How Big Is a Robot Controller? Cabinet Sizes from 8 kg to 200 kg
Every robot layout budgets the arm's swept circle and forgets the cabinet that drives it. Compiled from manufacturers' own published figures, robot control cabinets run from 0.09 to 0.41 square metres of floor and from 8.3 kg to 200 kg, and a single controller name can cover both ends of that range.
Every robot layout starts by sizing the arm. You take the reach, you square it, and you draw the swept circle the way our floor-space guide sets out. Then the machine arrives with a second object nobody drew, which is the control cabinet. Compiled from what manufacturers actually publish, robot controllers run from 0.09 to 0.41 square metres of floor and from 8.3 kg to 200 kg. That is a 4.3x spread in footprint and a 24x spread in mass. Worse for planning purposes, one controller product name can cover both ends of that range.
What manufacturers actually publish
There is no cross-brand table for this anywhere, because each manufacturer publishes its own cabinet on its own site and nobody compiles them. Below is that compilation. Every figure comes from the manufacturer’s own product page or datasheet, converted to a common width by depth by height order so the columns compare. The footprint column is the floor tile the cabinet occupies, width times depth, and nothing else.
| Brand | Controller | W x D x H (mm) | Floor footprint (m²) | Mass (kg) |
|---|---|---|---|---|
| FANUC | R-30iB Plus B-Cabinet | 740 x 550 x 1,100 | 0.41 | 180-200 |
| FANUC | R-30iB Plus A-Cabinet | 600 x 470 x 500 | 0.28 | 120-140 |
| Comau | R1C rack unit | 427 x 498 x 266 | 0.21 | 23 |
| FANUC | R-30iB Plus Mate, standard | 470 x 322 x 400 | 0.15 | 40 |
| FANUC | R-30iB Plus Mate, open-air | 370 x 350 x 200 | 0.13 | 20 |
| Universal Robots | Standard Control Box | 462 x 254 x 449 | 0.12 | 12* |
| FANUC | R-30iB Compact Plus | 440 x 260 x 85.5 | 0.11 | 9 |
| FANUC | R-30iB Mini Plus | 410 x 277 x 370 | 0.11 | 20 |
| Kawasaki | F60 | 300 x 320 x 130 | 0.10 | 8.3 |
| KUKA | Sunrise Cabinet | 500 x 190 x 483 | 0.10 | 23 |
| Universal Robots | OEM Control Box | 499 x 190 x 199 | 0.09 | not published |
Dimensions as published by each manufacturer, reordered to width x depth x height. FANUC figures from its R-30iB Plus controller datasheet; FANUC notes the two Mate variants change dimension with robot type (470 x 402 x 400 and 370 x 350 x 356 respectively). KUKA states 500 x 483 x 190 as W x H x D; Comau states 266 x 427 x 498 as H x W x D. UR’s standard box depth grows to 298 mm with the teach pendant mounted on the front. *UR control box mass is not on that page; 12 kg is the figure carried on all nine Universal Robots models in the Industrial Robotics Hub database. Footprint = width x depth, calculated here, not published.
Charted as floor tiles, the spread is easier to feel than to read:
Floor footprint (width x depth) of eleven robot control cabinets, computed from manufacturers’ published dimensions. The largest occupies 4.3 times the floor of the smallest.
One controller name is not one cabinet
The single most useful thing in that table is that six of the eleven rows are FANUC, and all six sit under one controller family.
FANUC’s own R-30iB Plus datasheet puts them side by side: a 9 kg Compact Plus at 440 x 260 x 85.5 mm, a 20 kg Mini Plus, a 20 kg open-air Mate, a 40 kg standard Mate, a 120 to 140 kg A-Cabinet, and a 180 to 200 kg B-Cabinet standing 1,100 mm tall. End to end that is 22 times the mass, 46 times the enclosed volume and 12.9 times the height, all under one product name.
Our own data shows why. Of the 355 robots in the Industrial Robotics Hub database, 231 (65.1%) publish a controller model, across 54 distinct strings. Eleven of those robots list plain “R-30iB Plus,” and they run from the FANUC M-3iA at 6 kg payload to the M-2000iA/1700L at 1,700 kg. A controller that has to drive a 6 kg delta and a 1,700 kg press-loader is not going to be the same box in both cases, because the servo amplifiers and the cooling scale with the arm, not with the software.
This is the cabinet-sized version of a pattern we have measured twice before: the controller platform name tells you the software generation, and the product series name tells you the design family. Neither is a physical specification. On a quote, “R-30iB Plus” is not a cabinet. Ask for the cabinet designation.
At the small end, the controller does not need floor at all
Five of the eleven entries are not floor-standing cabinets in the first place, and this is the cheapest floor space in a robot cell if you ask for it early.
Comau’s R1C is described by Comau as a 19-inch industrial rack control unit, occupying six rack units, with a published requirement that a minimum of one rack unit sits between two control units installed in the same cabinet. KUKA’s Sunrise Cabinet, the controller for the LBR iiwa, states it can be installed in a 19-inch rack or as a stand-alone device. Kawasaki’s F60, which in our database drives the RS007L and RS013N, was designed for stacking and 19-inch rack installation and weighs 8.3 kg, light enough for one person to carry. Yaskawa says its YRC1000micro can be installed horizontally, vertically or in a rack. And Universal Robots publishes an OEM control box that ships without a cabinet at all, for integrators building the controller into their own machine frame.
If your cell is floor-constrained, that is the question to put to the vendor before the layout is drawn, not after: is there a rack-mount or OEM variant of this controller, and what does it cost. It moves a whole floor tile into a cabinet you already have.
The compact ones buy their size back in ingress rating
There is a trade here, and it is worth naming before somebody bolts a rack unit to a wall in a machining shop.
