EPICS Overview 25 August 2009 Matt Boyes [email protected] EPICS Overview Lecture 1 Matt...

EPICS Overview

25 August 2009 Matt Boyes [email protected]

EPICS Overview

Lecture 1Matt Boyes

EPICS Overview


Class OutlineLecture 1: Intro to EPICS

What is EPICSEPICS Channel AccessWhat is a PVWhat is a Database

Types of IOCs

LCLS Network DetailsChannel Access Permissions/SecurityLCLSHome

EPICS LCLS Environment SetupLCLSHome DisplaysDisplay Tips

EPICS Overview


Class Outline (cont.)Lecture 2: Diagnostics and tools

Channel ArchiverStripToolMessage LogScoreBPM Orbit DisplayIRMISMatlab GUIs

Correlation plots

Command Line ToolscainfocagetcaputCamonitorCWgetCWput

EPICS Overview


What is EPICSEPICS stands for Experimental Physics and Industrial Control System

A CollaborationMajor Collaborators

ANL (APS Accelerator, APS Beamlines, IPNS)

LANL

ORNL (SNS)

SLAC (SSRL, LCLS)

JLAB (CEBAF)

DESY

BESSY

PSI (SLS)

KEK

Diamond Light Source

EPICS Overview


What is EPICSA Software Toolkit

A Control System Architecture

5

EPICSClientClient

Server Server

CACA

CA CA

EPICS Overview


Channel Access

Channel Access protocol is the way EPICS communicates. Process Variable (PV) data is transferred between Servers and Clients.

CA Servers (IOCs)IOCs (Distributed)

Where PVs liveDatabase

ClientsEDM DisplaysStripToolProbeChannel ArchiverMatlabetc

EPICS Overview


EPICS CA Overview

Client StripTool Probe EDM Matlab Archiver

Server IOC IOC

Meter Power Supply Camera

SIOC

Channel Access

Based On Getting Started with EPICS Lecture Series “Introduction to Channel Access Clients”

Kenneth Evans, Jr.

EPICS Overview


Search and Connect Procedure

Client StripTool Probe EDM Matlab Archiver

Server IOC IOC

Meter Power Supply Camera

IOC

3. TCP Connection

Let’s talk !

1. UDP Broadcast Sequence

Who has it ?

Check Check CheckCheck

2. UDP Reply

I have it !

IOC

Based On Getting Started with EPICS Lecture Series “Introduction to Channel Access Clients”

Kenneth Evans, Jr.

EPICS Overview


Process Variable

A Process Variable (PV) is a named piece of data associated with the machine (e.g. status, readback, setpoint, parameter)

Examples of PV names and values:

LASR:IN20:196:PWR 27.8 uJVGCC:IN20:605:P 3.2e-08 torrBPMS:IN20:425:X1H -0.323 mmBEND:LI21:215:BACT 0.7684 kG-mVVPG:IN20:155:POSITION ‘OPEN’S3:DIPOLE:PS:setPoint 123.4 AmpsAPS:Mode ‘Stored Beam’BL3:HISTOGRAM {3, 8, 1, 2, 56, 44, 32, 43, 3, 5, 1}

Getting Started with EPICS Lecture SeriesIntroductory Session I

Ned Arnold

Examples of: LCLS Electron PV NamesExamples of: LCLS Electron PV Names

What is EPICS?

Details of the LCLS Electron PV naming convention can be found here:http://lcls-dev.slac.stanford.edu/tiki-index.php?page=LCLS+Naming+Conventions

EPICS Overview


What is EPICS?

Getting Started with EPICS Lecture SeriesIntroductory Session II

John Maclean

EPICS Overview


11

What do PV (records) do?Records are active, they do things

Get data from other records or from hardware

Perform calculations

Check values are in range and raise alarms

Put data to other records or to hardware

Activate or disable other records

Wait for hardware signals (interrupts)

What a record does depends upon its type and the values in its fields

A record does nothing until it is processed, it’s INVALIDINVALID


John Maclean

EPICS Overview


12

PV Record typesClassified into four general types

Input: e.g.

Analog In (AI)

Binary In (BI)

String In (SI)

Algorithm/control: e.g.

Calculation (CALC)

Subroutine (SUB)

General Subroutine (genSub)

Output: e.g.

Analog Out (AO)

Binary Out (BO)

Custom: e.g.

Beam Synchronous Acquisition (BSA)


John Maclean

EPICS Overview


13

EPICS Databases – What are they?A collection of one or more EPICS records of various types

Records can be interconnected and are used as building blocks to create applications

A data file that’s loaded into IOC memory at boot time

Channel access talks to the IOC memory copy of the database


John Maclean

EPICS Overview


14

EPICS IOCs – What are they?

