How can be build railroad control panel on STN
Vladimír Soukup
18.3.2005

Introduction

This panel was build as part of control panel for Zababov/FREMO station Lipa and for testing panel firmware itself. Design of panel has relation to prototype CSD relays panel from 60'-90's by AZD company. Construction and firmware can be used also for other railrods panels and ages.

STN firmware support not only basic function like lightening, flashing, recognition of lenght key press, double click, shift, multi state switches and etc. but mainly function of show and control objects of real railroad which behaviour depends by prototype funkcionality.

Assignment of collors to keys and indicators of Signal Tower I of sst. Lipa. Size of panel is 250x500mm, pdf

Mechanical construction

Obr. 2 - Cut by shorter side of panel with layers by color.
Lipa_St1_ram.pdf

Text - yellow layer
It is made from film with text and holes for keys and lights. The film laid on surface and can be substitute depends on side, language, functions and etc.

Lipa_St1_Cira_folie_490x240_Potisk_Sever.eps - Czech text for control of station from the north.
Lipa_St1_Cira_folie_490x240_Potisk_Jih.eps - Czech text for control of station from the south.
Lipa_St1_Cira_folie_490x240_rezani.dxf - holes drawing for cutting plotter

Railroad - red layer
It is made from self-adhesive transparent foil (70-90% transparency). On the foil is printed railroad layout and other symbols which are not depend on side and language. Surface is covered by lamination. Foil is glued to outside panel before mechanic montage of keys and indicators.

Lipa_St1_Transparetni_samolepici_folie_500x250_Sedy_potisk.eps - railroad layout of sst. Lípa st. I
Lipa_St1_Transparetni_samolepici_folie_500x250_rezani.dxf - holes drawing for cutting plotter

Outside panel - blue layer
It is made from 2mm aluminium plate. Holes for indicators, keys, slides and spacers M3 are made by milling cutter. Alluminium can be substitute by 1mm steel or 3mm PVC.

Lipa_St1_Hlinik_500x250x2_freza.dxf - milling cutter drawing

Inside panel - white layer
It is made from 3mm PVC plate and its hold LED's for slides. Spacers have lenght 10 or 8 mm.

Lipa_St1_Plast_480x230x3_freza.dxf - milling cutter drawing

Electronic - green layer
In this case PCB STN-A in Tower variant. Blue and white layers have to have holes for spacers 20mm which are used for mechanic montage of PCB. Inside panel can be mount also other PCB's by example PC interface.

Zip with drawings

Mechanical building

The outside panel with mounted spacers from outside.

The outside panel from inside. From outside has been glued railroad layer. You can see foil on slides.

The same situation from outside.

Keys and indicators has been mounted to the outside panel.

The inside panel from the top. You can see "big" holes for keys and indicators of outside panel. Thay are big enough for substitution of any part.

The inside panel from the top with indicators for slides.

The outside panel and the inside panel bolted together.

Cut of panel at the end of mechanic montage.

Electric construction

It is done by matrix of keys and LEDs. One STN-A, Tower can control up to 64 keys and up to 128 LED's. For bigger panels you can add next.

Matrix of keys. Address of key is done by sum of row and column address.
By example panel of St1 of sst Lipa use 32 keys.

Matrix of LEDs. Address of LED is done by sum of row and column address.
By example panel of St1 of sst Lipa use 111 LEDs.

Remeber that LED is not symetric device. You can see mechanic drawing in compare with LED symbol.

STN-E with the same indications which was used in key and LED matrix above.

Electric building

Detail of real key matrix (blue) and LED matrix (brown).
Column and rows inside the matrix was resolved by combination with white.

You can see whole arrangement with STN-E. Wires are glued by fuse glue.

The same situation with STN-A, Tower.

Inside the panel is placed also STN-A in variant RS232-RS485 as STN bus master nad PC interface.

The panel from inside in a wood box.

The panel from outside in wood box. On the picture is not text film on surface.