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UBS - Input type question


Tozz
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Question

I am using a couple of UBS sensors for a variety of applications. For example I have one connected to a twilight switch and a RAD-MOD (radar sensor, somewhat like a PIR, but much more sensitive). I am having issues with both of these, which seem to originate in the UBS.

 

I was reading the manual and suspect I need to change parameter 3 and 4, but I dont understand the differences. Parameter 3 and 4 valid options are:

 

0 Normally Closed

1 Normally Open

2 Monostable

3 Bistable

 

It is not clear to me what the difference is in how UBS handles these settings:

 

I understand Normally Open and Normally closed (NC is opposite of NO).

 

- A NO contact is low when the input is open, and high when the input is closed.

- A NC contact is low when the input is closed, and high when the input is open.

 

But then comes monostable and bistable. I learned from Google that a monostable relay is a relay that goes back to the start position when the current to the coil is removed.This sounds to me like a regular NO/NC contact.

Bistable is a relay that stays in its position, after the current to the coil is removed. This also sounds like a regular NO/NC contact to me.

 

Can someone explain what the UBS does differently when I change parameter 3 / 4?

 

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@Tozz My understanding is thiis. The NO and NC settings lets you change  how UBS reacts. ie  A alarm system may give a closed circuit to indicate its armed or it may give a open circuit to indicate this. I have used this to change indication of alarm condition rather then changing  alarm settings Where as the monostable/bistable setting is if you are monitering a pushbutton or a toggle switch.

 

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  • Thanks, but it's not really clear to me yet.

     

    You say, an alarm system may give a close circuit to indicate it's armed, or an open circuit. I understand that. Lets say Alarm system A is NO and closed with armed, alarm system B is NC and open when armed. Now I get that you might want to change parameter 3/4 into value 1 or 0, depending on the system.

     

    But when would you need value 3 (monostable) or 4 (bistable)? Lets take your example of a toggle switch.

     

    If I would connect a toggle switch to UBS, and parameter 3/4 is set to 1 (NO):

     

    - if i toggle the switch to on position, input 1 becomes closed and an alarm is triggered

    - if I toggle the switch again to off position, input 1 becomes open and the alarm is cleared.

     

    Now, lets say I set parameter 3/4 to "toggle switch". From what I understand from it, nothing really changes:

     

    - if i toggle the switch to on position, input 1 becomes closed and an alarm is triggered

    - if I toggle the switch again to off position, input 1 becomes open and the alarm is cleared.

     

    Same for a pushbutton (momentary switch):

     

    - If I press the switch, input 1 becomes closed and opens as soon as I release the button. The UBS will trigger an alarm and that alarm will clear when I release the button.

     

    If seems to me that whatever the value of parameter 3 or 4, all the UBS does is:

    - Send an alarm when the input is closed (unless set to NC, then its the opposite)

    - Clear the alarm when the input is opened (unless set to no, then its the opposite0

     

    What am i missing?

     

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