All Questions
Tagged with plc opto-isolator
12
questions
1
vote
0
answers
26
views
Arrangement of isolated variable DC input
I design isolated DC input for industrial applications that can possibly work from 12 to 24 V.
I add a 5.1 V Zener for over-voltage protection, a capacitor for filtering, and TVS for surge production.
...
- 343
0
votes
0
answers
212
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PLC output optoisolation with mosfet output
I'm wondering if this circuit i've made is correct.
Basically i want to separate PLC transistor outputs from loads.
I need 500mA output current for LEDs but also for relays etc.
PLC and loads are ...
- 1
0
votes
1
answer
464
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24V I/O (PLC) to 3.3V interface with opto and PCF8574
I am more of a software guy, and I want to make sure my design works before sending it off to fabrication.
I need to interface with 24V PLC I/Os. I want a simple design for now, as I can add ...
2
votes
2
answers
1k
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Using an optocoupler to separate a 4-20 mA loop
I have a PLC that is powered with 3.3 V and a sensor powered with 12 V that outputs a 4-20 mA signal. In order to allow the signal to be readable by my PLC while isolating the current in the 12 V loop ...
- 53
2
votes
4
answers
929
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How can I control an input of a Siemens PLC with a 4N25 optocoupler?
I need to turn on/off an input of a Siemens PLC controlled by an external output of another machine.
I used an optocoupler because I need to isolate both circuits.
I have not been able to make this ...
- 21
0
votes
3
answers
973
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Zero crossing detector output to another optocoupler
I will use the configuration below to build a zero crossing detector to connect to a PLC.
I will change the output voltage to 24VDC and the correspondig resistor to 50K.
The problem is that the input ...
0
votes
1
answer
718
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Rise time of 6N136 opto-coupler
I am trying to use below circuit for convert 24VDC high speed pulse to 5VDC pulse that can interface to a stepper driver IC.
I have used 6N136 opto-coupler and according to its datasheet it can handle ...
- 871
1
vote
2
answers
3k
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24V signal to drive led
I have a PLC which gives 24V DC output. I would like to drive an external LED using 24V.
Is this the correct way to drive an led?
Which is the right method let me know any changes needed.
simulate ...
- 23
0
votes
1
answer
2k
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Optocoupler H22A2 driving a PLC input
See Optocouplers and Solid-State Relays: Application Examples, example 2.
I have existing H22A2 optocouplers that I am trying to run 12 VDC through to get a PLC input to turn on and off. I am using a ...
- 1
0
votes
2
answers
949
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How can I use half-wave rectified 120VAC to activate a PLC input?
I am working with a CLICK PLC with the C0-08NA 120VAC input module.
According to the documentation, the C0-08NA's equivalent input circuit looks like this:
A device I need to interface with is ...
- 2,696
0
votes
1
answer
844
views
Using an optocoupler to tap into digital PLC signals
How can i design a circuit for tapping digital DC signals from PLCs?
I desire to create a circuit with a MCU which can be attached to a PLC signal in the range 0-24V and log the signals on the MCU. I ...
- 125
2
votes
2
answers
3k
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Opto Coupler output voltage drop when connected to PLC
I have an input of pulse width 5 ms and which is fed to a Buffer IC and then the output of the buffer is FED to an opto isolator whose collector is pulled with a pull up of 7.5k resistor with an 24 V ...
- 149