KUKA lists the Sunrise Cabinet at IP 20. Comau lists the R1C at IP 2x. FANUC lists IP54 for its enclosed cabinets and IP20 for the open-air and Compact Plus types, and the R-30iB Plus Mate open-air variant is explicitly documented as an open-air design that must be installed in a pollution degree 2 environment as defined by IEC 60664-1.
IP20 means finger-safe and nothing else. No dust protection, no water protection. A cabinet at that rating has to live in a clean, dry, enclosed space, which in practice means inside an electrical enclosure or a control room, not standing next to a machine tool venting coolant mist. That is the same logic that governs ingress ratings on the arm itself, applied to a box that people tend not to think of as being in the process environment. The IP54 floor-standing cabinets can take a shop-floor position. The compact ones usually cannot, and the enclosure you put them in has its own footprint.
What is not published, and why that matters
Two of the four largest robot brands do not put these numbers on the page.
ABB’s OmniCore C30 product page carries no cabinet dimensions and no weight; the physical figures sit in ABB’s downloadable product specification for the OmniCore C line, document 3HAC065034, rather than on the web page. Yaskawa’s YRC1000 and YRC1000micro pages describe both as compact and rack-friendly but publish no dimensions either. Between them, ABB and Yaskawa account for 57 of the 231 robots in our database that name a controller, the two largest blocks of any brand, so this is not a marginal gap.
We have the same gap on our side and it is worth stating plainly rather than filling in. The Industrial Robotics Hub database carries no cabinet dimension field at all, and the one physical controller field it has, controller mass, is populated on 10 of 355 robots (2.8%). That is nine Universal Robots models at 12 kg and one Kawasaki RS015X at 40 kg. Where a spec is not published, our robot pages render a dash rather than an estimate, and this article works the same way.
Putting the cabinet into the floor budget
Set against the arm, the cabinet is small. A median cobot cell sweeps about 3.1 square metres and a median palletizer about 31, so a 0.12 square metre control box is roughly 4% of the first and under half a percent of the second. The reason it still causes trouble is not area, it is position and access.
Three things decide where the cabinet actually goes:
- It belongs outside the fence. An operator needs the teach pendant, the main disconnect and the door. Inside a guarded cell, every one of those becomes a cell entry with the associated interlock cycle. Put the cabinet tile against the fence line, not inside the swept circle.
- The published footprint is not the reserved footprint. A hinged door needs its swing, an open-air unit needs its airflow path, and the arm and mains cables need their bend radius behind the box. Comau’s published rule that two rack-mounted control units need a minimum one rack unit between them is the same idea expressed vertically.
- The depth figure may not include the pendant. Universal Robots publishes 253.7 mm depth for the standard control box and 298 mm with the teach pendant mounted on the front, a 44 mm difference that is entirely real when the box is against a wall in an aisle.
The order that avoids all of this is short. Size the arm’s swept circle first, get the exact cabinet designation into the quote next, ask whether a rack-mount variant exists, check the ingress rating against where you intend to stand it, and only then draw the tile. The same sequence applies to how the arm itself is mounted and to what the electrical supply has to be, which are the other two facility questions that arrive after the robot is already chosen.
Frequently asked questions
How much floor space does a robot controller cabinet need? +
Across the eleven controller variants whose manufacturers publish dimensions, the floor footprint runs from 0.09 square metres (Universal Robots' OEM control box, 499 x 190 mm) to 0.41 square metres (FANUC's R-30iB Plus B-Cabinet, 740 x 550 mm). That is a 4.3x spread in footprint and a 24x spread in mass, from 8.3 kg to 200 kg. Most controllers for arms under about 50 kg payload land between 0.09 and 0.15 square metres, roughly the floor of a small filing cabinet.
Does the controller sit inside or outside the robot's safety fence? +
Almost always outside, and that is the part layouts get wrong. The cabinet needs an operator in front of it for the teach pendant, the disconnect and the door, so putting it inside a guarded cell means every controller interaction becomes a cell entry. Plan the cabinet's floor tile next to the fence line rather than inside the swept circle you calculated for the arm, and remember it needs its own door swing and cable bend radius on top of the footprint.
Can a robot controller be mounted in a 19-inch rack instead of standing on the floor? +
Several can, and at the small end that is the intended installation. Comau's R1C is explicitly a 19-inch rack control unit occupying six rack units, KUKA's Sunrise Cabinet can be fitted in a 19-inch rack or run stand-alone, Kawasaki's F60 is designed for stacking or 19-inch rack mounting, and Yaskawa's YRC1000micro can be installed horizontally, vertically or in a rack. Universal Robots also sells an OEM control box supplied without a cabinet so integrators can build it into the machine frame. If floor is the constraint, ask the vendor for the rack-mountable variant before you accept a floor-standing cabinet.
Why do two robots with the same controller name have different cabinet sizes? +
Because the controller name describes an electronics generation, not a box. FANUC's own R-30iB Plus datasheet lists six physical cabinets under that one product family, from a 9 kg Compact Plus rack unit at 440 x 260 x 85.5 mm up to a 180 to 200 kg B-Cabinet at 740 x 550 x 1,100 mm. Which one arrives depends on the arm it drives, since bigger arms need bigger servo amplifiers and more cooling. Get the cabinet part number written into the quote, not just the controller family name.
Do all robot manufacturers publish their controller cabinet dimensions? +
No, and that is why this comparison is hard to find. FANUC, KUKA, Comau, Kawasaki and Universal Robots publish width, depth and height on their own public pages or datasheets. ABB's OmniCore C30 product page carries no dimensions or weight, and Yaskawa's YRC1000 and YRC1000micro product pages carry none either; both put the figures in downloadable product specifications instead. If a cabinet dimension is missing from the web page, ask for the product specification document by number before you draw the layout.
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