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mapp Services V5.16

This function block uses the MpLink from an MpJ1939Transmit configuration.

This function block can be used to transmit a readable PGN. For additional information, see Transmitting and receiving information.

The PGN specified on input parameter "PGN" is queried by the function block. The numerical value of the PGN must be specified. The numerical value of a PGN can be taken from a J1939 database. This can be downloaded here , for example. The buffer for the PGN must be provided on "Data". How to create this buffer is explained in section Memory management.

The priority of the PGN must be specified on input "Priority". This can be different for each PGN. The priority of a PGN can be taken from a J1939 database. For PGN DTBI1, for example, the priority is 5.

The information specified on parameter "Data" is transmitted via a positive edge on input parameter "Transmit". To retransmit the desired PGN, another positive edge is required on "Transmit". The successful transmission is confirmed by "CommandDone = TRUE".

It is important to note that PGNs must be transmitted within a certain cycle time. For more information, see Timing.

Input parameter "DataLength" specifies the size of data buffer "Data".

If the PGN has been transmitted and a new PGN should be transmitted, the function block must be disabled via "Enable" = FALSE and re-enabled via "Enable" = TRUE. After re-enabling of the function block, a new PGN can be transmitted.

It is important to note that a PGN can have limit values, scaling and an offset. These must be taken into account when further processing the PGN. The limit values, offset or scaling of a PGN can be taken from a J1939 database that can be downloaded here.