverter	Arrives at defaults. Copy parameters via USB or the panel
AM8000 equivalent, MR-J motor	Amplifier tunes itself with one-touch tuning

The FX memory cassette is worth fitting now

When a cassette is installed, the cassette's program is used in place of the internal RAM.

That does two things at once: a failed PLC becomes a swap, and the machine stops depending on its battery.

Fitting one to a running machine takes minutes. The FX3U-FLROM-64L even has program transfer buttons, so a program can be copied between PLCs with no PC and no software licence.

Batteries across the range

Mitsubishi batteries are consumables, and on several platforms losing one loses real data.

Platform	Battery	What is lost
FX3U	FX3U-32BL	The program, if there is no memory cassette
Q series	Q6BAT, Q7BAT	SRAM card contents and retained data
GOT2000	GT11-50BAT	SRAM data, clock, system status log
GOT1000	GT15-BAT	As above
MR-J servo	By generation	Absolute position. Machine needs re-homing

Batteries are cheap and the failures they cause are not. A site running Mitsubishi should hold a set.

The symptoms

Symptom	Check
Machine needs homing every start	Servo battery
GOT clock resets, logs disappear	GOT battery
PLC battery warning on the display	Act on it. Especially with no memory cassette

The migration paths

Mitsubishi is unusually good at letting old modules run on new systems. Worth asking about before quoting a rebuild.

From	To	Via
FX2N modules	FX3U main unit	Directly compatible
FX3 modules	FX5U main unit	FX5-CNV-BUS or FX5-CNV-BUSC
A and AnS modules	Q system	QA and QA1S base units
Q modules	iQ-R system	RQ extension bases
MR-J3 installation	MR-J4	Same cables and flange sizes. J3 compatibility mode

So an obsolete Mitsubishi system rarely needs replacing wholesale. The controller comes forward a generation and the I/O stays.

Tell us what you have and we will quote both the like-for-like and the staged route.

Programming software by generation

The thing that decides who can open a program.

Software	Covers
MEDOC	Earliest FX and A series
GX Developer	FX, A and Q series
GX Works2	FX and Q series
GX Works3	FX5 and iQ-R only
GT Designer3 (GOT2000)	GOT2000 terminals
GT Designer3 (GOT1000)	GOT1000 terminals
MR Configurator2	MELSERVO
FR Configurator2	FR inverters

GX Works3 does not open FX3U or Q series projects. A site that has moved to current tooling may find it cannot open its own older programs.

And the FX programming port is RS422. No modern laptop has one, so an FX-USB-AW converter is needed. It is worth having on the shelf before it is needed.

Before ordering a replacement

Checks that save a good proportion of unnecessary orders.

Symptom	Check first
Servo needs homing every start	The encoder battery
Servo trips intermittently	The drive recorder. The data is already in the drive
Inverter trips on overheat	The cooling fan. A separate part
Small 400 V inverter trips thermal	Motor cable length. Over 50 m causes nuisance trips
GOT touch response patchy	The protective sheet
GOT clock resetting	The battery
Far end I/O misbehaving after an extension	The extension power supply budget
Inverter reactor or resistor doing nothing	The jumpers. P/+ to P1, and PR to PX

What Mitsubishi makes

Range	Product
FX	MELSEC-F compact PLCs
Q, QnA, A, AnS	MELSEC modular PLCs
R	MELSEC iQ-R modular PLCs
L	MELSEC-L rackless PLCs
GT, GOT	Graphic operation terminals
FR	FREQROL inverters
MR-J, MR-JE	MELSERVO amplifiers
HG, HF, HC	Servo motors
AJ65	CC-Link remote I/O
NZ2	CC-Link IE modules
MELFA	Industrial robots
NF, WS, MS-T	Breakers, switches and contactors

We supply all of these. The pages above cover the ranges we see most often in New Zealand.

How to give us what we need

The full model number off the unit, including every suffix. On Mitsubishi the suffix usually is the specification.

Which side a module mounts on, for FX expansion.

The base unit number, for Q systems.

Whether you have the program, project file or parameter set.

A photo. Mitsubishi labels are on the front and usually legible, and one photo of a rack identifies the lot.

What we can supply

Current production. FX5U and FX5UC, iQ-R, GOT2000, FR-A800 and FR-F800, MR-J4 and MR-J5, CC-Link I/O. Quoted with a delivered lead time.

Discontinued. FX0N through FX3U, A, AnS and Q series, GOT1000 and older, FR-A500 and FR-E500, MR-J2S and MR-J3. Surplus and tested used, which keeps an existing machine on its original program.

Consumables and accessories. Batteries, memory cassettes, memory cards, protective sheets, cooling fans, programming interfaces, extension cables and connectors.

Converters and adapter bases. The FX5-CNV-BUS, QA bases and RQ bases that make a staged migration possible.

A sensible Mitsubishi spares holding

Four cheap items cover most of what goes wrong.

Item	Why
Batteries for every platform on site	Consumable, and the failures are expensive
An FX-USB-AW	Without it nobody can read a program off an FX
A memory cassette per FX machine	Turns a PLC failure into a swap
SD cards with GOT project backups	Turns a terminal failure into ten minutes

None of these are expensive and all of them are cheaper than the alternative.

We buy Mitsubishi

Mitsubishi hardware holds real value, because a like-for-like replacement avoids a program conversion and a control system change.

Keep matched sets together. Main units with their modules and memory cassettes, amplifiers with their motors and cables, terminals with their project backups. See Sell To Us.

Common questions

Can you get a part that is not listed on your site?
Usually. The site shows what we hold, not what we can source.

Can I fit an FX5U in place of an FX3U?
Physically yes, but the program needs converting and existing modules need an FX5-CNV-BUS.

Is MR the same as MT?
No. R is relay output and T is transistor. Different capabilities.

Can I use a Q55B instead of a Q65B?
Only if the rack has no power supply module in that position. They are different base types.

Do you supply used equipment?
Yes, where new is not available, tested and clearly described.

What is the lead time?
Ex stock items ship the next working day within New Zealand. We give you a firm lead time with the quote.

Do you quote in NZD?
Yes, in NZD including GST for New Zealand customers.

Send us your part numbers

Include every suffix. On Mitsubishi the suffix is usually the specification rather than a variant. Quotes in NZD including GST.

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Industech is an independent supplier of new, surplus and used industrial automation equipment. We are not an authorised distributor of, approved by, sanctioned by, or affiliated with Mitsubishi Electric. MELSEC, MELSERVO, MELFA, FREQROL, GOT, SSCNET, CC-Link, GX Works and GT Designer are trademarks of Mitsubishi Electric Corporation. All trademarks, brand names and part numbers are the property of their respective owners and are used here for identification purposes only.