Profibus tab

Stations No.: Here, the PROFIBUS station address must be set for each slave. For some slaves, the station address cannot be set in the hardware, but only via the SetSlaveAddress service. In this case, the button "Set.." should be pressed. This will open a dialog, through which transmission of a SetSlaveAddress telegram can be triggered.

Watchdog: Activates the DP watchdog. If the slave does not receive a DP telegram for the duration of the watchdog time with the watchdog switched on, it will automatically exit the data exchange. The minimum watchdog time to be set depends on the DP cycle time, and should be larger than the value calculated by the following formula: Estimated-Cycle-Time * 10

For particularly critical outputs it is possible to set a DP watchdog time down to as little as 2 ms for DP slaves that support a watchdog base time of 1 ms (namely all Beckhoff slaves with the exception of the BK3000 and BK3100, and any third-party devices whose GSD file contains the entry "WD_Base_1ms_supp = 1"). The DP watchdog time should, however, be at least twice as long as the greater of the Cycle time and the Estimated cycle time (see the master's FC310x tab).

Ident No.: Here, the Ident number from the GSD file is displayed.

PrmData: Allows editing of the Profibus-specific parameter data. The values of the current parameter data are also displayed. The PrmData can usually be set as text (-> PrmData (text)) or for Beckhoff DP slaves partly via the "Beckhoff" tab

CfgData: The current configuration data (resulting from the attached modules or terminals) as well as their length is displayed.

Sync/Freeze: In operation mode DP/MC (equidistant) of the master, slaves can be operated with Sync and Freeze.

DPV1 Class 2: With FC310x, a DPV1 class 2 connection to a DPV1 slave can be activated. This is a good idea, for example, if the DP slave is in data exchange with another master, but should nevertheless be addressed acyclically by TwinCAT. The class 2 connection monitoring time is set via the timeout parameter (see chapter DPV1).

DP Class 2: "No Cyclic Connection" or "ReadOnly" should be selected under DP class 2, if the DP slave is in data exchange with another master, but should nevertheless be addressed acyclically by TwinCAT, or the DP inputs and outputs should be read cyclically. If "ReadOnly" is selected, then the modules are to be selected as in the case of the normal cyclic connection. They all, however, appear in the TwinCAT system with input variables, regardless of whether they are in fact input or output modules (ReadOnly only as from firmware version 3.00).

ResetSlave: With this button, provided TwinCAT has been started, cyclic data exchange with the DP slave can be disabled and re-established immediately (corresponds to a IO reset but only for the one slave).