Rockwell Automation T8017 Trusted Peer to Peer Communications - Manual (Page 20)

Trusted
TM
Communication Software Package T8017
Issue 10 Mar 08 PD-T8017 20
Figure 9 shows a display of the refresh status rack of the associated digital input board.
Figure 9 Input Board Status Display
Variable 1: TRUE = Input data is valid, i.e. refreshed within REFRESH_TMO
Variable 2-9: TRUE = Data has been refreshed within REFRESH_TMO by subnet 1-8, respectively.
This status is intended for detection of latent faults within a redundant network. The data is delivered
over all available programmed subnets simultaneously. If any of these variables goes FALSE for a
programmed subnet, then data has failed to arrive on that subnet within the REFRESH_TMO. The
variables for programmed subnets may be combined through an AND gate to provide an indication of
full redundancy on that particular data path.