What's the deal with Omron PLC without output voltage?

Create Date: 2024-8-30 12:03:23|Source: Omron/Omron

1. The indicator light at the output of the PLC is on, indicating that the DO point of the PLC has been closed; 、

2. The DO point of PLC is equivalent to a dry contact switch, imagine that an on/off switch on a line is closed, if you measure the voltage on both sides of this switch, there will be no voltage, thinking that the switch itself is not a load, and there is no resistance of course there is no voltage division;

3. In the case that the indicator light at the output end of the PLC is not lit, you measure the voltage at the output end of the PLC, and imagine that in the circuit of a circuit, the DO point of the PLC is equivalent to a switch, at this time the switch is disconnected, the control circuit does not form a loop, and you measure the output end is equivalent to measuring the voltage of the entire load circuit, that is, the general 24VDC;

4. Generally, without disassembling the PLC line, the method of measuring the voltage is used to judge whether there is an output at the DO point of the PLC, if there is an output, the voltage is 0VDC, and if there is no output, the voltage is 24VDC.

Solution(s):

1. Check the output relay of the external circuit and PLC

2. Change the relay

3. Connect the counterpart power supply

4. Replace the output point
What's the deal with Omron PLC without output voltage?

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