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Manufacturing · head to head

ABB 800xA vs Siemens WinCC Unified

ABB 800xA logo

ABB 800xA

Manufacturing

Distributed control system and process automation platform for continuous and hybrid process plants

From
On request
Rated
-
Full reviewWebsite
Siemens WinCC Unified logo

Siemens WinCC Unified

Manufacturing

Siemens web-based HMI and SCADA platform, licensed by PowerTag count inside TIA Portal

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: ABB 800xA licensing is by I/O count, controller count and workplace clients, and none of it is published, so two plants of similar size can be quoted very differently with no external benchmark to argue against.; Siemens WinCC Unified licensing counts PowerTags, and archived tags are licensed separately from displayed tags, so a project that adds historian logging late can breach a tier and trigger an unbudgeted step-up purchase.
  • They diverge on capability: ABB 800xA covers Extended Automation, Siemens WinCC Unified covers TIA Portal engineering.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which ABB 800xA and Siemens WinCC Unified actually diverge.

Attributes where ABB 800xA and Siemens WinCC Unified differ
AttributeABB 800xASiemens WinCC Unified
PlatformsWindowsWindows, Web, Linux

Identical on both: starting price (On request), pricing model (quote), free tier (No), user rating (Not yet rated), category (Manufacturing).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in ABB 800xA

  • Extended Automation
  • AC 800M controllers
  • Connectivity servers
  • Safety integration
  • IEC 61850 electrical
  • Batch management
  • Information management
  • Asset optimisation

Only in Siemens WinCC Unified

  • TIA Portal engineering
  • HTML5 runtime
  • PowerTag licensing tiers
  • Unified Comfort Panels
  • Parameter Control
  • Performance Insight
  • JavaScript scripting
  • OPC UA server and client

What people use each for

The jobs each tool is most often brought in to do.

ABB 800xA

  • A refinery replacing operator consoles and control room infrastructure while keeping working field controllers in placenot Siemens WinCC Unified
  • A pulp and paper mill consolidating process, electrical and safety monitoring into a single operator workplacenot Siemens WinCC Unified
  • A mining operation that needs SIL 3 safety functions on the same network as process control rather than a separate safety systemnot Siemens WinCC Unified
  • A marine or offshore platform where ABB already supplies the electrical distribution and IEC 61850 integration removes a second systemnot Siemens WinCC Unified

Siemens WinCC Unified

  • A machine builder standardising on S7-1500 who wants HMI screens engineered in the same project as the PLC codenot ABB 800xA
  • Replacing a WinCC V7 plant SCADA before the 2027 support cut-off without changing controller vendornot ABB 800xA
  • A line supervisory system where operators and supervisors need browser access from tablets with no client software rolloutnot ABB 800xA
  • A plant already committed to the TIA Portal toolchain, where the cost of a rival SCADA is the second engineering environment and the second set of skills rather than the licencenot ABB 800xA

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

ABB 800xA

  • Licensing is by I/O count, controller count and workplace clients, and none of it is published, so two plants of similar size can be quoted very differently with no external benchmark to argue against.
  • Engineering and commissioning typically cost more than the software and controller hardware together, and that share is not visible in the initial ABB quotation, which prices the system rather than the project.
  • It is Windows only for servers and workplaces, so the operating system lifecycle drives forced upgrade cycles that have nothing to do with your process.
  • Once configured, the aspect object model and the specific integrator conventions used make handing the system to a different service provider expensive; ABB service contracts are effectively sticky.
  • Software maintenance is an annual contract on top of the licence and lapsing it means you cannot take version upgrades, so the system quietly ages out of security support if the plant skips renewals to save money.

Siemens WinCC Unified

  • Licensing counts PowerTags, and archived tags are licensed separately from displayed tags, so a project that adds historian logging late can breach a tier and trigger an unbudgeted step-up purchase.
  • There is no migration tool that converts a WinCC V7 project to Unified, so leaving the classic line before its 2027 support end means rebuilding screens, scripts and alarm configuration by hand.
  • Scripting moved from VBScript to JavaScript, which invalidates the script libraries in-house engineers accumulated over a decade on classic WinCC.
  • It is effectively bound to the Siemens controller stack; connecting Rockwell or Mitsubishi PLCs works through OPC UA but loses the shared tag database that is the main reason to buy it.
  • Three unrelated products share the WinCC name, and buyers who specify WinCC without saying Unified, V7 or OA regularly receive quotes for the wrong platform with different licensing and a different contractor pool.

