Six Drawers, One Discipline

Computer Integrated Systems Design Services

Long Creation Machines Overseas Co., Limited drafts, integrates and commissions control systems for production floors and commercial spaces across Kowloon: machine interlocks, sensor networks, HMI panels and data logging backends designed on paper first and proven on site.

The six services on this page are the six drawers of our working cabinet. They can be engaged one at a time or as a complete system, but each one leaves a drawing behind, and each drawing feeds the next. A factory floor that buys only the schematic still receives a document worth keeping, because the schematic is the place where every later decision is anchored. A floor that takes all six receives a system that has been thought through from the first line to the last as-built stamp.

We work from a studio in Rm 1406A 14/F THE BELGIAN BANK BLDG, 721-725 NATHAN RD, Mong Kok, Hong Kong, and we travel across Kowloon to site. The address below the brand matters because our method depends on the floor and the drawing being close enough to argue with one another. When a sensor turns out to be mounted where a technician cannot reach it, we want to redraw the sheet the same week, not the same year.

Flat A-1

Control System Schematics

A control system schematic is the master sheet of a project. It records where power enters, how it is distributed, which controller governs each zone, how many inputs and outputs are reserved, what signal type each field device uses, and which terminal number a technician will find when they open the panel door. Long Creation Machines Overseas Co., Limited treats this sheet as a contract with the future: a repair technician who reads it five years from now must be able to trace a fault without calling us.

We begin by walking the floor and listing every actuator, sensor and safety device, then group them into functional zones. From that list we draw the architecture, assign controller and I/O capacity with a healthy reserve, and mark the separation between safety circuits and ordinary control circuits. Dimension lines in rule blue carry the notes that explain clearances and groupings; a single trace teal path highlights the most important signal of the design so any reader can follow it end to end.

The deliverable is a numbered set of sheets, each with a title block naming the project, the revision and the studio. Revisions are never erased. A new decision becomes a new revision triangle, and the old sheet stays in the flat file so the history of the system survives every change. That habit protects the client when a machine is rebuilt and protects us when a question arises years later.

Flat A-2

PLC and HMI Integration

Once the schematic exists, logic and screen are written as a pair. A programmable logic controller decides, and a human machine interface explains. If the two are written by different houses with different assumptions, the operator ends up pressing buttons that do not match the words on the screen, and a routine fault becomes a mystery. Long Creation Machines Overseas Co., Limited avoids that split by mapping every tag in the program to a faceplate on the interface and every alarm condition to a plain message line.

We build the controller program in structured routines that follow the zones of the schematic, so the code and the drawing use the same names and the same order. Mode selection, start permissives, sequence steps and fault handling each get their own routine and their own screen section. The interface is designed for a gloved hand and a bright factory light: large targets, high contrast, and no decoration that could be mistaken for a status indicator.

Before anything reaches the floor, we test the pair on a bench with a simulator, driving inputs and watching outputs and screens respond together. This bench pass catches the naming mistakes and the missing states that would otherwise be discovered at the worst hour of a commissioning night. Only when the bench cycle runs cleanly does the program travel to site in the engineer bag.

Flat A-3

Sensor Network Design

A machine can only control what its sensors can feel. Sensor network design is the discipline of choosing the right device for each physical fact and routing the resulting signals as a coherent network. We select proximity, photoelectric, pressure, flow, temperature, level and encoder devices according to range, response time, environment and the tolerance the process actually needs, and we document the mounting rules that keep a photocell from being blinded by a shiny surface or a probe from sitting in a dead pocket of air.

The network side matters as much as the sensor side. Digital and analog signals behave differently over distance, and a cable that runs beside a motor drive can carry noise that turns a clean reading into a flickering number. We plan cable routes, shielding and grounding, and we decide which signals deserve a dedicated pair and which can share a bus. Every device is given an address, a tag and a location note that matches the schematic sheet.

The result is a floor that can describe itself: how full the hopper is, how fast the conveyor moves, how warm the room has become, how many units have passed. Long Creation Machines Overseas Co., Limited designs the network so those facts are reliable enough to be trusted by both the controller and the person reading the screen.

