Bus parameter (DP)...

"Slot-Time [tbit]" text box

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.

"min. Tsdr [tbit]" text box

The min. 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 min. Tsdr must be smaller than the max. Tsdr.

"max. Tsdr [tbit]" text box

The max. 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 max. Tsdr must be smaller than the slot time.

"Gap-Factor" text box

The GAP factor determines how often the GAP update is performed (if it is enabled). The interval between two GAP update cycles is Gap-Factor x Target-Rot.-T..

"Max Retry-Limit" text box

The Max-Retry-Limit specifies how often a telegram should be repeated, if the device addressed does not answer. The minimum value should be 1, so that, in case of an error, there will be at least one repeat for acyclic telegrams.

"Max Retry-Limit (DX)" text box

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. In this case, the Features tab should be used to set the behavior such that a non-response of the slave does not result in termination of the data exchange. The fact that a device has not responded is apparent from DpState, which would not be equal 0 for one cycle.

"Quiet-Time [tbit]" text box

"Setup-Time [tbit]" text box

"Target-Rot.-T. [tbit]" text box

"HSA" text box

The HSA specifies the highest active address up to which the GAP update is carried out (assuming it is active). Address 126 is the highest address that can be set.

"Min-Slave-Int. [ms]" text box

The Min-Slave-Int. specifies the minimum cycle time with which the DP StartUp telegrams are sent to the DP slaves. The interval is determined from the settings in the GSD file.

"Data-Control-T. [ms]" text box

"PROFIBUS-Mode"

The "PROFIBUS Mode" radio button can be used to set whether the device is to operate as a PROFIBUS master device or as a PROFIBUS slave device. If the options are grayed out, only the mode that is displayed is supported.

"PROFIBUS-Mode Master" option

If the option "PROFIBUS-Mode Master" is selected, the device operates as a PROFIBUS master device.

"PROFIBUS-Mode Multi-Slave" option

If the option "PROFIBUS-Mode Multi-Slave" is selected, the device operates as a PROFIBUS slave device.

"Redundancy-Mode" check box

Here you can set the redundancy mode for the DP master. If the Redundancy-Mode check box is checked, the DP master only "listens" on the bus.

"GAP-Update (Multi-Master)" check box

The GAP update asks all stations up to HSA at intervals to confirm their presence. It can be enabled or disabled. The GAP update is relevant only for multi-master mode. In single-master mode it increases PROFIBUS cycle jitter. and is therefore switched off by default.

"Optimize Bus Parameter" button

The "Optimize Bus Parameter" button is used to set optimized bus parameters.

"Default Bus Parameter" button

The "Default Bus Parameter" button is used to set default bus parameters.

"Okay" button

The "Okay" button applies the settings to the configuration and closes the dialog.

"Cancel" button

The "Cancel" button closes the dialog without applying the settings to the configuration.