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PLC & control
Siemens S7-300/400H/1200/1500, Allen-Bradley ControlLogix and CompactLogix, GE PAC RX3i and 90-30, Schneider Momentum and TSX, Mitsubishi and Delta. Full IEC 61131-3: LD, FBD, ST, SFC, CFC.
Industrial automation · OT cybersecurity
Precision. Logic. Secure.
I'm Jair Vargas, an electronics engineer with 15 years designing, programming and securing the control systems that keep industry running — from the PLC and the SCADA down to the fieldbus and OT network monitoring.
15+
years on the plant floor
35
free tools
1.4M+
YouTube views
2
plants in production
Line 1 · S7-400HRUN
Profibus DP network0 faults
iFIX SCADA1,842 tags
Guardian P5503 alerts
What I work on
Four fronts that almost always show up together in a real plant project.
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HMI & SCADA
iFIX, WinCC, InTouch, FactoryTalk View and Cimplicity. Version migrations, Historian, SQL reporting, local and remote OPC integration, role-based access.
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Industrial networks
Profibus DP/PA (certified engineer), Profinet, AS-i, Modbus RTU/TCP, EtherNet/IP, ControlNet, DeviceNet, HART, Foundation Fieldbus and redundant fibre rings.
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OT cybersecurity
Nozomi Guardian P550 monitoring in production: asset inventory, threat detection and vulnerability management. Zone and conduit segmentation to ISA/IEC 62443.
Platforms I work with daily
Siemens
TIA Portal · Step7 · S7-400H · S7-1500 · S7-300 · S7-200 · LOGO! · WinCC · PCS7
Rockwell / Allen-Bradley
ControlLogix · CompactLogix · SLC500 · Studio 5000 · RSLogix · FactoryTalk View
GE / Emerson
PAC RX3i · Series 90-30 · Machine Edition · Proficy iFIX · Historian · Cimplicity
Schneider Electric
Momentum · TSX · Proworx NxT · Wonderware InTouch · System Platform
Otros / Others
Mitsubishi · Delta · Danfoss VLT · FC300 · Nozomi Guardian P550
Free engineering tools
Calculators I use on site and leave open for whoever needs them. No sign-up, no ads, and they work from a phone on the plant floor.
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Proficy · iFIX compatibility
Operating system, database and compatible versions across 48 Proficy products.
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iFIX alarm queue sizing
Size the SCU queues, avoid overflow and suppress communication alarms.
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iFIX PDB 15AL scaling
15AL scaling in the iFIX process database.
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Wonderware InTouch scaling
Raw 0-32767 ↔ engineering units, with the exact Tagname Dictionary fields.
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Siemens S7-1200/1500/300 scaling
Analog scaling in Step7 and TIA Portal.
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Proworx NxT 4-20 mA scaling
4-20 mA scaling in Proworx and NxT (Momentum, TSX).
Why work with me?
- I speak both the language of machines and the language of networks: the same engineer configures the fieldbus and reviews the switch traffic.
- I build systems that are resilient as well as efficient — redundancy, diagnostics and recovery designed in from the start.
- I care about clean code and clear documentation, so that in five years another technician can maintain it without calling me.
Certifications & training
- Certified Profibus DP/PA Engineer — Profibus International (2019)
- OT Cybersecurity — Nozomi Networks (2024)
- Wonderware System Platform 2014 R2 — Schneider Electric (2018)
- SIMATIC PCS7 DCS — Ideas Automation (2016)
- Advanced iFIX — Buenos Aires, Argentina (2014)
- Registered with the Bolivian Society of Engineers (S.I.B.)
Got a line to migrate or a network to secure?
I work on site in Bolivia and remotely for clients in the United States and Chile. Tell me which platform you run and I'll come back with a concrete plan.