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DPC31 HW

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DPC31 HW Description

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buffer, the display ‘U_Buffer_Cleared’ is set with ‘User_New_Dout command’ (refer to Table 5.2-8) and the

user receives the information that it is cleared data (substitute values).

5.2.7 Read_Inputs (SAP56)

The Read_Input message is accepted by the MAC only with request data length = 0, in the mode

‘Data_Exchange’, from any master. For this, DPS enters the corresponding validation values in ‘SAP56 of

the SAP_SCB’. In the other modes, the DPC31 responds with ‘no service activated’ (modes ‘Wait_Prm,

Wait_Cfg’) or ‘no resource’ (request data length # 0).

The exchange of the Read_Input buffer has been described previously. Between the initial call and the

repetition if there is a buffer change from ‘U’ -> ‘N’ -> ‘D’ (through User_New_Din command), the new input

data is sent at the repetition.

5.2.8 Read_Outputs (SAP57)

The Read_Output message is accepted by the MAC only with request data length = 0, in the mode

‘Data_Exchange’, from any master. For this, DPS enters the corresponding validation values in ‘SAP57 of

the SAP_SCB’. In the other modes, the DPC31 responds with ‘no service activated/no resource’.

The exchange of the Read_Output buffer has been described previously.

Between the initial call and the repetition if there is a buffer change from ‘N’ -> ‘U’ (through User_New_Dout

command), the new output data is sent at the repetition.

5.2.9 Get_Config (SAP59)

The Get_Config message is accepted in all modes. If the call message contains request data, the MAC

acknowledges with ‘no resource’.

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Siemens SPC3 Specifiche Pagina 35