The Modbus diagnostics supported by the Serial Card contain the PLC diagnostic register contents and the PLC run indicator. The Serial Card treats this data as 17 discrete bits of data. The first 16 bits correspond to the PLC diagnostics register information, and the seventeenth bit is the PLC run indicator. This information is retrieved from the Modbus device using function codes 8 and 17. For data mapping purposes, the Serial Card treats this data as if it were 17 coils or input status values. Therefore, the data is mapped to DeltaV data types exactly like coil and input status data are mapped.