The monitoring system of the electromagnetic calorimeter (ECAL) of the BM@N (Baryonic Matter at Nuclotron) spectrometer is presented. The system is based on a plastic scintillator with wavelength shifter Fibers. Detection of light is carried out by silicon photodetectors MPPC (Multi-Pixel Photon Counter), insensitive to the magnetic field. The efficiency of minimal ionizing particles registration is close to 100%. Work has been performed at the Veksler and Baldin Laboratory of Physics High Energies, Joint Institute for Nuclear Research.
$^1$Joint Institute for Nuclear Research\
$^2$State university "Dubna"
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