A Case Study
Specification of I/O
Administration
Plant Configuration
Node Configuration
PLC program
Plant Graphics
In this chapter we will give you an idea of how a ProviewR system is created. The process to
control is very simple in this case study - an intersection with four traffic lights - but it
will give you an idea of the steps you have to go through when creating a ProviewR system.
The traffic lights should be able to operate in two different modes:
- Normal: The traffic lights run normal cycle of red, yellow and green.
- Flash: The traffic lights are flashing yellow.
Fig Traffic lights in an Intersection
The operating mode of the traffic lights is decided by an operator via an operator station, or
by a maintenance technician who influences a switch. The maintenance technician can change
mode only if the operator has switched the traffic lights to service mode.
Figure 'Traffic Lights, Control Panels' shows the different switches and indicators needed by
the operator and maintenance technician respectively to be able to monitor and control the
system. These could be realized with plant graphics on the operator station or with hardware.
Fig Traffic Lights, Control Panels