Features tab
Data_Exchange poll rate [only FC310x]
A different polling rate (Divider) can be set for each slave. Divider 1 means that the slave is polled during each cycle, Divider 2 means every 2nd cycle, etc. The modulo will distribute slaves with dividers greater than 1 across different cycles in order to minimize the maximum cycle time (divider 2 and modulo 0 means that the slave is polled every even-numbered cycle, divider 2 and modulo 1 means that the slave is polled every oddly-numbered cycle). (see the section on Slave Prioritization/Multiple DP Cycles).
Additional Data_Exchange samples
It is possible to run a number of DP cycles within one task cycle. It is then optionally possible for each slave to be supplied with different output data in each DP cycle, and for the input data from each of those DP cycles to be transferred to the controller. In this case, there is an individual set of variables for each DP cycle (see the section on Slave Prioritization/Multiple DP Cycles).
NoAnswer reaction
You can specify, for each slave, whether it should remain in the Data Exch, despite responding incorrectly or not at all. In this case (Stay in Data-Exch), data exchange is only exited if the slave has never responded correctly within the address monitoring time (provided the watchdog (see the box's Profibus tab) is activated, otherwise data exchange is only terminated once the slave has not responded correctly 65,535 times) (see the Error Reactions section).
Restart behavior
It is possible to specify for each slave whether, after leaving Data-Exch, it should automatically start up again, or should remain in the Wait-Prm state (see the Error Reactions section).
Reaction of the master
For each slave you can specify whether its exit of Data Exch results in stopping of PROFIBUS cycle (FC310x: all slaves exit the data exchange and switch to Wait-Prm, restart only through IO reset or restarting of the TwinCAT system; EL6731: EL switches to PREOP state, restart through switching to OP state) (see section Error Reactions).
Changes of the input data
For each slave it can be specified whether, on exiting of Data Exch (DpState not equal 0), its input data should be set to 0 or remain unchanged (see the Error Reactions section).
acyclic services
The number of parallel ADS services to one box can be set here.