Rockwell Automation SA3100 Distributed Power System Drv Config,Program - Manual (Page 56)

3-18 SA3100 Drive Configuration and Programming
UDC Module Fiber-Optic Link Status Register 88/1088
This register shows the current operating state of the fiber-optic link
to the PMI. The lower byte (bits 0-7) shows the actual link status
while the upper byte (bits 8-15) shows whether the communication
taking place is synchronized or not. Sug. Var. Name: N/A
Units: N/A
Range: N/A
Access: Read only
If the lower byte is equal to:
xx01H: the UDC module is waiting for a request from the PMI for an operating system.
xx02H: the UDC module is downloading an operating system to the PMI.
xx03H: the UDC module and the PMI are exchanging data.
xx06H: the external loopback test is being conducted on the fiber-optic link.
If the upper byte is equal to:
01xxH: the communication between the UDC module and the PMI is synchronized.
02xxH: the communication between the UDC module and the PMI is not synchronized.
UDC Module Transmitted Message Count Register 89/1089
This register contains the number of messages transmitted by the
UDC module. Sug. Var. Name: N/A
Units: Counts
Range: N/A
Access: Read only