Capability
Obsolete DCS and PLC migrationwith the plant running.
Every plant reaches the point where the spares are gone, the engineering software no longer runs and the last person who understood the logic has retired. ATG migrates those systems — including the legacy base others will not touch — and, where the source has been lost, reverse-engineers it.
The old system leaves. Production does not.
What ATG delivers
Scope we takeunder our own contract.
- Migration study: as-found audit, I/O and logic recovery, risk assessment and cutover strategy.
- Logic conversion and HMI redevelopment with a documented functional equivalence check.
- Hot cutover planning — loop-by-loop or area-by-area — with rollback and bypass management on operating plant.
- Supervisory and HMI migration: legacy SCADA to WinCC, AVEVA, FactoryTalk or zenon without changing validated controller logic.
- Reverse engineering where source code, documentation or vendor support no longer exist.
- Decommissioning, appropriate disposal and updated as-built documentation.
Platforms and vendors supported
- Siemens Moore QUADLOG & APACS
- Honeywell TDC 3000
- Yokogawa CENTUM CS3000
- Rockwell PLC-5 & SLC 500
- Siemens S5
- Schneider Modicon Quantum
- GE Mark V
- Triconex Tricon
- Sensys Intellimax and other legacy SCADA
Standards applied
- IEC 61511 (MOC and validation for safety functions)
- ISA 101 / 18.2 (HMI and alarms)
- Client MOC procedures
Typical scope of work
From the first meetingto the handover dossier.
The old system leaves. Production does not.
- AuditAs-found survey, I/O recovery, logic and document recovery, obsolescence and risk register.
- ConvertLogic translation, HMI rebuild, network and cabinet design, simulation and FAT.
- Cut overStaged hot cutover with rollback, bypass management and witness points.
- ClosePerformance verification, decommissioning, disposal, as-builts and training.
Where we work
Al-Khobar to Yanbu,and on rotation worldwide.
Kingdom of Saudi Arabia
Own Saudi entity and employer file; established mobilisation to Al-Khobar, Dammam, Jubail, Yanbu, Jeddah, Rabigh, Riyadh. Works under the client or plant project insurance.
International
Engineering and commissioning teams under long- and short-form agreements — residential, rotational and offshore — supported from Al-Khobar and Lahore.
Related projects
Claim,then evidence.
Yanbu Phase III — emergency diesel generator, jetty and metering gateway re-engineering
Steel melt shop HMI replacement and WinCC V8.1 upgrade
WWTP Jeddah Industrial City 3 upgrade, approx. 300 I/O
Frequently asked
Questions buyers askbefore the shortlist.
Which obsolete platforms have you migrated?
Rockwell SLC 500 to Siemens S7-1500 on a polyester dryer at Lucky Core Industries with cutover on a running plant; Sensys Intellimax SCADA to a PC-based supervisory system at Japan Power; steel melt shop HMI to WinCC V8.1 at Arab Steel, Dammam; and Siemens S7-400H emergency generator control re-engineering at Yanbu Phase III.
What does hot cutover mean in practice?
The new system is installed and tested alongside the old one, then loops or areas are transferred in planned steps with the plant producing, each step with a rollback path and a bypass record.
Can you recover logic when the vendor software is gone?
Usually, yes. We reverse-engineer from controller memory, wiring and operating records into a documented functional specification, then rebuild and verify.
Distributed Control Systems
Yokogawa, Emerson, Honeywell, Siemens, ABB and Foxboro — design, configuration, FAT, commissioning and support.
Large process. Zero surprises.Read more →PLC, HMI & SCADA
Siemens, Rockwell, Schneider, ABB and Mitsubishi with WinCC, AVEVA, FactoryTalk and zenon — machine to plant.
Small plants deserve serious engineering.Read more →Commissioning & Start-Up
Loop testing, function testing, SAT, interface testing and start-up support — in the Kingdom and on rotation abroad.
The plant starts when the checklist says so.Read more →Start a conversation
Tell us whatyou need built.
Send the scope, the P&IDs or just the problem. A control-systems engineer — not a sales desk — replies from Al-Khobar, normally within one working day.
Al-Khobar head office
+966 59 350 1825 · +966 53 849 2308Proposals sales@atgpa.com
General inquiries@atgpa.com
Technical support techsupport@atgpa.com