1. Design of Control System
for ALICE EMCal readout
electronics
--- Subhashis Hazarika
2. Project Aim:
1.
To program an intermediate server in between ALICE
EMCal readout and trigger hardware and SCADA control
software used by the DCS (Detector Control System).
2.
Developing high-level control software in the SCADA
environment (PVSS).
4. Intermediate Server:
It has been programmed in C language based on the standard DIM
library.
Various DIM functionalities like DIS_ADD_SERVICE,
DIS_UPDATE_SERVICE etc. have been used.
The server program continuously readout the current registry values
and also keeps checking if there is any new commands in queue to be
executed.
For most of the TRU controllers registry values are read twice in a
row as a double proof measure. If the values are different in each
read, updates are not published by the server.
Command of the form “ONOFF 0x11” will set the 0th and 4th bits of
the RCU’s onoff register.
5. PVSS
DIM Library
C code for server
Rcu-sh scripts
There is double readout for
most of the TRU controllers
Hardware
6. compare()
Readback struct
DIM service
Contains
the
registry
values read
from the
hardware
cmnd struct
Does value of the structure
element match ?
NO: cmnd executed
YES: cmnd not executed
read
from h/w
Contains
the
registry DIM command
values to
be set.
Send via
command
write to h/w
Hardware
7.
8. HighHigh-level software in PVSS:
The aim is to create core objects in SCADA, link those to
DIM commands and services provided by the low-level
intermediate server
And to build intuitive user interface above those objects.
The JCOP (Joint Controls Project) Framework has been
used to hook up the PVSS with the intermediate DIM
server to transport commands and services from it.
The PVSS system acts as the DIM client by subscribing to
the services and commands published by the intermediate
low-level server
9. PVSS Data-Points where created to store the actual data
and used to develop various front-end features.
The data-points are created maintaining a hierarchical
relation among the different hardware elements.
Super-Module
RCUs
TRUs
FEEs
10.
11. PVSS panel development:
PVSS panel development involves building friendly
graphical user interfaces to display the status of the
different hardware of the Super Module and also to monitor
them with ease.
Two panels have been made, one to display information of
the RCU and the other one for TRU
