I have a very simple configuration, as shown in this Layout Editor screenshot:

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I have used the Discover option on signal masts 409 and 410, and it correctly identified 410 and 411 respectively as the "next" signal. If I click on the icon for signal 411, I see that signal 410 reacts properly. In other words, If 411 is green or yellow then 410 is green, but if 411 is red, then 410 goes yellow.? Perfect!

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However, if I click on the icon for signal 410, it has no effect on signal 409 which just stays green (or whatever aspect it happens to be showing).

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I have tried deleting all of the signal mast logic and discovering again. I can't see any difference in the resultant settings, except that 410 to 411 has the Active check box ticked, whereas 409 to 410 does not. That feels like it is going to be related to the problem, but I can't manually change the value and, so far as I can see, the documentation doesn't discuss that check box (pointers welcome if I have missed it).

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All three masts are BR-2003-WE. Masts 409 and 410 are both made from "real" three aspect signal heads, whereas 411 is a virtual mast - not sure if that makes any difference.

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Sorry if it's a daft question as I make my way slowly into the complexities of signal heads and masts.

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Thanks,

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Nick

Nick,

The active checkbox indicates if there is an available route.

Since 409 to 410 is not active, you need to click on Edit and review the detail SML configuration. ?Make sure that 410 is the destination. ?Verify the options.

The Blocks tab should have one automatic block and no manual block selected. ?The rest of the tabs should be empty.

Dave Sand

Thanks Dave,

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I've looked at the two lots of settings and they appear to be identical.??

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However, I have just run my startup script (which interrogates all the detectors to make sure all of the sensors correctly show as [at the moment] unoccupied).? Without changing anything else, signal mast 409 has now started to behave as expected. So, not entirely sure why - but thanks for the support and sorry for wasting your time.

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Thanks, Nick