3-Channel Optocoupler Isolation Module AC 220V Testing Module No PCB Holder .
Function: test whether AC 220V is existed;when there is 220V,optocoupler can be conductive to ground;otherwise,it is not conductive.
Output High/Low Level:can directly connect with SCM IO interface to test,voltage is 3-5V.
Adaptive to connect with PLC,compatible to almost all PLC input.
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