Multiple XC10s No Contact or Multiple Addresses Intermittent Issues

We are having issues with a system that has 2 XC10's on the same expansion bus. This is the first system we used multiple XC10's and have been having issues since we got it online.The XC10's expansion bus is connected to a MC43.

Changing different settings seems to have some affect but I feel like no matter how we change settings this issue is still around it just might not popup as much.

We either get a multiple address error or a no contact error. When we get the no contact error if we look online the device is working however any outputs that were active are faulted and we need to cycle them to get it going. This seems normal for a no contact issue. We see these errors on startup and occasionally while running.

Here are settings I changed. When I changed them I cycle power 25 times to try to gauge where we need things set. The settings I played with are the MC43 cycle time, expansion bus divider, delaying and staggering the 'Enable' for the XC10's. And I recorded the occurrences of each message.

There is a pattern but I'm having a hard time decided where to set things. We currently have the system set with settings that didn't give us problems during the test, but during further testing we occasional see them.

20 ms MC43 

Expansion bus divider =  2(40mS)

Cycle util = 11% 

XC10[0] Enable delay = 0000 

XC10[1] Enable delay = 0000               

0 - No Contacts     

0 - XC10 Multiple addresses

10 ms MC43 

Expansion bus divider =  2(20mS) 

cycle util = 21% 

XC10[0] Enable delay = 0000 

XC10[1] Enable delay = 0000                

0 - No Contacts     

2 - XC10 -Multiple addresses

10 ms MC43 

Expansion bus divider =  2(20mS) 

cycle util = 21% 

XC10[0] Enable delay = 5000 

XC10[1] Enable delay = 0000             

0 - No Contacts     

2 - XC10 -Multiple addresses

10 ms MC43 

Expansion bus divider =  9(90mS) 

cycle util = 21% 

XC10[0] Enable delay = 0000 

XC10[1] Enable delay = 0000                

0 - No Contacts     

0 - XC10 -Multiple addresses

 5 ms MC43 

Expansion bus divider =  2(10mS) 

cycle util = 41% 

XC10[0] Enable delay = 0000 

XC10[1] Enable delay = 0000                

0 - No Contacts     

4 - XC10 -Multiple addresses

 5 ms MC43 

Expansion bus divider =  2(10mS) 

cycle util = 41% 

XC10[0] Enable delay = 5000 

XC10[1] Enable delay = 0000               

0 - No Contacts     

3 - XC10 -Multiple addresses

  5 ms MC43 

Expansion bus divider = 10(50mS) , 

cycle util = 41%  

XC10[0] Enable delay = 0000  

XC10[1] Enable delay = 0000                

1(1) - No Contacts     

0 - XC10 -Multiple addresses

5 ms MC43 

Expansion bus divider = 10(50mS) 

cycle util = 41% 

XC10[0] Enable delay = 4000 

XC10[1] Enable delay = 8000                

1(1)  - No Contacts     

0 - XC10 -Multiple addresses