Slow control
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Table of contents
- 1. New ISTTOK slow control system
- 1.1. Intro
- 1.2. Team and responsabilities
- 1.3. System description
- 1.3.1. Gas injection system
- 1.3.2. Vacuum System
- 1.3.3. Liquid Metal Limiter
- 2. State machine description
- 2.1. Hardware Platform
- 2.1.1.1. Supervisor/Central Node
- 2.1.1.2. Local Control
- 2.2. Software Platform
- 2.2.1.1. Central Node
- 2.2.1.2. Local Control
- 2.3. Protocol for communication between dspics and PC in ISTTOK slow control
- 2.3.1.1.1. Examples: PIC -> PC
- 2.3.1.1.2. PC -> PIC
- 2.3.1.2. Table of words:
- 2.1. Hardware Platform
- 3. References
New ISTTOK slow control system
Intro
The new ISTTOK slow control system is designed to replace the former vaccum/power/slow timing system based is the EDWARDS controller
Team and responsabilities
- Horácio Fernandes (ISTTOK Leader)
- Bernardo Carvalho (Project Leader)
- Paulo Duarte (ISTTOK Session Leader, State Machine develpment)
- Tiago Pereira (dsPIC development, RS232 protocol/ Sensor Interface/ Wiring)
- Paulo F. Carvalho ( Epics Applications)
- Bruno Santos (Epics)
- Gonçalo Quintal (Epics, CSS Gui Panels)
System description
The slow system control consists of:
Gas injection system
Vacuum System
- Pfeiffer pressure gauges
The dsPic acquires the pressure value from the Pfeiffer gauge, with the Pfeiffer protocol working on RS485, and sends the pressure to a high level PC application.
Liquid Metal Limiter
State machine description
Hardware Platform
Supervisor/Central Node
One PC Controller
- Intel(R) Atom(TM) CPU 330 @ 1.60GHz, Dual Core, 1 Gbyte RAM, 4 RAM
- 4 Serial Ports
- IP addr:192.168.1.152 ( ISTTOK private network)
- Scientific Linux CERN 6 (SLC6) with MRG Realtime extensions
- Linux Kernel 3.2.33-rt50.66.el6rt.x86_64
- NTP time conected to IPFN Gps NTP/PPS server IP:10.136.236.255
Local Control
One or more dsPic board running an embedded firmware
-
Software Platform
All software stored in IPFN SVN server: http://metis.ipfn.ist.utl.pt/svn/cdaq/ISTTOK/
Central Node
EPICS v. 3.14.12.3 including modules:
- asyn4-21
- seq-2.1.11 http://www-csr.bessy.de/control/SoftDist/sequencer/index.html
CS-STUDIO
- CSS_EPICS_3.1.4 http://ics-web.sns.ornl.gov/css/products.html
Installed Scripts
- epicsenv.sh directory: /etc/profile.d/epicsenv.sh
- epicsCaRepeater directory: /etc/init.c/epicsCaRepeater
- service-startup directory: /opt/epics/bin/services/service-startup
- epicsIocLogServer directory: /etc/init.c/epicsIocLogServer
- epicsenv directory: /usr/bin/epicsenv
Local Control
Protocol for communication between dspics and PC in ISTTOK slow control
- all bytes are readable ASCII
- all messages all terminated with two bytes: \r\n (13 10)
- messages have variable length
- framing character for fields inside message is space (32)
- individual fields inside each message have variable length
- the last three characters before the terminator are the ASCII representation of the checksum of all other bytes, excluding the terminator
Examples:
PIC -> PC
VL01_1 VL02_1 VL03_0 TE01_150.9 TE02_80.1 UP_7200 PR01_1.3e-4 CKS\r\n
PC -> PIC
VL01_1 CKS\r\n
Table of words:
VL - Valve
TE - Temperature
UP - Uptime
PR - Pressure
References
"EPICS IOC module development and implementation for the ISTTOK machine subsystem operation and control"
Paulo Carvalho, André Duarte, Tiago Pereira, Bernardo Carvalho, Jorge Sousa, Horácio Fernandes, Carlos Correia, Bruno Gonçalves, Carlos Varandas
Fusion Engineering and Design 86 (2011) 1085–1090