Bus Parameters (DP)

1

The Slot Time indicates how long the DP master will wait for a response from the DP slave before it sends either a repetition or the next telegram.

2

The minimum Tsdr indicates the minimum length of time for which the DP slave will wait with a response. This time is set for all the DP slaves during the DP start-up (the value range is 11-255 bit periods). The minimum Tsdr must be smaller than the maximum Tsdr.

3

The maximum Tsdr indicates the maximum length of time for which the DP slave may wait with a response. This time is set according to the DP slave's GSD file entries. The maximum Tsdr must be smaller than the slot time.

4

The Max Retry limit indicates how often a telegram is resent, if the addressed device does not respond. A value of at least 1 should be set, to ensure that for acyclic telegrams the telegram is repeated at least once in the event of an error.

5

Since the Data_Exchange telegram is repeated cyclically, a value of 0 could be used for the repetition of the Data_Exchange telegram here, in order to keep the cycle relatively constant in equidistant mode, even if there is no response from a device.

However, in this case it would make sense to set the Features tab for the box such that lack of response of the slave would not lead to DATA EXCH being exited (see: Features). If a device has not responded, this is indicated by the DpState, which in this case is not 0 for one cycle.

6

A distinction can be made between master functionality (default) and multi-slave.

7

This button is used to optimize the bus parameters.

8

This button is used to set the standard bus parameters.