Articles about how HMI manufacture,assemble and import the program

1. What? 95% of HMI users do NOT know?!
Although you have been working in this field for so many years, I bet there are still
something you don’t know. You don’t believe? So let’s have a look!
Is it difficult to operate a finished HMI according to the prompts on the screen? No, just
a piece of cake! But do you know how to import the program? How is the HMI assembled?
And how many procedures have it gone through before you can operate it?
I. Mainboard Processing
Our mainboard is produced by OEM, which mainly uses imported automatic silk
printing machine, high-speed, multi-function mounter and automatic plate machine, domestic
lead-free wave soldering machines and other equipments, etc.
The first phase of HMI production is mainly consisted of 6 parts, i.e. technics room, SMT
production line, plug-in unit production line, board repair production line, commissioning
room and maintenance room. All of above constitute a perfect and tight board production
system, that is the core of the manufacturing.

2. II. Parts Detection
The device is assembled from a pile of scattered parts, which will be detected
thoroughly before being assembled, especially the mainboard. The detecting instrument will
detect all of its performances, including communication, display, voltage, etc. Any abnormal
situation, such as communication error, blank screen, no light in the power indicator, etc, will
be detected immediately.
III. Paint the conformal coating
After passing the detection test, the mainboard will be paint the conformal coating on

3. both sides and then baked in the raill furnace with 90℃ temperature for one to two minutes,
thus can protect it from moisture, dust and static electricity. The painted mainboard has
fluorescent powder, so the fluorescence can be seen in ultraviolet light, thus can detect
whether it’s painted or not.
IV. Device Assembly
HMI assembly parts include LCD, touch screen, mainboard and shell, the whole
assembly procedure processes in the professional HMI production line.
Among them, the FPC connecter is fixed with glue, thus prevent them from falling off

4. in vibration. Instead of the former acetate tape with corrosivity, the mainboard is now affixed
with a layer of yellow high temperature glue, which is more safe and practical, and can
effectively prevent FPC connecter from vapor and water-drop, just like an opening umbrella
on the mainboard.
Import LCD configuration file after the mainboard and parts being assembled, then
retest their performance to ensure normal display and operation

5. V.Normal Temperature Aging
Put the assembled devices on shelves in batch, then connect the test heads to power and
run quality testing for four to eight hours to exclude initial failure, rosin joint, black screen,
error in communication port, etc., thus ensure their stability and reliability.
VI.Man-machine Packing Line

6. Put the devices into packing line for time calibration and downloading the
factory project after the normal temperature aging, then detect their performance according
to different configuration files, finally put the built-in bar code, affix film on screen, clean
appearance, pack and put the panel into bags. The process of putting the built-in bar code is
extremely important, for it binds the machine and bar code together to form a data link, thus
the manufacturing, installation, storage and delivery information of each machine can be
detected according to its bar code.

7. VII. quality sampling inspection
Finally, the quality sampling group will select 20% packed HMIs randomly to detect
their performance and appearances. The qualified devices will be put into warehouse.
Every worker in the workshop wears a blue anti-static band. Why? It leads static
electricity into the ground through earth wire, which can prevent the chips and components
from the damage caused by the static electricity on human body, thus ensure the stability of
electronic devices. Thanks to the carefulness and professional spirit!
The PLC production line is similar to HMI production line. The laser engraving
machine is extremely important, which is used to engrave words and logo on PLC. It can
finish the engraving of a device in seconds by burning the plastic shell of PLC with high
temperature laser. It has high efficiency and low failure rate which is almost 0%.

8. The following picture shows the laser engraving machine and the whole device test of PLC.
Any WECON device, whether it’s HMI or PLC, must go through a series of strict
assembly and testing procedures before being delivered to clients.
The principle of constant improvement leads and encourages us to explore and create
more stringent production conditions. We strive to develop complete and perfect WECON
devices!