Lift applications

Switchboard development and production and complete electrical equipment for controlling programmable lifts in simple and collection modes (1st–4th generation).

vyt1.jpg, 75kB
↑ Up


  1. Initiation and development of the 1st generation

    In 1994, Amsoft was first addressed by Výtahy Ostrava. Negotiations were commenced regarding the possible development of a lift system “made-to-measure” according to specific requirements and needs of lift applications resulting from years of experience of lift specialists.

    In collaboration with technicians from Výtahy Ostrava, a 1st generation lift multiprocessor system was finally developed by Amsoft with a Mitsubishi main controlling PLC system. Serial production was commenced following successful working tests.

    vyt2.jpg, 33kB
  2. 2nd generation

    In 1996, production of the 1st generation was terminated and replaced by a 2nd generation system which used an improved multiplex data transfer system between the main controlling system in the switchboard and the lift equipment, i.e. the call button, display and other devices.

  3. 3rd generation

    During the year 1999, a 3rd generation of lift systems was being developed, fundamentally different from the previous generations in terms of the communication method of the main switchboard with the equipment, namely using a two-wire communication bus realized on the supply cable. At the beginning of the year 2000, first applications were put into test operation. After the first successful test operation, the production of the 2nd generation was terminated and the transition to the 3rd generation was completed.

    Up to the present day, over 2000 lift systems of all generations have been produced and mounted.

  4. At present, a 4th generation is being developed, oriented mainly on converter propulsion (synchronous and asynchronous) and communication connection using a CAN bus. Stress is laid on a wide range of equipment and comfortable controlling and signal accessories including graphic colour displays and voice output. Furthermore, it is remote access, remote online connection with dispatching, monitoring of working and failure states, eventually the possibility to perform remote changes to configuration, selected modes and properties using GSM or internet.

↑ Up

Brief description of the solution — 3rd generation system

vyt3.jpg, 21kB

Main technical equipment:

  • PLC main controlling systems — Mitsubishi Melsec FX1N,
  • microprocessor equipment — Motorola, Atmel,
  • communication connection — two-wire communication bus on the supply cables — developed by Amsoft,
  • Altivar 71 Schneider Electric, Control Techniques frequency converter
  • GSM LiftWatch

The main switchboard unit is composed of a freely programmable PLC system, type MITSUBISHI FX1N. This system performs continuous evaluation of input signals based on the embedded program and then controls its output circuits according to the states of these signals. Input signals comprise of binary input of the system and a communication line with an S-03 processor panel which provides two-wire communication with the shaft call buttons, cabin selection with displays and eventually other lift elements. Output signals of the system directly switch the contactors and relay of the control and power circuits, electrical magnet and valve coils and other circuits.

Brief description of the two-wire communication bus

The Mitsubishi FX1N central PLC controlling system uses a communication system for the collection of signals and signalling of data and lift states, which is composed of a main S-03 board in the switchboard, KV03-x cabin selections in MX3, SP03-1 shaft call buttons and D03 displays. The separate elements communicate with each other via a two-wire communication bus. The basic part of the two-wire communication bus is the S-03 main board which communicates with the peripherals, i.e. the cabin selection and separate call buttons and also provides communication with the Mitsubishi FX1N PLC system using a RS 485 serial cable connected to a programming port of the mentioned FX1N system.

The two-wire communication bus provides multiprocessor communication using two wires, which also serves as power supply for the connected devices. The separate devices communicate with each other using the microprocessor serial cable which uses a two-wire bus for data transfer. The principle of information transfer using the two-wire bus lies in the modulation of alternative current with small amplitude to 24V direct carrier voltage. Supply voltage for the separate circuits is generated by the filtration of the alternative component of the input signal and subsequent stabilization. The transferred data is separated from the input voltage using filtration circuits. Each connected system contains a microprocessor, modulator, demodulator, power and supply circuits.

Switchboard range:

  • VR3 — traction lifts
  • VRH3 — hydraulic lifts
  • VRM3 — converter lifts — asynchronous drive and synchronous gearless drive
  • VRMB3 — converter lifts without feedback
  • VRMD,T — duplex and triplex systems
  • Narrow switchboards for installation in corridors next to the cage


  • MX3 — concentrating and control box for the cage
  • SP03-1WD — shaft decoder
  • KV03 — cabin decoder
  • D01,02,03,04,05 — displays
  • HM03 — voice module
  • Gong
  • Intercom
  • Diagnostic device, service terminal
  • Emergency landing run
  • Accessories for lifts for disabled people


Hospital, evacuation, fire, loading with operator, without personal transport, with a key for priority selection from the cabin, autolifts and others according to the specific requests of the lift operator.

↑ Up