Position detection module and position detection system thereof

A position detection module, comprising:

• a first output port configured to output a first detection signal;
• a second output port configured to output a first position signal;
• a third output port configured to output a second detection signal;
• and
• a fourth output port configured to output a second position signal,
• a first position detector, comprising the first output port and the second output port, wherein the first position detector, disposed to an encoding disc, detects a rotation of the encoding disc to output the first position signal;
• a second position detector, comprising the third output port and the fourth output port, wherein the second position detector, disposed to the encoding disc, detects the rotation of the encoding disc to output the second position signal;
• wherein when the first detection signal and the second detection signal respectively are at a first level, this indicates that the first position detector and the second position detector are in a normal state;
• when the first detection signal and the second detection signal respectively are at a second level, this indicates that the first position detector and the second position detector are in an abnormal state;
• a difference between the first position signal and the second position signal indicates the rotation state of the encoding disc.