X20 system modules • X20 interface module communication • X20IF2181-2
X20 system User's Manual 3.10
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4.23.25.9.3 X20HB8884 with hub expansion modules
Expanding the X20HB8884 with two active X20HB2885 hub modules eliminates the need to connect external hubs.
Two hot-swap capable modules are required so that devices on the out-port can continue operating uninterrupted
even when a hub is replaced. Additionally, a redundant supply voltage for the system can be easily implemented
using two X20 supply modules.
HB2885
HB2885
HB8884
Hub
Hub
PS PS
PL1
PL2
PL1
PL2
Out
Figure 597: Function principle of the X20HB8884 link selector with hub expansion modules
Managing node
X20HB8884 with 1x X20HB2880
X20HB8884 with 2x X20HB2885
POWERLINK
Network 2
POWERLINK
Network 1
POWERLINK
Network 1
POWERLINK
Network 2
Figure 598: X20HB8884 with hub expansion modules
Summary of Contents for X20 System
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