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Your systems Engineer decided to assign Modbus discrete input numbers 100, 101 and 102 to the three switches and the other discrete inputs to 103 through 118.

CPU_BOOLEAN  AppDITbl[16];
CPU_BOOLEAN  AppSwStart;
CPU_BOOLEAN  AppSwStop;
CPU_BOOLEAN  AppSwReset;
 
CPU_BOOLEAN  MB_DIRd (CPU_INT16U di, CPU_INT16U *perr)
{
    *perr = MODBUS_ERR_NONE;
    switch (di) {
        case 100:
   return (AppSwStart);
 
        case 101:
   return (AppSwStop);
 
        case 102:
   return (AppSwReset);
 
        case 103:
        case 104:
        case 105:
        case 106:
        case 107:
        case 108:
        case 109:
        case 110:
        case 111:
        case 112:
        case 113:
        case 114:
        case 115:
        case 116:
        case 117:
        case 118:
   return (AppDITbl[di – 103]);
 
        default:
   *perr = MODBUS_ERR_RANGE;
   return (FALSE);
    }
}