LNL CMS M.Biasotto, Padova, 24 aprile 2002 1 Farm monitoring Massimo Biasotto - LNL.
LNL 1 SLOW CONTROLS FOR CMS DRIFT TUBE CHAMBERS M. Bellato, L. Castellani INFN Sezione di Padova.
-
Upload
britton-hill -
Category
Documents
-
view
220 -
download
0
Transcript of LNL 1 SLOW CONTROLS FOR CMS DRIFT TUBE CHAMBERS M. Bellato, L. Castellani INFN Sezione di Padova.
LNL
1
SLOW CONTROLS FOR CMS DRIFT TUBE CHAMBERS
M. Bellato, L. CastellaniINFN Sezione di Padova
LNL
2M. Bellato, L. Castellani INFN - Padova
DT SLOW CONTROLS (DTSC)
LNL
3M. Bellato, L. Castellani INFN - Padova
DTSC COMPONENTS –1
• CONTROL BOARD– Close to DTBX chambers– Housed in cooled minicrates– Microprocessor based– External world I/F via serial
optical link(s)
LNL
4M. Bellato, L. Castellani INFN - Padova
DTSC COMPONENTS - 2
• SERIAL LINKS– One direct link from each
control board to counting room
– One direct link from half wheel control board to counting room
– One daisy chained link from sector collector to control boards (half wheel)
– One local link for maintenance
LNL
5M. Bellato, L. Castellani INFN - Padova
DTSC COMPONENTS - 3
• SLOW CONTROL MASTER– Sits in the
counting room
– 250 RS232 optical connections
– Houses the DCS interface
LNL
6M. Bellato, L. Castellani INFN - Padova
CONTROL BOARD FUNCTIONALITY
LNL
7M. Bellato, L. Castellani INFN - Padova
DTCCB - GOAL
•Clock distribution•Test Pulse signals distribution•Distribution and Readout of analog signals•Distribution and Readout of control signals•Temperature monitoring•Trigger Board and Readout Board ASICs setup and housekeeping
LNL
8M. Bellato, L. Castellani INFN - Padova
DTCCB – CLOCK DISTRIBUTION
• 40 MHZ LHC clock(s) via a TTCrx chip
• Low skew ( < 1ns) clock tree network to Trigger Boards, Server Boards and Readout Boards
• Decoding of TTC signals
LNL
9M. Bellato, L. Castellani INFN - Padova
DTCCB – Test Pulse Signals Distribution
• Programmable test pulse generation during orbit gap via TTC TEST signal
• Only orthogonal tracks• Programmable delay
LNL
10M. Bellato, L. Castellani INFN - Padova
DTCCB - Distribution and Readout of analog signals
• One 8 inputs ADC and one DAC
• Monitor of Power Supply lines for front-end boards
• Monitor of Power Supply lines for minicrate boards
• Readout of pressure values in the chamber
• Set of operational parameters in the front-end boards (threshold, bias,…)
• Readout of various temperatures in the chamber and in the minicrate
LNL
11M. Bellato, L. Castellani INFN - Padova
DTCCB – Distribution and Readout of control signals
• On/Off to different boards and to sections of the board itself
• 3 I2C ports for front-end boards, RPC and alignment system
• Voltage regulators FAULT signal detection
• Test pulse sequence control
LNL
12M. Bellato, L. Castellani INFN - Padova
DTCCB – ASICs Interface
• JTAG I/F for programming the Trigger Board and Readout Board
• Independent JTAG chains for the Trigger Board and Readout Board
• 4 bit addressable JTAG bus (max. 16 boards)
• Fast Parallel I/F for accessing Trigger Board (e.g. loading of lookup tables, etc..)– Shares the Trigger
Data Path
LNL
13
DTCCB LAYOUT
LNL
14
COMMUNICATION CHANNELS
• Optical asynchronous RS232 channel to each control board
• Four-fibre cables connect two minicrates each
• Daisy-chained RS485 channel for each half wheel– RS485 -> RS232
conversion done on Sector Collector Control Board
– Backup communication channel
• Local RS232 port for service and maintenance
LNL
15M. Bellato, L. Castellani INFN - Padova
SLOW CONTROL MASTER –1
• 250 asynchronous RS232 optical channels
• Software flow control• Deep transmit and
receive fifos– Increase latency– Decrease interrupt
rate to crate controller
• DCS Interface
LNL
16M. Bellato, L. Castellani INFN - Padova
SLOW CONTROL MASTER –2
Choice of technology– CompactPCI
• One 6U crate with 21 slots or two 6U crates with 10 slots
• 16 boards with 16 ports each• Optical connectors both on
front and rear side• Requires an intelligent
controller– Might run a diskless OS
(VxWorks, LynxOS,..)– Might run Win NT/2k with
DCS stuff• Might be operated with an
MXI controller from a PC
LNL
17M. Bellato, L. Castellani INFN - Padova
SOFTWARE
Needed :• Firmware for Control Board
– Only a very preliminary version exists– A basic version under development at CIEMAT
• Software driver for RS232 Uarts on the Slow Control Master
• Bridge for communicating with SCADA control systems
• DCS Interface
LNL
18M. Bellato, L. Castellani INFN - Padova
STATUS
• Control board– Few prototypes working– Final version expected in Q2 2002 (TTCrx delay)
• Serial connections– Choice of optical transceivers done– 600 pieces procured (Q4 2001)
• Slow Control Master– Choice of technology done– First board prototype being assembled now
• Software– Very preliminary version of CCB firmware existing– UART driver not existing– SCADA bridge available from DCS people– DCS interface not existing