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PLC, HMI, SCADA & MES — Code that controls industry.

Structured, maintainable code — written, simulated, and tested before it ever sees a panel. PLC, HMI and SCADA development with full MES & SQL integration for traceable production.

01 / overview

What we mean by programming.

Pac Technologies' programming practice covers everything that runs on the plant floor and one layer above it. PLC code that drives motors, valves, and instruments. HMI screens operators actually want to use. SCADA that gives plant managers the visibility they need without wading through alarms. MES and SQL integration that turns it all into batch records, OEE, and traceability.

We write code to be read — by the next engineer, by an auditor, by us in five years. Structured text where it belongs, ladder where it makes the line easier to maintain, and tag names that match the P&ID.

02 / capabilities

Capabilities & platforms.

PLC

Structured, maintainable control code

Rockwell ControlLogix, CompactLogix, Micro800
Siemens S7-1200/1500, TIA Portal
Schneider M340, M580, Modicon
Mitsubishi Q, iQ-R, GX Works

HMI & SCADA

Operator-first screen design

Rockwell FactoryTalk View SE/ME
Inductive Automation Ignition
Schneider Citect, Wonderware/AVEVA
Siemens WinCC Unified, WinCC Pro

MES & SQL

Batch, traceability, OEE

Custom MES on Ignition or Wonderware
SQL Server, PostgreSQL, Historian
OPC-UA, MQTT, Sparkplug B
ERP integration (SAP, Pronto, MYOB Advanced)

Standards

What we align to by default

ISA-88 batch / ISA-95 enterprise
GAMP 5 for regulated industries
OMAC PackML for packaging lines
Customer's own standards on request

03 / process

How a programming engagement runs.

Functional design

FDS written with you, signed off before a line of code. Tag list, sequences, alarms, modes — locked early.

Build & simulate

Code written and tested in emulation. Sequences run end-to-end before we ship a single binary.

FAT

Customer-witnessed FAT against the FDS. Defects logged, fixed, retested. You sign before we travel.

Site & SAT

Loop checks, point-to-point, then SAT. Operator training and runbook handed over with the keys.

04 / results

What changes for the customer.

Plants run with less unplanned downtime, more visibility into what's actually happening on the line, and code the next engineer can pick up and extend without a rewrite. The longest-running systems we've built are still in active production years later — not because we maintained them, but because we wrote them to be read.

05 / faq

Common questions.

Will you work on someone else's code?

Yes — most of our work is brownfield. We document what's there before changing anything, and we leave the structure cleaner than we found it.

Can you work to our internal coding standard?

Default. We write to your standard if you have one and to ours if you don't. Either way, the standard goes in the project pack.

What about long-term support after handover?

We offer rolling support agreements with named engineers and SLA-backed remote response. Nothing is locked behind us; everything you need to run it yourself goes with the handover pack.

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