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Question:

Relay instructions to write a group of normally open, a group of conversion,

Relay instructions to write a group of normally open, a group of conversion, "a group of conversion" What is the meaning of the meaning of normally closed it?

Answer:

A group of normally open; is in an open state, in fact, is a single-pole single-throw switch: A group of switches; that is, this group of switches have three contacts, Z, A, B, Z known as the knife, A, B called throw. That is, this set of switches single pole double throw; knife Z, throw A, throw B. That is, from A to B.
May 9, 2017
  Normally open: refers to the relay in the state without power action; that is not connected. Normally closed;     Conversion: refers to the relay in the power action after the knife Z can be converted from the A-side to the B-side, static when the normally closed (connected) state, that is, Z, A contact.
May 9, 2017
Knife (moving contact): often connected to the active (power) side;     Throw (static contact): often connected to the passive (power) side. (Throw, or: bit, road, point)
May 9, 2017

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