This week we finished the challenge of work stations. The last thing we did in this challenge was to connect the 4 workstations via PROFIBUS and do the PROFIBUS exercises also including an ETM200 model. After introducing the project on Monday and doing the exam yesterday addressed to the different communications in Step7 SIEMENS that we have explained, we have taken the place to start with the last challenge that has been introduced to us but that we have not yet had time to read it. The advantages and disadvantages of each communication method we have found are:
ADVANTAGES:
MPI (GD):
Everything is very neat.
You can send bits.
MPI (FUNCTIONS):
There are different function blocks (Get, Put, Send and Receive) so you can choose the one that best suits you.
PROFIBUS:
More control between communications because everything has to go through the master PLC.
DISADVANTAGES:
MPI (GD):
Maybe it takes you longer to load because you have to load it separately.
MPI (FUNCTIONS):
It's in different programming blocks so it can be messy.
It can not be sent bit by bit. Minimum you must send a byte.
PROFIBUS:
To load the PLC's you have to change the position of the cable so you lose time.
In technical English, during the last weeks we have done several exercises to practice our vocabulary. Today we have had to make a presentation to practice our speaking. I have decided to talk about the robotics, Gaizka about the cars of the future and Lander of the Internet.GAIZKA
THIS WEEK WE ALSO START WITH THE NEXT CHALLENGE. CHALLENGE 2
LANDER
This week we reconfigured the project with the Profibus protocol and we presented it. We also made a study about comunications, protocols, SAI's,... more or less all we can say about communications. As soos as we finished with the reconfiguration we improved our program for the final presentation and we finished few exercises with the ET 200M, a remoted control system.The final presentation and the exam is the week after so we've been preparing and studying for it.
