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Stopping distance from stop sensor


 

I want to add stop sensors to my layout using reed switches. But I am confused about where exactly to locate them in my stopping blocks.?

Does the loco stop immediately (ie use brake) when the sensor is hit or does it decelerate to stop? ?

also, since each loco has its own speed profile, how do i locate the sensor so that they all stop at the same point in the block?
?
--
+===============================
|. Vimal Parikh
+------------------------------------------
| JMRI version: 5.8+
| Java Version: 17.0.10
| Command Station: DCC-EX version 5.0.7
|.Host: MacBook Pro Sonoma 14.6.1
+===============================


 

On Tue, Jan 7, 2025 at 04:31 PM, <tour-mayors.0e@...> wrote:
since each loco has its own speed profile, how do i locate the sensor so that they all stop at the same point in the block?
I'd say that with different train configurations, getting them to ramping down to stop on a precise point would be best accomplished with two detections. The first to start the ramp down and the next to stop it.
Speed Profiling is just a good estimate for the automation system to calculate where to stop but it's still subject to other variables. I know with warrants, it doesn't go into stopping sensors as the software can adjust the speed profile for a given train using its current performance.
?
--
H.O. Australia (Layout in Progress)
Digikeijs DR5000 LocoNet
JMRI v5.8 DecoderPro/Warrants/CPE/SML/LogixNG
Windows 10


 

I am using dispatcher (not warrants) and have block sensors. ?So will following work?
?
1. ?Ramp down the speed on block entry to 10%
2. Stop the train on stop sensor.?

my question is still: ?will the train stop immediately when the stop sensor fires or is there a deceleration?
--
+===============================
|. Vimal Parikh
+------------------------------------------
| JMRI version: 5.8+
| Java Version: 17.0.10
| Command Station: DCC-EX version 5.0.7
|.Host: MacBook Pro Sonoma 14.6.1
+===============================


 

On Wed, Jan 8, 2025 at 07:54 AM, <tour-mayors.0e@...> wrote:
I am using dispatcher (not warrants) and have block sensors. ?So will following work?
?
1. ?Ramp down the speed on block entry to 10%
2. Stop the train on stop sensor.?

my question is still: ?will the train stop immediately when the stop sensor fires or is there a deceleration?
Yep I know, I was just illustrating how speed profiles are still subject to other variables.
My understanding is a train that needs to stop should ramp down on entering the section and slow enough to stop (Throttle 0) when the stop sensor is activated. As long as the distance isn't too short it should slow enough in time to stop.?
I have read posts with issues where the train has overrun the stop sensor. This can be due to any momentum set or signal speeds on approach.
--
H.O. Australia (Layout in Progress)
Digikeijs DR5000 LocoNet
JMRI v5.8 DecoderPro/Warrants/CPE/SML/LogixNG
Windows 10


 

On entry to a section or block where the train has to stop it will decrease the speed to what ever selection you made in the dispatcher options. When the stopping sensor fires it will set the speed to zero, so momentum may be applied by the decoder. To stop immediately have an action to estop on stop, that will kill any momentum.
?
Steve G.
?


 

Thanks, Steve.?
but pardon my ignorance but where do I specify the action to use estop instead of plain stop?

Is it done in the transit table?
--
+===============================
|. Vimal Parikh
+------------------------------------------
| JMRI version: 5.8+
| Java Version: 17.0.10
| Command Station: DCC-EX version 5.0.7
|.Host: MacBook Pro Sonoma 14.6.1
+===============================


 

In the transit definition there are transit section actions for each section in a transit.
One of? the available? triggers is "on stop". So on stop set estop.
Steve G.
?
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