Structure And Task Of The Example - Siemens SIMATIC S7-1500R/H Getting Started
Redundant system
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Also See for SIMATIC S7-1500R/H:
- Manual (46 pages) ,
- Equipment manual (44 pages) ,
- System manual (523 pages)
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Introduction to the example
1.2 Structure and task of the example
1.2
Structure and task of the example
Automation task light and fan control in a tunnel
The continuing increase in traffic volumes coupled with growing safety requirements demand
state-of-the-art tunnel systems. At the same time, equipment requirements for these
constructions are rising, especially when it comes to maximum safety and availability.
The example below comprises three subtasks:
● Control of the safety ventilation as a function of the air pollution level in the tunnel
● Control of the traffic lights and the barriers as a function of the air pollution level in the
tunnel
● Control of the lighting in the tunnel as a function of the illuminance of the outdoor light
Figure 1-1
Example Light and fan control tunnel
Control of the safety ventilation as a function of the air pollution level in the tunnel
Fans are used in the tunnel to extract harmful exhaust gases and supply fresh air.
Uninterrupted operation of the ventilation system is required to keep the concentration of
pollutants below a set level. Constant availability must be ensured for the event that
individual automation components fail, for example because of a fire in the tunnel. The S7-
1500H redundant system with two redundant H-CPUs is used to ensure fan availability.
Three fans ventilate the tunnel.
Control of the traffic lights and the barriers as a function of the air pollution level in the tunnel
The tunnel entries are controlled via two traffic lights. The traffic light control also requires
higher availability for safety reasons.
If the pollutant concentration exceeds a maximum limit for more than 2 minutes in a tunnel
section, then the tunnel is blocked.
Control of the lighting in the tunnel as a function of the illuminance of the outdoor light
The abrupt transition between light and dark at the entry to the tunnel is compensated for by
tunnel lighting in the various tunnel sections. Two light sensors measure the light intensity
outside the tunnel. The light intensity of the entry lights in the tunnel is controlled accordingly.
The interior lights in the tunnel are controlled by the prevailing daytime / nighttime.
6
S7-1500R/H redundant system
Getting Started, 10/2018, A5E44910930-AA
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