ABB FPBA-01 Manuel d'utilisateur télécharger pdf (Page 64)

Communication

Default SAP (SAP 0) (Data_Exchange)

Allows the master to send output data to a slave station and to

simultaneously request input data from the same station.

In addition to Default SAP, any master can read the I/O data of any

slave at any time using the “Read_Inputs” (SAP 56) and

“Read_Outputs” (SAP 57) telegrams (see Figure 13 on page 63).

These telegrams have otherwise the same structure as the cyclic

Data_Exchange telegram, but include the DSAP and SSAP bytes.

In these telegrams, the MSB of the DA and SA bytes will be set to

1 to indicate that a DSAP/SSAP byte follows in the telegram

header.

Outp_Data (Output Data)

DU length: 4 to 28 bytes (depending on the selected PPO message/

Standard telegram type)

Inp_Data (Input Data)

DU length: 4 to 28 bytes (depending on the selected PPO message/

Standard telegram type)

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 125 126

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ABB FPBA-01 Manuel d'utilisateur Page 64