I ended up with a 40-yrs old PLC,with no support and no documentation. As requested in the project description, Mr. Stolz mentioned he had experience with that series of PLCs, so I contacted him. He was eager to understand clearly my requirements, helped me with a set of solutions that allowed me to solve my problem, and worked with flexibility with us in spite of living in the opposite side of the globe. I am so grateful for his support and professionalism. A real gem in freelancer.