Capture and measurement - Characteristics of the facility

English

The introduction of elements of capture and measurement, will try to be as least invasive as possible at all times to avoid interfering with the machine control programs (PLC's), and elements of capture themselves of the machine.

A priori, there are three possibilities to capture signals:

1) In some cases, the signals are captured from electrical frame, previously isolated through potential free relays.

2) Installation of new elements sensors to capture signals of interest: presence, axes position, level of voltage, current, etc.

3) In very specific cases (complexity, cost, ...) and always relying on the manufacturer's warranty on the machine, you will enter the control logic machine to capture and processing parameters.

If in doubt, always opt for independence electronics and software to obtain data that already exists on the machine.

Once captured, signals are transmitted to the control unit, which in most cases this is a PLC that specializes in communication tasks, as it should 'talk' simultaneously with different protocols: rs232, 422, 485 , modbus, tcp, devicenet, profibus, etc.

The control unit is responsible for providing all the data at the time of the process that is being asked. The link to the Produktika server (engine of the whole system) is done via Ethernet; depending on their environmental characteristics will be used UTP cable, fiber optics or wireless.

This server is a GNU / Linux system with two network segments: one for production or 'workshop' and the other for the administrative network. The physical characteristics of the machine (memory, processor, number of disks, etc.) depend on the volume of data required to manage and security requirements.

The Produktika server incorporates the following tasks:

– An communications engine responsible for interrogating each of the control units of the facility

– A database engine that stores data in each interrogation. Additionally, as database server, it will be responsible for servicing requests from customers who request them

– A TCP / UDP module, which will be linked to the web server system with the aim of providing information control units to remote clients in real time

– A web application with a navigation system that enables all perform the above tasks with efficiency and specificity. This application is the one that allows a customer through a web browser (Internet Explorer, Mozilla, etc.) access to the resources of the control system at any time, anywhere. Access is restricted due to unauthorized users. In addition, for security, operational parameters of the machine are not changed by remotely