PJC Systens were approached when the customer was looking to build a mixing house, on site, rather than transporting material from their sister company many miles away. The plan was to move three mixing plants to the site and to integrate them into a total mixing solution for the business.

One of the mixers was being moved complete with it's control system controlling the feed to, and discharge from it. It soon became apparent, however, that this would not suit the proposed configuration.

PJC Systems secured the contract to control everything from:

• delivery of raw materials to the bank of silos

• transfer of materials from the silos to all three mixing plants

• control of mixer HSB7

• transfer of blended material from all three mixers to internal day bins

• transfer from day bins to compounders, and back to compounded day bins

• transfer from day bins to silos

When the second mixer was moved to the site, there were a number of modifications necessary which PJC Systems carried out. The third mixer has not yet been moved.

The central part of the system is a number of Mitsubishi Q series plcs, communicating with each other over MelsecNet H. Each mixer's PLC then communicates via ethernet with it's own Beijers E1151 Operator Interface.

Some of the control panels existed before PJC Systems' involvement but the manufacture of the other panels was by a local panel manufacturer with whom we work very closely.