Puyu 2 Channel Relay Module / Expansion Board / Bi-directional Optocoupler Isolation / Low level triggered /24V

Description

Module Description fault-tolerant design, even if the control line is broken, the relay will not operate; the power indicator (red), 2-way relay status indicator (blue) 7, interface design, user-friendly, all interfaces can be drawn through terminals connect directly, very convenient has four fixed bolt hole for easy installation Module interface Module control terminal: 5-wire interface, all interfaces are terminal blocks, user-friendly wiring 1, DC +: external DC power supply negative (there is 5V, 12V and 24V modules to choose from) 2, DC-: an external DC power supply negative VREF: optically isolated control end of the reference ground.           If the high level control: This signal should be connected to the negative terminal of the power supply in the user control panel           If the low-level control: This signal should be connected to the positive power supply in the user control panel 4, CH1-CH2: relay control interface,           If VREF tied to power supply: This port is high (relative to VREF) relay           VREF to the positive supply: This port is low (relative to VREF) relay NO1 - NO2: relay normally open interface, the relay becomes vacant before the pull shorted with COM COM1 - COM2: relay common interface NC1 - NC2: Relay NC interface, the relay shorted together with COM, pull vacant