Flat A-4

Machine Interlock Engineering

An interlock is a promise that a machine will not do something dangerous or destructive. Machine interlock engineering designs the conditions under which motion is forbidden: a guard door open, an e-stop pressed, a light curtain broken, a pressure low, a temperature high. Long Creation Machines Overseas Co., Limited draws these conditions as explicit logic, implements the safety-critical ones in hard wiring or certified devices, and mirrors the ordinary ones in the controller so the operator receives a clear explanation rather than a dead machine.

The engineering question is always the same: what must be true before this actuator may move, and what must be false before it may not. We answer it device by device, then draw the interlock chain as a ladder of conditions with each contact numbered and each relay or safety module named. Start permissives, run permissives and stop categories are separated so that a maintenance override can never quietly disable a guard.

Interlocks are also drawn where two machines share a space. If a transfer car cannot enter while a press is closing, that agreement belongs on a sheet, not in the memory of the person who wired it. By writing the agreement down, we give the next technician a fighting chance and give the site a system that behaves the same way every shift.

Flat A-5

Data Logging Backends

A control system produces facts all day: cycle counts, temperatures, pressures, reject reasons, alarm events, run hours. Without a backend, those facts evaporate when the screen refreshes. Data logging backends give the factory a memory. Long Creation Machines Overseas Co., Limited designs the storage, the retention rules and the retrieval view as one system, so the numbers that reach a report are the same numbers the controller produced, with a timestamp that can be trusted.

We collect data from the controller, buffer it so a network interruption does not lose events, and write it into a structured store with clear naming. Retention rules decide how long raw readings are kept and when they are summarised; a report view turns the store into something a manager can read in a minute: output per shift, downtime by reason, temperature excursions, alarm frequency. The backend never invents data and never silently drops it; a gap in a record is itself recorded as a gap.

Where a client already runs spreadsheets and a shared drive, we meet them there rather than forcing a new platform. Where a client wants a small screen on the office wall, we can serve a simple dashboard. The point of a backend is not novelty; it is that the night shift and the morning manager are looking at the same truth.

Flat A-6

Commissioning and Site Support

Commissioning is where a drawing becomes a machine. The engineer who drew the sheet walks the floor, proves each loop in the order the schematic describes, tunes each setpoint against the real process and corrects whatever the site reveals. Long Creation Machines Overseas Co., Limited keeps the same engineer on the drawing and the floor because translation loses meaning, and a designer who has heard a valve chatter at two in the morning will draw a better note for the next project.

Our commissioning routine is orderly: verify power and grounding, check each field device point to point, download and test each control zone in isolation, then run the whole line through a full cycle under supervision. Safety functions are tested first and proven before production begins, and every test result is written onto the commissioning record. When a fault appears, we chase it to the terminal number that the schematic predicted, which is the quiet reward of drawing before wiring.

Support continues after handover, because a first cycle is not a finished line. Setpoints drift, materials change and operators discover the edge cases that no drawing anticipated. We keep the as-built revision current and stay reachable by email and phone at +85244170919, so the studio and the site remain in the same conversation.

How A Project Moves Through The Studio

The six services are not a menu so much as a route. Most projects travel the same path, and each station leaves a drawer richer than it found it.

Survey and brief. We walk the floor, list the equipment, and agree what the system must guarantee before anything is drawn.
Architecture. Control System Schematics set the zones, the I/O capacity and the safety separation on paper.
Feeling and forbidding. Sensor Network Design decides what the floor can feel; Machine Interlock Engineering decides what it must not do.
Logic and view. PLC and HMI Integration writes the program and the operator screens as one matched pair, tested on the bench.
Memory. Data Logging Backends give the system a durable record of everything it has done.
Proof. Commissioning and Site Support carries the drawing to the floor, proves every loop, and stamps the as-built revision.

Bring Us A Floor Worth Drawing

Send a note describing the line, the machine or the room. Long Creation Machines Overseas Co., Limited will propose the drawers your project needs and quote a schematic plan before any hardware is named.

Start a Schematic Plan