IOC: Input Output Controller

Communicates with the hardware, other IOCs and clients

Were the EPICS PVs live

LCLS IOC Types

VME IOCs

VME: 3100/6100 (IOC)

Embedded: Coldfire (EIOC)

SoftIOCs: Linux process (SIOC)

EPICS Overview


15

IOC view of a recordrecord(ai, "BPMS:LI21:131:X") { field(DESC, "X Position") field(EGU, "mm") field(DTYP, "Raw Strip Signal") field(INP, "#C0 S14") field(FLNK, "BPMS:LI21:131:Y") field(PREC, "4") field(LOPR, "-12") field(HOPR, "+12")}

record(sub, "BEND:DMP1:400:BACT") { field(DESC, "Actual B") field(INAM, "mgntInitPoly") field(SNAM, "mgntReversePoly") field(INPA, "BEND:DMP1:400:BACT") field(INPB, "BEND:DMP1:400:POLYCOEF") field(INPC, "BEND:DMP1:400:POLYCOEF.A") field(EGU, "GeV/c") field(HOPR, "17.5") field(LOPR, "0.055") field(HIHI, "17.5") field(LOLO, "0.055") field(PREC, "7") field(BRSV, "INVALID") field(HHSV, "MAJOR") field(HSV, "MINOR") field(LSV, "MINOR") field(LLSV, "MAJOR") field(FLNK, "BEND:DMP1:400:BACTFO") field(HIGH, "17.5") field(LOW, "0.055") field(INPD, "BEND:DMP1:400:POLYCOEF.B") field(INPE, "BEND:DMP1:400:IACT MS") field(INPF, "BEND:DMP1:400:BDELTAS PP") field(INPG, "100")}


John Maclean

EPICS Overview


16

Putting it all together

Analog InProcTemp

EGU : deg C

VALINP

Temperature Sensor

IOC

Database

Analog to Digital Converter

0 – 100°C0 – 10V

8 bit ADC0 – 10V0 – 255 bits

EGUL: 0

EGUF: 100

HIGH: 51

Process

45.5°C 4.55V 116 bits

Channel Access Server

Normal Operation5 - 50°C

Channel Access ClientTell me about

ProcTemp

ProcTemp.VAL = 45.5 .EGU = deg C.STAT = Normal

45.5 deg C

51.5°C 5.15V 132 bits 51.5 deg C

ProcTemp.VAL = 51.5 .EGU = deg C.STAT = MAJOR


John Maclean

EPICS Overview


LCLS Controls System

LAVC

CA

SCCS PUBSAFS NFS

CVS

Staging System(backup)

IOCs lcls-opi03 lcls-opi04

lcls-opi01

lcls-srv01

lcls-opi02 mccfs2OPIs

lcls-daemon1 lcls-archeng

Filtering Router

PEPpx00

DMZ

lcls-prod02lcls-prod01 lcls-archsrv

LCLSDEVlcls-dev2 IOCs

WEBmccas0 NISmccora2

mccelogsunsrv00

lcls-builder

NIS WEB

REMEDY(Artemis)

Ernest and Jingchen, 04/15/08

desktops

opi00nas03

physics-elog

px01 mccas1

MCC

EPICS Overview


Important Network DetailsLCLS Controls System

LAVC

CA

SCCS PUBSAFS NFS

CVS

Staging System(backup)

IOCs lcls-opi03 lcls-opi04

lcls-opi01

lcls-srv01

lcls-opi02 mccfs2OPIs

lcls-daemon1 lcls-archeng

Filtering Router

PEPpx00

DMZ

lcls-prod02lcls-prod01 lcls-archsrv

LCLSDEVlcls-dev2 IOCs

WEBmccas0 NISmccora2

mccelogsunsrv00

lcls-builder

NIS WEB

REMEDY(Artemis)

Ernest and Jingchen, 04/15/08

desktops

opi00nas03

physics-elog

px01 mccas1

MCC

• LCLS DEV clients (lcls-dev2) can not access CA Network PVs

• LCLS DMZ clients (lcls-prod02) have read only access to CA Network PVs

• EPICS Environment automatically setup for group accounts on CA Network Computers (host=lcls-srv01 users={physics, acclegr, iocegr})

EPICS Overview


Channel

Access

Permissions/Security

PV Read Only Access from DMZ computers (lcls-prod02)

PV Write Access from CA computers (lcls-srv01, sunrays, MCC computers)

IOCs can further restrict read/write access by username and by computer name(eoicdesk only)

EPICS Overview


User Environment Setup

EPICS Overview


LCLSHomeTo start LCLSHome, type[mboyes@lcls-prod02:~]$ lclshome

Top display is summary status by subsystem vs locationComplex areas are further divided, check help for details

Important Alarms/severity should propagate up from lower sub displays

Summary Alarms can by bypassed on LCLSHOME, a * indicates a PV in that location is bypassed.

EPICS Overview


Display TipsSome helpful EDM tips

Middle Mouse Click on a PV will show the PV name. This can by dragged and dropped to copy/paste the PV name somewhere else.

Control + Middle Mouse Click on a PVA message window will appear with helpful PV info (cainfo)

Additional operations will append message window until use clears window.

HOST IOC (where PV exists) is displayed, only works on production hosts (lcls-srv01)

Does not apply to SoftIOCs running on a linux server.

GraphsRubber bandingto zoom

EPICS Overview


Display Tips (cont.)Some helpful EDM tips

Control + Shift + Middle Mouse Click on a PVBrings up submenu to send PV to

Probe

Plot History in Matlab Window

EPICS Overview


Your Homework before Lecture 2

Each person should:

Have a unix account

Have the EPICS environment a setup

See slide “User Environment Setup”

Be able to start lclshome on lcls-prod02

Optional:Be able to log in to lcls-srv01 with a group account:

acclegr

physics

EPICS Overview


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