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Ignition vs FactoryTalk vs WinCC vs AVEVA: Choosing HMI and SCADA Software
Choose HMI and SCADA software on four factors: how it is licensed as the system grows, whether it talks natively to your controllers, how it is deployed and backed up, and who in your plant will maintain it. Ignition suits mixed-vendor plants that expect growth; FactoryTalk and WinCC fit plants standardized on Rockwell or Siemens; AVEVA suits large multi-site process operations.
Published · Last reviewed by Geek Engineering senior engineering review.
HMI versus SCADA
An HMI is the operator screen for one machine or cell. SCADA supervises many machines or a whole process: it collects data from multiple controllers, raises alarms, stores trends and lets operators act from a central point. Most packages do both, and the same software often runs a panel-mounted HMI and a control-room SCADA system.
The main packages compared
| Software | Licensing model | Strongest fit | Watch for |
|---|---|---|---|
| Inductive Automation Ignition | Per server, with unlimited tags, clients and screens | Mixed-vendor plants, growth, web and mobile clients | Needs in-house or partner skill in its scripting and architecture |
| Rockwell FactoryTalk View and FactoryTalk Optix | Per station and per client, by size | Plants standardized on Allen-Bradley | Licence count rises with every added client and tag tier |
| Siemens WinCC (Unified, Professional, WinCC OA) | By tag count and client | Plants standardized on Siemens, TIA Portal projects | Several WinCC products with different scopes; confirm which one is quoted |
| AVEVA (System Platform, InTouch) | By tag count and component | Large process and multi-site operations | Architecture and licensing are powerful but complex to size |
A method for choosing
- List the controllers the system must talk to, and check each package's native drivers for them.
- Estimate tags and client screens today and in five years, and price each package at both sizes.
- Decide where it runs: on plant servers, virtual machines, or with cloud access, and how it is backed up and restored.
- Decide who maintains it. A package nobody in the plant can edit becomes a support contract by default.
- Set an HMI style standard, using a high-performance HMI approach such as ISA-101, before screens are built, so every project looks and behaves the same.
When to migrate an existing SCADA system
Migrating is justified when the current system runs on an unsupported operating system, cannot be patched, cannot connect to the data you now need, or costs more to license and maintain than a replacement. A migration is the right moment to rationalize tags, fix alarm floods and adopt a screen standard. Moving the same bad screens to new software wastes most of the benefit.
Key takeaways
- Price SCADA at today's size and at the size you expect in five years.
- Native drivers for your controllers matter more than feature lists.
- Decide who maintains it before buying.
- Use a migration to fix alarms and screens, not just to move them.
Related questions
Is Ignition better than FactoryTalk?
It depends on the plant. Ignition's per-server licensing and vendor-neutral drivers suit mixed and growing systems; FactoryTalk integrates tightly with Allen-Bradley controllers and is familiar to many Rockwell-trained technicians. Compare total licence cost at your expected size and the skills already on site.
What is a high-performance HMI?
A high-performance HMI uses muted graphics and reserves color for abnormal conditions, so operators notice problems quickly. ISA-101 is the standard that describes the approach to HMI design and lifecycle management.
Can SCADA software connect to an ERP or MES?
Yes, usually through database connections, OPC UA, MQTT or REST interfaces. The integration should be designed around which system owns each piece of data, so orders, recipes and results are not edited in two places.
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