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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.


Code Block
languagecpp
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);
    }
}

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