The Scheme of Slow Control The Scheme of Slow Control System in BESIIISystem in BESIII

Xie Xiaoxi Gao Cuishan

2002.9.17

ⅠⅠ. The general prospect of the . The general prospect of the slow control and Environmental slow control and Environmental

Monitoring in BESMonitoring in BES

Both slow control system and environmental monitoring are very important and indispensable in the new BES system.

The slow control system must meet the high-level demands of the overall design, overall environment and management in the new BES.

The slow control system , which is numerous and complicated, is mainly applied in experiment area and sub-detectors in BESⅢ. It will play an important role during the operational period of DAQ in the future.

This system is composed of 3 main systems

temperature and humidity monitoring

gas system monitoring

controlling high-voltage system.

There are more than 14 kinds of physical parameters and 3000 channels of signals need to be collected and measured. Important parameters related both to the physics analysis and operation of BESⅢ will be stored in the operational database.

Parts of these parameters will be sent to online computer system via network communication to be stored in permanent media.

ⅡⅡ. The main objects . The main objects and Functions of and Functions of

the BES the BESⅢⅢ monitors monitors and controls for and controls for

slow control system slow control system

The main objects include temperature

humidity

monitor and control of the mass flow meter for gas providing systemsystem

control and monitor for HV

DC

AC

magnet and magnetic field

dangerous gas

radiation monitor

T-H control and monitor of hall and control room

safety interlock and so on.

ⅢⅢ.The place of slow control .The place of slow control system in online system system in online system

Event Display Histogram Display

Slow Control

1 100M Switch

Farm Supervisor

1000M Switch

Online

Run Control

IV.Overview of the task architecture of the slow IV.Overview of the task architecture of the slow control system for BEScontrol system for BESⅢⅢ

HVControl

DatabaseEditor

SubDetectorControl

ErrorLogger

SubDetecto

rMonito

r

running running running running

Slow Control Devices and Sensors (about 3000 channels)

running

GasSystem

Tem HumControl

Radiation Monitor

running running

Displays

Files

Slow Control Database

DAQ Data Stream

ⅤⅤ.Two kinds of bus scheme .Two kinds of bus scheme of data acquisitionof data acquisition

The primitive bus scheme of

data acquisition is

USB/one wire bus

Lab window/PXI

The USB/one wire bus scheme can be applied in all the special facilities that can convert the physical parameters to voltage or electric current.

Those facilities which appended with one of these bus interface: such as GPIB 、 VME 、 VXI 、 RS232 、 CAMAC and so on can adopt the Labwindow/CVI software and NI multichannel card which is plugged in PC.

VI.The block diagram of slow control system architectureVI.The block diagram of slow control system architecture Sensor Detector

Patrol meter

HUB

PC

100M SWITCH

P C

SCXI

Gas

H VCAEN SY1527

HUB

H V CAEN SY1527

H V CAEN SY1527

PXI

On Line

SC1 hardware

SC2 DAQ

SC3 Software

SC4 on lineon line

USB USBUSB

PC

VII.Client-Server diagram VII.Client-Server diagram

VIII.Some results have been obtainedVIII.Some results have been obtained

The research of “one wire bus”

About 70% of the 3000 channels of signal could be resolved by “one wire bus” scheme in BES Ⅲslow control system.

we have implemented temperature/humidity monitoring system with 84 nodes for temperature and 4 nodes for humidity in BESⅡ.

Design for hardware and software of USB interface device.we have finished the design for hardware of USB/CAMAC crate controller, programmed drivers based on USB1.1 of CCU-USB and application program of USB-PC, using C51/VC++6.0/VB6.0.CCU-USB have been successfully used in the check system of shower counter of BES

and scintillation counter hodoscope for tⅡesting BESⅢ muon detecter.

The scheme of monitoring of gas system in The scheme of monitoring of gas system in BES slow control systemⅢBES slow control systemⅢ

Primary scheme of high-voltage monitoring Primary scheme of high-voltage monitoring and control systemand control system

All high-voltage modules will adopt SY1527 of CAEN

The modules can be connected with PCI interface card in PC via cables

Software of slow control system will adopt the program language of C++

Use one independent PC

The block diagram of high-voltage monitor The block diagram of high-voltage monitor system in slow control system system in slow control system

Thanks!