All DCS equipment will be interfaced to the ECS. The generic architecture is the following:

High & Low Voltages, Temperatures, etc.

On an aim for standardisation the following guidelines have been adopted:

• Commercial equipment should be used as much as possible.

• The equipment should be accessible via a PCI card on a PC, not via VME.

• The HW interface to the equipment should be one of the CERN recommended fieldbuses:

  • Profibus, CAN, WorldFip or Ethernet.

• The SW interface to the equipment should be an OPC (OLE for Process Control) server, preferably delivered by the HW manufacturer. PVSS provides an OPC Client

• If the equipment manufacturer does not provide an OPC Server, the equipment can still be interfaced to PVSS by writing a DIM server. A PVSS DIM client is also available. 

• PLCs can be used whenever fast control loops are needed or whenever the safety of the system requires it. The CERN recommended manufacturers are:

  • Schneider and Siemens.

JCOP has performed some tests using commercial equipment, here are their recomendations.

Special equipment will be studied on a case-by-case basis. Please contact us!

In anticipation of the choice of the sub-detectors some equipment is already being integrated in the framework as ready-to-use components:

• CAEN high voltage power supplies

• ISEG power supplies

• WIENER low voltage supplies

• ELMB for analogue and digital I/O.

In general, any device providing an OPC server can be easily integrated since PVSS provides an OPC client: this is the case of WAGO I/O modules, the CERN recommended PLCs, and many other industrial devices.

GAS Systems

The gas systems of the different sub-detectors are being developed in the framework of the Gas Working Group (GWG). The GWG is also responsible for the control aspects and their integration into the framework.