Instruction Manual

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Communication Software Package T8017

Issue 10 Mar 08 PD-T8017 17

Figure 6 shows a display of the refresh status rack of the associated analogue input board.

Figure 6 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.