The ELMB was designed and
developed by ATLAS. It comes in the form of a credit-card sized board
and it comprises several digital I/O lines, which can be fully programmed
by the (advanced) user, as well as a multiplexed
64-channels ADC, with 16+7-bit
resolution, which can be used from the SCADA system.
The board can either be
directly plugged onto the subdetector front-end electronics, or onto a
general-purpose motherboard, which adapts the I/O signals. It has a
tolerance (with safety factors) to radiation up to about 5 Gy and
3·1010 neutrons/cm2 for a period of 10 years and to a magnetic
field up to 1.5 T.
All the documentation on the
ELMB and motherboard (MB), including the schematics and pin
descriptions of all the connectors, are available at:
ELMB ATLAS info page
The COMPASS experiment uses
ELMBs to control slowly varying parameters, like temperatures,
atmospheric pressure, humidities, etc, and also measurements of low
voltages, magnetic fields, gas flows, etc.
Each ELMB module has 64
channels, 16 bit ADC; digital: 8 bits in, 16 bits out; CANopen
software and a user program up to 100Kb can be added.
Each ELMB needs an ELMB
Motherboard, DIN rail box, CAN connector, digital I/O connectors,
16 x DIL sockets for signal adapters, 4 x 34 3M pin connectors for analog
sensors; and also signal adapters.
The details of the ELMB system used in
COMPASS can be found