(lb_fail == 00 and (lb_status == 2 or lb_status == 3 or lb_status == 6
or lb_status ==7)) or voltage > 400 or voltage < 190 etc.

reason_bitA == 0001b when (lb_fail == 00 and (lb_status == 2))
reason_bit == 0010b when (lb_fail == 00 and (lb_status == 3))
reason_bit == 0011b when (lb_fail == 00 and (lb_status == 6)) and so on.

if(Fail_safe_A1 ==1)   // Fail_safe_A1 corresponds to battery pack 1
{
  if (lb_fail ==0 & lb_status == 2)
     cout << "reason_bitA1 = 0001" << endl;
  if (lb_fail ==0 & lb_status == 3)
     cout << "reason_bitA1 = 0010" << endl;
  if (lb_fail ==0 & lb_status == 2)
     cout << "reason_bitA1 = 0001" << endl;
}and so on.