Important general considerations
Great care must be taken when adding datalogging to railway signalling systems.
The most serious hazard to be considered is the possibility of feeding out a voltage and current that is sufficient to falsely energise a railway signalling relay.
The second most serious is accidentally providing an electrical path through a logger from one part of the signalling system to another, or to earth.
Analogue and digital inputs of the SA-SSI must never be directly connected to
- track circuit tails
- rails
- BX110/B50/B24 power supplies
- any other live signalling circuits
SIL 0 software
Software in this product is designed to SIL 0. It is not a safety critical system and data from an SA380TX must never be used to make safety related decisions.
Solid State Interlocking Monitoring
The SA-SSI is designed primarily for the monitoring of Solid State Interlocking's. Below is a typical wiring diagram for such an application.
