LineSight vs Siemens Opcenter APS: Scheduling the Line or Planning the Cut?

What Opcenter APS does well

Preactor has a long record. Siemens bought the UK company in June 2013, when Preactor was reported to have more than 4,500 installations in 75 countries, and the product now sits in the Opcenter portfolio. Few schedulers have that many plants behind them.

The product ladder is generous. Preactor Express is free to use. The Advanced Scheduling editions run from Standard through Professional to Ultimate, and Ultimate includes a developer license for changing the data schema and writing custom scheduling rules. Advanced Planning covers the longer horizon. Siemens says the system can be customized "without disturbing core Preactor code", which matters to anyone who has lived through a heavily modified ERP.

Functionally it does what a planner wants from a scheduler: multi-constraint order scheduling, BOM-level planning, material allocation rules, interactive graphs for moving the master schedule, and side-by-side scenarios. It can run on its own or sit alongside ERP, MES, data collection and OEE systems. Siemens' published case studies include metal fabrication and forming plants such as Metal Design in Slovenia and ETEM Gestamp.

Where it stops short for a coil processor

We found no mention of cutting patterns, trim loss, coils, slitting or nesting on the Preactor product page, and the metals case studies we found are fabrication and forming rather than coil processing. The material allocation it describes ties available material to orders in a schedule. It does not describe choosing which width combination to run across a coil.

That leaves a gap for a service center. Someone still has to decide that orders A, C and F come off coil 4471 at 12.25, 9.5 and 5.31 inches before there is a job to schedule. With a scheduler alone, that someone is the planner and a spreadsheet.

How LineSight works differently

LineSight pulls open orders and inventory from the ERP in real time, then searches the order-to-coil combinations a person has no time to check, looking for setups where widths nest together with the least trim. It respects the rules of the floor: grades, gauges, slit widths, PIW, ID/OD, edge conditioning, knife setups, multi-pass, coil weights, min and max mults, skidding and must-ship orders.

It builds slitting and cut-to-length plans, and a person approves each one before anything goes to the ERP or the floor. Work orders, PDF plans and the ERP update go out from there. When a planner overrides a pattern, later plans respect it.

What LineSight does not claim is plant-wide finite-capacity scheduling. Its plans account for lead times and line speeds, but it does not offer the multi-resource Gantt view and dispatch rules that Opcenter is built around.

Three situations on the same floor

Three lines, two shifts and a packaging bottleneck

You know what you are cutting. The problem is that the slitter, the CTL line and the packaging station keep starving and blocking each other. This is a scheduling problem, and Opcenter is designed for it.

Twelve orders, nine coils, one slitter

The question is which coils to open and how to arrange the widths so the drop is small and the due dates hold. This is a cutting problem with millions of candidate answers. Our piece on the 65-year-old math problem explains why a planner can check only a handful of them. LineSight is designed for it.

Finding out whether you need a scheduler at all

Preactor Express costs nothing to try. LineSight's first three months run on your live orders at no charge. Both let you test against your own data before you commit.

Pricing

One point of scrap at a 50,000 ton operation buying at $1,000 a ton is $500,000 a year. Try your own figures in the scrap calculator.

Can you use both?

Often, yes. A larger processor with several lines and downstream operations could use LineSight to decide what gets cut from which coil, then schedule the resulting work orders in Opcenter alongside everything else. Neither vendor publishes a connector between the two, so the handoff would run through the ERP or an integration built for the purpose. Decide early which system owns the slitter's sequence so the two do not argue.

The bottom line

Opcenter APS is a mature, widely used scheduler with a free way in, and it is the stronger choice when the work is known and time is the constraint. LineSight is the stronger choice when the metal is the constraint: which coil, which pattern, how much trim. Elite Steel cut its scrap rate 2.9 points and added about $850K in annualized revenue on LineSight. For the wider field of coil planning tools, see the buyer's guide.