CM0504 User Guide
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The•following•shows•a•typical•NPN•open•collector•sensor•connection:
•
Internal to product
Digital or frequency Input
Open
collector
Figure 10.5. Open collector sensor connection
The•following•shows•a•typical•PNP•open•collector•(also•called•open•emitter)•sensor•connection:
•
Internal to product
Digital or frequency Input
Open
collector
Figure 10.6. Open collector active high connection
10.5.2. Variable Resistance
Variable•resistance•sensors•change•impedance•to•represent•it’s•measured•value,•and•are•compatible•with•
analog•inputs.
Variable•resistance•sensors•are•typically•used•in•thermal•and•pressure•applications.•They•work•by•
changing•the•voltage•reading•on•the•sensor•according•to•changes•in•pressure•or•temperature•in•the•
application.
The•CM0504•cannot•measure•resistance•directly.•