Normally Open Contact Numbers
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An alternate notation for form a is spst no.
Normally open contact numbers. Of these contact forms the following are particularly common. In other words when voltage is applied to the relay contactor terminals this contact closes. Energizing it and switching it on will close the contact causing it to allow current flow. Normally open is a contact that does not flow current in its normal state.
When the energizing force is present the contact will close. 87a normally closed contact. 85 relay coil 86 relay coil 87 common contact. This is simply the state that the contact is in when something else is not affecting it.
A relay contact in the ladder diagram can be normally open or normally closed and there is no limit to the number of contacts a relay can have. If it is a high limit such as a temperature alarm then the current temperature is below the limit. If it is a switch then it is off. Out coils a plc output is really just an internal relay with a physical connection that can supply electrical power to control an external load.
87b normally open contact. Normally open no contacts allow current when the relay or contactor is energized. If it is a relay then it is not energized. Form a contacts make contacts are normally open contacts.
When voltage is applied this contact opens and interrupts current.
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