Can I commission only the control system if I already have the mechanics?

Yes — that is exactly this project. The customer owned the mechanical assembly, and Poyutech delivered the PLC program, HMI screens, and the electrical cabinet design and build. We also take on full turnkey projects starting from mechanical design.

Can I commission only the HMI screens?

Yes. Screen planning, implementation, PLC tag mapping, and communication setup can be scoped separately. We also handle HMI replacement and screen redesign on existing machines, using either Weintek EasyBuilder Pro or our own Android applications on panel PCs.

Which PLCs and servo drives does Poyutech work with?

Mainly LS Electric XGB and XGI series, with both dedicated positioning modules such as the XBF-PD02A and built-in positioning. On the servo side we have worked with LS Mecapion, Mitsubishi, and Chinese pulse-type drives such as the KS100.

Do you build the electrical cabinet in house?

Yes. We draw the component layout 1:1, then machine the mounting plate, cut the door, and wire it ourselves. Engraving the customer's logo into the door is part of the work.

Where is Poyutech located?

Poyutech is in the Gyeyang Knowledge Industry Center, Incheon, South Korea. We travel throughout the Seoul metropolitan area and take projects elsewhere in the country. We are registered on Korea's public procurement channels (Nara Jangteo and S2B), so schools and public institutions can purchase directly.

Building the Control System for a Twin-Spindle Drilling Machine — PLC, HMI and Cabinet

Q: What do you need in order to quote?

No specification document is required. Describe the motion you want and we will break it into quotable pieces. Email 3d4utech@naver.com or call +82-70-7510-4839.

In one line

The customer owned the mechanical side. Poyutech designed and built the entire control system — PLC program, six HMI screens, and the electrical cabinet.

Machine overview

What the machine does

A purpose-built machine that drills from both sides at once into bushings and tube stock.

The operator loads a part, the clamp closes, the part is centred, both drill heads advance together, break through, and retract. Loading and unloading is the operator’s entire job.

The two sides have to face each other exactly. If the holes do not line up, the part is scrap. That is where the difficulty lives.

Drill heads and clamp station

Control architecture

Item	Configuration
PLC	LS Electric XGB series
Positioning	XBF-PD02A special module
HMI	Weintek 10” touch panel (EasyBuilder Pro)
Servos	4 axes — feed left/right, spindle left/right
Command	Pulse (PLS/DIR) position and speed control on every axis
Supply	Single-phase 230 V AC

We standardised every axis on pulse control instead of mixing in communication-based speed commands. When axes use different schemes, narrowing down a fault takes longer. One scheme means fewer places to look.

Six HMI screens

Operator-facing and supervisor-facing screens were separated.

Screen	Contents
Run	Current process step, cycle count, TACT
Recipes	20 model presets, stored and recalled
Manual	Per-axis inching, spindle jog, clamp open/close
Monitor	I/O contact states, servo commanded vs actual position
Alarms	Occurrence and recovery history
Production	Daily and cumulative counts, good/scrap, drill tool-life counter

Operator panel and HMI run screen

The recipes and the tool counter are what earn their keep. Typing parameters by hand on every changeover produces mistakes; selecting a model number does not. The same goes for drill life — replacing a tool on a number rather than on feel makes sudden breakage rare.

The cabinet started as a drawing

The component layout was drawn 1:1, then the mounting plate was machined, the door cut, and the wiring done in house. The customer’s logo was engraved into the door.

A proper layout drawing means nothing surprises you on site. Duct clearances, DIN rail pitch, drive ventilation gaps, and whether the profile fixing holes collide with components — all settled on the drawing first.

Faults that actually cost us time, and how we fixed them

Written symptom-first so anyone who arrived here from a search can jump to their case.

XBF-PD02A: servo turns one direction only

Symptom — Forward runs normally; reverse does nothing. Wiring and drive parameters all check out.

Cause — The positioning module’s pulse output mode was set to CW/CCW. In that mode, reverse pulses go out on the second output, which the drive treats as its direction line. A drive expecting pulse-and-direction therefore receives no pulses at all in reverse.

Fix — In XG5000, change the module’s basic parameter for pulse output mode to PLS/DIR. Both directions work immediately. No change to drive electronic gearing or wiring is needed.

XBF-PD02A: error 492 right after installation

Symptom — Error 492 on both X and Y axes as soon as the module is fitted.

Cause — A hardware upper-limit error. The limit sensors are not wired yet, and the parameters default to normally-closed contacts, so the module reads a permanent limit condition.

Fix — Either set “use upper/lower limit” to 0 in the basic parameters, or teach the input logic to normally-open (bit 0) with APM_SIP, save with APM_WRT, and reset with APM_RST.

LS XGB: Ethernet connection refused

Symptom — IP, subnet and gateway are all correct, yet neither XG5000 nor the HMI can reach the PLC.

Cause — The FEnet security setting “enable host table” — an IP allowlist — was active. Every unregistered IP is blocked.

Fix — Disable that option and the connection succeeds immediately. Check the dedicated-connection count while you are there.

Weintek HMI: buttons do not write to the PLC

Symptom — The button presses on screen, but the PLC value never changes. Communication is otherwise fine.

Cause — The device type in EasyBuilder was set to MW_Bit, a bit inside a word. That addresses a completely different location than %MX.

Fix — The LS XEC FEnet driver has a separate MX type. The PLC’s %MX64 is MX type 64. Switching the device type to MX resolves it. Word displays can stay on the MW type.

START button does not launch auto mode

Symptom — Pressing START does nothing. The ladder looks correct.

Cause — The STOP bit was stuck at 1, clearing the auto-mode latch on every scan.

Fix — Set the HMI button attribute to Momentary. Configured as Toggle or Set, it stays on permanently after one press.

Spindle drill head

About Poyutech

Poyutech is a smart manufacturing company based in the Gyeyang Knowledge Industry Center, Incheon, South Korea. We handle mechanical design, control design, HMI development, and control cabinet fabrication under one roof.

9 registered patents
Registered on Korea’s public procurement channels (Nara Jangteo, S2B) — schools and public institutions can purchase directly
Own products: laser marking systems (Poyumark), browser-based CAM software (PoyuCAM), 3D printing services (3D4U)
In-house CNC machining, 3D printing, and laser processing

We are a three-person company, which means the principal engineer designs the machine and answers the phone. There is no sales layer in between.

What you can hand us

Take the whole machine, or only the part you are stuck on.

Scope	Contents
Turnkey	Mechanical design, fabrication, and controls
Control system	Where the mechanics exist and PLC, HMI and cabinet are needed
HMI only	Screen planning, implementation, tag mapping, communication setup
Cabinet only	Layout design, panel machining, wiring, logo engraving
Retrofit	Controller replacement or added functionality on existing machines

No specification document is required. Describe the motion you want and we will break it into quotable pieces.

Contact

Email — 3d4utech@naver.com
Phone — +82-70-7510-4839
Address — Gyeyang Knowledge Industry Center #313, Incheon, South Korea