Hire a freelance automation integrator

Individual machines usually arrive working. A line does not. Each unit comes with its own controller, its own HMI, its own idea of what “ready” means and its own fault handling, and somebody has to decide how they hand product to each other, what stops what, how a jam on the labeller affects the filler two stations upstream, and which single screen an operator looks at. That is line integration: the handshakes, the shared state, the alarms, the mode logic, and the hundreds of small agreements between vendors who have never spoken to each other.

A large share of this work is not new lines but retrofits and migrations. A retrofit keeps the mechanics and replaces the control system: obsolete PLCs whose spares are gone, drives nobody can source, an HMI running on an operating system that has not had a patch in a decade. A migration moves a working program to a current platform — SLC or PLC-5 to ControlLogix, S7-300 to S7-1500 — which is never a straight conversion, because the conversion tools produce code that runs but that nobody wants to own. Both start with reverse-engineering: reading a program with no comments, written by someone who left, to work out what the machine actually requires before anything is allowed to change.

And both are done under a constraint that has nothing to do with engineering: the plant has to keep producing. Work happens during a shutdown window measured in days or hours, often at night, with a tested rollback plan, and with the knowledge that overrunning the window costs more than the whole project. An integrator who asks about the shutdown window and the rollback plan in the first conversation has done this before.

The acceptance sequence is what the engagement is actually judged on. A factory acceptance test, or FAT, runs the system at the builder’s or integrator’s premises against a written test specification, with the client present, before anything ships — ideally with simulated I/O so fault paths can be exercised rather than hoped for. A site acceptance test, or SAT, repeats it on real equipment after installation, which is the first time real sensors, real material and real timing get a say. Commissioning is the stretch in between and after: point-to-point checks, loop testing, dry cycles, product trials, tuning, and then handover with documentation, backups and operator training. Insist that the test specification is written and agreed before the work starts; a FAT without one is a demonstration, not a test.

One thing to be clear about, because the word “integrator” normally means a company. A system integration firm takes contractual responsibility for a working line, carries insurance, holds the safety sign-off and sends a crew. A freelance engineer hired through Ingenium is one engineer on a project you are still managing — frequently the right one, and frequently the most experienced person in the room, but the project management, the safety assessment and the responsibility for the finished line stay with you unless you have agreed otherwise in writing. Ingenium holds the contract and the money. It does not take on the engineering.