The PDPMV1 operating state is stored in the MVIxxPDPMV1.Status.Fieldbus.FB_op_state tag:
00 = Offline
40 = Stop
80 = Clear
C0 = Operate
To determine slave status, the MVIxxPDPMV1.Status.Fieldbus.FB_Slave_Data_xfer array contains a bitmap of all the PROFIBUS slaves currently in communication with the PDPMV1 master. The data type is SINTs, so each element in this array contains bits representing 8 PROFIBUS addresses.
For example, if bits 0 and 3 are set in MVIxxPDPMV1.Status.Fieldbus.FB_Slave_Data_xfer, slave addresses 0 and 3 are communicating successfully. Slave_Data_xfer would contain the booleans representing addresses 8-15, Slave_Data_xfer would contain the status bits for addresses 16-23, etc. A simple XIC or other RSLogix function can be used to monitor the communication status of any slave attached to the PDPMV1 master.
Note that with the MVI56-PDPMV1 using the Legacy AOI and with the MVI69-PDPMV1 these status tags are continually updated automatically. If using the MVI56-PDPMV1 with the Flex AOI, the toggling the MVI56PDPMV1.Command.GetStatus tag is required to trigger an update for this or any other status information.