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 for the 2004 Run can be found here.