A high capacity and configurable data acquisition and control system is installed along the tunnel, and is used both for taking and recording data from instruments and images during the tests, and for controlling the different ventilation systems. Its main characteristics are:


Distributed control system based in 13 Monitoring and Control Stations (EMCs) located at the lower emergency gallery, approximately each 40-50 m, plus two additional stations located at the main ventilation stations. All units are connected with the Central Control Station through a redundant fibre optic loop.

Structure monitoring and control system


Each EMC accepts inputs from external sensors, instruments and cameras in the following formats:

  • Analog inputs: 56 analog inputs (expandable if necessary), that can be configured to the following types and ranges:


    +/- 80 mV/10 MΩ, +/- 250 mV/10 MΩ, +/- 500 mV/10 MΩ, +/- 1 V/10 MΩ, +/- 2.5 V/100 kΩ, +/- 5 V/100 kΩ, 1 - 5 V/100 kΩ, +/- 10 V/100 kΩ


    +/- 10 mA/25 Ω, +/- 3,2 mA/25 Ω, +/- 20 mA/25 Ω, 0 - 20 mA/25 Ω, 4 - 20 mA/25 Ω


    150 Ω/10 MΩ, 300/10 MΩ, 600 Ω/10 MΩ


    K, E, N, J, K/10 MΩ


    Pt-100, Ni-100

  •  Digital inputs: 16 inputs (expandable if necessary) from external voltage-free contacts.

  • Data links: The EMC admit data input through serial links of the RS-422/485 type (4), either through Ethernet 10/100 BaseTX RJ-45 connections (4), under TCP/IP with MODBUS protocol.


Each EMC has the following outputs for controlling and regulating external equipment:


nº *

Ranges or types



0 - 10 V, +/-10 V, 1 - 5 V, 4 - 20 mA, +/- 20 mA, 0 - 20 mA



Relays (max. 500 mA at 24 VCC)

    (*) expandable if necessary

Data transmission

The EMCs are linked to the Central Station through a fibre optics trunk data communication system (100 Base FX) in a redundant close loop at 100 Mbps, using the MODBUS TCP/IP protocol.

Free optical fibre lines are available in the loop, for any additional equipment or application.

Central control station

Redundant system based on two independent computers connected through a local network, with a 10 KVA uninterrupted power supply. Data is displayed and recorded using a configurable SCADA software application (iFIX professional).

Example of SCADA monitoring and control screen

“San Pedro de Anes” Experimental Center 33189 Siero (Asturias) SPAIN
Phones: +34 985 74 16 45/+34 985 74 42 26
e-mail: info.tst@applus.com

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AS-246 road Km. 14,5 (Siero)

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