If you want to use a capacitor to further reduce the power consumption, then I suggest a 0.022uF capacitor and a series resistor of at least 10K. I am aware that the pin spacing and package width cant be much less in order to maintain isolation. So I would use two 100K 0.25W series resistors. Its a 4-pin opto-isolator with opto-triac output. 1mA is enough provided you don't use too low a value of pullup resistor on the other side of the opto coupler. Type: 24V to 5V Channel:8 Maximum Conversion Frequency: 20KH This is an 8 channel one-way transmission digital signal converter When connecting the PLC. Opto-Isolated I/O Board offers a compact & convenient way to interface industrial type inputs/outputs to your microcontroller boards, Signal transmission. It isn't necessary to run the opto coupler anywhere near 10mA of current. Also, any transients on the mains will result in current surges through the opto coupler. 1kV/us, 50V CMR, Schmitt trigger output, DIP-8 Keys: opto coupler schmitt output Datasheet. When you switch the 240V mains on and the capacitor charges, you will get a 300mA surge through the opto coupler if the mains voltage happens to be near the peak part of the cycle. Description: Dual-channel digital isolator,1.8 to 5V, 150Mbs, 3kV. When the 220V voltage is normal, it output. When connecting the PLC input, the PLCs COM terminal is connected to the 24V power supply, the input is connected to signal outputs S1-S8 of the board, optocoupler GND is connected to the power supply negative. This module allows you to use a low level signal to control a higher level voltage. The 1K resistor suggested in that thread is IMO far too low a value. This is an 8 channel one-way transmission digital signal converter. If it is a pulse signal, please note that the limit of 817 is below 4KHZ, please do not use this module for control signals greater than 4KHZ, which will not work properly.To avoid having to use a high wattage resistor I have connected a capacitor and resistor in series as outlined in the thread How to detect power failure? - Project Guidance - Arduino Forum using the reactance of the capacitor to drop the voltage across the input of the PS2505. Item Type: Optocoupler Isolation BoardMaterial: PCBDriver Signal Voltage: 3.6-24VOutput Voltage Range: 3.6-30V (output current depends on the specific situation, but the maximum power is not exceed 10MA, the total power is constant, the voltage and current are inversely proportional) 3TURN ON CONTROLLED TERMINAL: Can realize 3.3V or 5V control interface of 3.6-24V voltage level, after the control terminal is turned on, the controlled terminal will also be turned on 4DRIVE VARIOUS OCCASION: Optical isolation has strong interference resistant ability, which can drive high power transistors, MOS tubes and other occasion that require high voltage drive, and can also directly drive low power 24V relays to work 5EXCELLENT PCB: Good quality PCB materials possess reliability and miniaturization, good maintenance and interchangeability Transistor Output Optocouplers Optocoupler 16-pin SSOP PS2801C-4-F3-A Renesas. Isolation Voltage Output Type Current Transfer Ratio - Min Current Transfer Ratio - Max. Mouser offers inventory, pricing, & datasheets for 4 Channel Transistor Output Optocouplers. 1HIGH LEVEL OR PULL DOWN OUTPUT: Whether the output terminal is high level output or pull down output can be realized through the jumper cap 2SIMULTANEOUS CONTROL DIFFERENT VOLTAGES: The 4 channels of 817 on the board are independent, which can realize simultaneous control of different voltages, etc. 4 Channel Transistor Output Optocouplers are available at Mouser Electronics.
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