Difference: Draft_DCS (r2 vs. r1)

-- MarioBragadireanu - 12 Oct 2014

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PANDA Detector Control System

PANDA DCS Technical Design

The present structure of PANDA experiment involves several sub-detectors and sub-systems (Fig.1). The Slow Controls (SC) of each PANDA sub-detector and sub-system are planned to be monitored and controlled from a supervisory software application.

PandaCentralDCS.pngPandaCentralDCS.png

In the past, an evaluation of SCADA several development packages, PVSS, LabView SCADA , EPICS, was performed by a PANDA slow controls subgroup and the EPICS package was selected to be the main SC software development tool. packages, PVSS, LabView, EPICS, was performed by a PANDA slow controls subgroup and the EPICS package was selected to be the main SC software development tool.

Due to the anticipated complexity of the whole PANDA SC DCS and the expected staged assembly of PANDA detector, the SC DCS system is highly needed to be modular and scalable. In order to accomplish this, each PANDA sub-detector or sub-system is envisaged to be basically autonomous but manageable from a supervisory layer.

The autonomy of each PANDA SC partition (Fig. 2) implies that the partition should be self-controllable. This means that, specific slow control software, tailored to configure, monitor and control the hardware devices belonging to the partition, is required. Moreover, the partition specific software must be capable to share data with the supervisory layer. PandaDCSPartition.png

In order to ensure compatible data sharing between The autonomy of each PANDA DCS partition (Fig. 2) implies that the SC supervisory layer partition should be self-controllable. This means that, specific slow control software, tailored to configure, monitor and SC control the hardware devices belonging to the partition, an EPICS Gateway is required to required. Moreover, the partition specific software must be implemented by each PANDA SC capable to share data with partition. Additionally, the above gateway supervisory layer. will provide access rights administration and subnet interface.

In order to ensure compatible data sharing between the SC supervisory layer and SC partition, an EPICS Process Variable Gateway is required to be implemented by each PANDA SC partition. Additionally, thePV Gateway will provide access rights administration and subnet interface.

The SC operation of each partition will be performed from a dedicated graphical user interface (GUI). The interface should ensure the accurate and safe operation of the partition hardware. The complete interface, or part of it, will be embedded in the PANDA supervisory software.

At the moment, the state of the art user interface to EPICS is supported by the Control System Studio (CSS) framework. The technical design of PANDA SC system is planned to provide a set of guidelines for naming conventions, and graphical interface look and feel, in order to guarantee the similarity of the independent developed modules and to simplify the integration.

The outcome of putting all the above requirements together is a PANDA DCS architecture based on a three-layer design – Supervisory, Control and Field layers. The highest level is the Supervisory one. The Control Layer is in the middle and it is the level where all the PANDA DCS partitions are connected. The Field Layer is embedded in each PANDA DCS Partition, and is made of all the devices and sensors used to monitor and control the sub-sytem.

PandaDCSLayers.png

Because the device driver software support in EPICS is limited, the software development tools used to control the lowermost layer (Field Layer) are at the free choice of the developer. The only constrain here is that the software must be integrated in the control layer with the EPICS system. However, the recommendation is that the developer, in the early stages of design, should try implement, were is possible, the same hardware and software, with EPICS support, realized by other PANDA sub-systems.

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