Pricing, plan by plan

ABB 800xA

On request
  • ABB Ability System 800xA$undefined/year
    • Licensed by I/O count, controller count and workplace clients
    • Sold as a project through ABB or a certified partner
    • Annual software maintenance contract priced separately

Siemens WinCC Unified

On request
  • WinCC Unified$undefined/year
    • Engineering licence per seat within TIA Portal
    • Runtime licensed in PowerTag tiers, from 100 tags to unlimited
    • Archived tags licensed separately from displayed process tags

Which should you pick?

Choose ABB 800xA if

  • You need extended automation.
  • You work on Windows.
  • You also want ac 800m controllers.
ABB 800xA review

Choose Siemens WinCC Unified if

  • You need tia portal engineering.
  • You work on Windows, Web, Linux.
  • You also want html5 runtime.
Siemens WinCC Unified review

Questions people ask

Is ABB 800xA or Siemens WinCC Unified better?
Neither clearly leads. ABB 800xA starts at On request and Siemens WinCC Unified at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, ABB 800xA or Siemens WinCC Unified?
ABB 800xA starts at On request and Siemens WinCC Unified at On request.
Does ABB 800xA or Siemens WinCC Unified run on more platforms?
ABB 800xA runs on Windows. Siemens WinCC Unified runs on Windows, Web, Linux.
What is ABB 800xA best used for?
ABB 800xA is most often used for a refinery replacing operator consoles and control room infrastructure while keeping working field controllers in place, a pulp and paper mill consolidating process, electrical and safety monitoring into a single operator workplace, a mining operation that needs sil 3 safety functions on the same network as process control rather than a separate safety system, a marine or offshore platform where abb already supplies the electrical distribution and iec 61850 integration removes a second system. Of those, a refinery replacing operator consoles and control room infrastructure while keeping working field controllers in place and a pulp and paper mill consolidating process, electrical and safety monitoring into a single operator workplace are not what Siemens WinCC Unified is typically brought in for.
What can ABB 800xA do that Siemens WinCC Unified cannot?
ABB 800xA covers Extended Automation, AC 800M controllers, Connectivity servers, Safety integration. Siemens WinCC Unified covers TIA Portal engineering, HTML5 runtime, PowerTag licensing tiers, Unified Comfort Panels.

Answered from the vendors’ own pages

ABB 800xA: Is 800xA sold as a perpetual licence?

Yes, the system licence is perpetual, but a separate annual software maintenance agreement is required to receive updates and version upgrades.

Siemens WinCC Unified: Should I buy WinCC Unified or WinCC V7?

Unified, for any new project. V7 and V8 receive no new features and support ends in 2027.

ABB 800xA: Can 800xA control non-ABB field hardware?

Yes. Connectivity servers front third-party PLC and DCS systems and legacy ABB families, which is the main reason it wins brownfield projects.

Siemens WinCC Unified: Is WinCC OA the same product?

No. WinCC OA came from ETM, has its own engineering environment and licensing, and is aimed at very large distributed systems. It shares only the brand.

ABB 800xA: Does it replace a separate electrical SCADA?

It can. IEC 61850 substation integration is native, so many plants drop a separate electrical monitoring system.

Siemens WinCC Unified: What is a PowerTag?

An externally connected process variable in the runtime. Internal tags do not count, but archived tags are licensed separately from displayed ones.

ABB 800xA: What is the realistic implementation timeline?

A full plant migration is measured in years, not months; phased cutovers of one unit at a time are the norm.

Siemens WinCC Unified: Can operators use it from a browser without installing anything?

Yes, the runtime is HTML5, but concurrent browser clients need WebUX or Unified client licences.

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