The Arriel 2B1 carries 2 fully digital and independant lines within one DECU. If one fails, there will be no degredation of any engine performance as the other channel will take over with full authority. Upon shutdown the pilot will get an amber GOV light to inform him one of the lines were/is unhappy with something. It will give him a full flight report and for the technicians a maintenance screen is available listing fault codes with a list of posssible components causing the problem in sequence of probability. The code refers to the Maintenance manual were the fault finding steps are laid out step by step. Also, the 2B1 does it's own power checks and compute your margins. The DECU and VEMD is biased towards atmospheric conditions so the displayed fLI(first limit indicator) already takes atmospheric conditions into account. The vEMD also allow you to enter weight, alt, temp and will give you your IGE and oGE weight limits before and during flight.
If both of the lines fail you have a 3rd system called eBCAU which will regulate N2. The pilot will get a red GOV and the procedure is a caution to not do radical collective changes as the EBCAU does not read the collective as the 2 DECU channels does but it will govern the engine.
The nice thing about the 2B1 are the alternators driven by the engine(N1 signals). These power the engine and DECU so even if you have a full aircraft electrical system failure, the engine will retain full authority.