Black Box PLC vs PC-Based Automation (Real TCO Analysis)
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Architecture Comparison Framework
Separate PLC CPU + separate smart HMI + per-axis motion expansion + vendor-locked I/O + annual or version-based engineering/service costs.
PLC + HMI + Data Processing + Motion Control on a single industrial IPC. Modular I/O via EtherCAT, open-architecture software, and more transparent scaling.
Industrial IPC Layer
Fanless IPC architecture consolidates PLC, HMI, data acquisition, and high-level integration into one core.
IEC 61131-3 Software Freedom
Hardware-independent project structure reduces the risk of re-platforming during the machine lifecycle.
Modular EtherCAT I/O
Remote I/O architecture offers transparent costs and flexible layout for field expansions.
What is included in this model?
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1 Machine Scope and Comparison Horizon
For simple machines with low axis counts, a micro PLC may still make sense. But as axes, data processing, HMI complexity, and lifecycle grow, the TCO balance shifts to open architecture.
2 Traditional Black Box PLC Assumptions
You can get a more realistic TCO comparison by tweaking these assumptions based on the brand you currently use.
3 ONX PC-Based (SoftPLC) Assumptions
Because licensing and hardware are more transparent in open architecture, some items are auto-calculated. You can still adjust the I/O factor and service assumptions.
Engineering Note: What is the Real Value Here?
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4 Items Included / Excluded in this Model
- • PLC CPU / IPC main control hardware
- • HMI panel vs bare display panel delta
- • Motion expansion approach
- • Digital / Analog I/O cost
- • Seat-based software & annual service
- • Critical spare stock & lifecycle reserve
- • Servo drives and motors
- • Panel labor and field wiring
- • Special safety architectures
- • SQL / MQTT / MES integration scope
- • UPS, RAID, backup image policy
- • Application-specific CNC/Robotic add-ons
Multi-Year TCO Comparison
Summary Breakdown
Traditional Breakdown
ONX Breakdown
Frequently Asked Questions
Is PC-based control reliable in the factory?
When built with the right industrial IPC, proper storage, watchdog, image backup, and clean power, it can be highly reliable. The issue is not just "Does it run Windows?"; the real-time runtime engine, hardware selection, and service discipline must be evaluated together.
Why is 'TCO' more important in this analysis?
Because in automation architectures, the real delta is often not in the initial purchase price, but in the licensing, service, spare stock, maintenance, and re-engineering costs incurred over 3-5 years.
In what scenario is a micro PLC still logical?
For machines with 0-2 axes, low I/O, no need for database/MES/remote access/advanced visualization, and a relatively short lifecycle, the micro PLC approach can still be economical.