daveswerld
Member
Hi all. I am in the process of converting as existing S5 948 PLC to a S7-416 processor for the expanded IO. In doing so, but maintaining everything running as much as possible, I am going to transfer controls to the S7 in blocks, primarily based on the IO racks that can be moved.
Apparently, multiple profibus masters can exist on the same physical profibus network. I have the S5 assigned as master <1> and the S7 assigned as master <5>. Once I put both PLC's on the same network, one or the other crashes (bus faults, PLC QVC faults, and bus faults on the cards). It seems that which ever PLC was the last one on the network gets the IO. The controls function properly if the S5 is on the bus alone. Connecting the S7 allows the IO to continue functioning, but generates a fault (EXTF and DP1) on the S7. Disconnecting the S5 at the 308C causes the S7 faults to clear, but IO is locked up (no code called yet in S7). The only way to get controls and IO functions back is to disconnect the DP from the S7 and reconnect the S5.
I am obviously confused here as to how multiple masters work. The service and support site has been less than helpful, and Johnson City will call back.
Any Ideas?
Thanks
Apparently, multiple profibus masters can exist on the same physical profibus network. I have the S5 assigned as master <1> and the S7 assigned as master <5>. Once I put both PLC's on the same network, one or the other crashes (bus faults, PLC QVC faults, and bus faults on the cards). It seems that which ever PLC was the last one on the network gets the IO. The controls function properly if the S5 is on the bus alone. Connecting the S7 allows the IO to continue functioning, but generates a fault (EXTF and DP1) on the S7. Disconnecting the S5 at the 308C causes the S7 faults to clear, but IO is locked up (no code called yet in S7). The only way to get controls and IO functions back is to disconnect the DP from the S7 and reconnect the S5.
I am obviously confused here as to how multiple masters work. The service and support site has been less than helpful, and Johnson City will call back.
Any Ideas?
Thanks