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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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Mini PLC with analogue input
Does anyone have any experience with any of the following controllers?
Siemens "Logo" IDEC Smart Relay Telemecanique "Zelio" Mitsubishi "Alpha" I'm particularly interested in the stability of the ADC if I use a 0-10V dc input signal. Being a complete PLC novice, I'd welcome any comments on good/bad experiences with different makes. Thanks |
#2
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Mini PLC with analogue input
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#3
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Mini PLC with analogue input
cupra wrote:
What are you planning to use it for? A process signal in the range 0-10VDC is input to the controller. The controller compares the input signal against a high setpoint and a low setpoint. If the input is below the low setpoint, a relay output energises. If the input is between the low and high setpoint, the relay is de-energised. If the input is greater than the high setpoint, the relay energises. The response of the relay should be time delayed (between 0 and 5 seconds) to prevent temporary changes in the input affecting the output. I would have to program the controller so that the setpoints and time delay could be adjusted from the front panel using a LCD display. The power supply needs to be 24VDC. |
#4
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Mini PLC with analogue input
wrote: cupra wrote: What are you planning to use it for? A process signal in the range 0-10VDC is input to the controller. The controller compares the input signal against a high setpoint and a low setpoint. If the input is below the low setpoint, a relay output energises. If the input is between the low and high setpoint, the relay is de-energised. If the input is greater than the high setpoint, the relay energises. The response of the relay should be time delayed (between 0 and 5 seconds) to prevent temporary changes in the input affecting the output. I would have to program the controller so that the setpoints and time delay could be adjusted from the front panel using a LCD display. The power supply needs to be 24VDC. You can get dedicated setpoint/temperature controllers (Omron/Redlion to name but two) that do this for you without all the faff. |
#6
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Mini PLC with analogue input
Phil wrote:
wrote: Does anyone have any experience with any of the following controllers? Siemens "Logo" IDEC Smart Relay Telemecanique "Zelio" Mitsubishi "Alpha" I'm particularly interested in the stability of the ADC if I use a 0-10V dc input signal. Being a complete PLC novice, I'd welcome any comments on good/bad experiences with different makes. Thanks Oh - if you insist on using a sledgehammer to crack a nut then the Mitsi is the most straightforward. I've no experience with the IDEC but its name sounds much more like what you need.... Right. Thats the sort of thing I would have done with a quad opamp, 6 resistors and a capacitor. |
#7
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Mini PLC with analogue input
Phil wrote:
You can get dedicated setpoint/temperature controllers (Omron/Redlion to name but two) that do this for you without all the faff. Thanks, but I don't really want a setpoint controller. The dedicated product I require is a trip amplifier with user-adjustable setpoints and response time. |
#8
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Mini PLC with analogue input
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#9
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Mini PLC with analogue input
Right. Thats the sort of thing I would have done with a quad opamp, 6
resistors and a capacitor. Indeed. Personally, I would also use hysteresis, rather than time delay to avoid cycling. Christian. |
#11
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Mini PLC with analogue input
wrote in message oups.com... Phil wrote: You can get dedicated setpoint/temperature controllers (Omron/Redlion to name but two) that do this for you without all the faff. Thanks, but I don't really want a setpoint controller. The dedicated product I require is a trip amplifier with user-adjustable setpoints and response time. What are you controlling? A cylinder? |
#12
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Mini PLC with analogue input
Doctor Drivel wrote: wrote in message oups.com... Phil wrote: You can get dedicated setpoint/temperature controllers (Omron/Redlion to name but two) that do this for you without all the faff. Thanks, but I don't really want a setpoint controller. The dedicated product I require is a trip amplifier with user-adjustable setpoints and response time. What are you controlling? A cylinder? It might be a cube, or a pyramid. These are easier as they don't roll away. A sphere is a real bugger to control. MBQ |
#13
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Mini PLC with analogue input
In article ,
Christian McArdle wrote: Indeed. Personally, I would also use hysteresis, rather than time delay to avoid cycling. And don't have independantly-adjustable Lower and Upper trip points.... otherwise they can be crossed over, so that the Upper is lower than the Lower. Better to have (say) a Lower trip setting and a Window size setting, plus a clamp so that Lower+Window does not exceed 10V. Note: The OP has a similar thread in sci.electronics.design. -- Tony Williams. |
#14
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Mini PLC with analogue input
Tony Williams wrote:
Note: The OP has a similar thread in sci.electronics.design. Yeah, I tried to post the same thread to more than one group in Google Groups ("separate multiple groups with commas") but it didn't work for me. Don't know if you have to have a space either side of the comma or something... So I had to rewrite my post and put it in sci.electronics.design Not very neat but there you go. |
#16
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Mini PLC with analogue input
"The Natural Philosopher" wrote in message ... wrote: Tony Williams wrote: Note: The OP has a similar thread in sci.electronics.design. Yeah, I tried to post the same thread to more than one group in Google Groups ("separate multiple groups with commas") but it didn't work for me. Don't know if you have to have a space either side of the comma or something... So I had to rewrite my post and put it in sci.electronics.design Not very neat but there you go. How about installing a decent newsreader BEFORE attempting electronic design? Like me he could just use Outlook Express. His ISP Nildram seem to have a newsfeed so really no excuse! |
#17
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Mini PLC with analogue input
wrote in message oups.com... Does anyone have any experience with any of the following controllers? Siemens "Logo" IDEC Smart Relay Telemecanique "Zelio" Mitsubishi "Alpha" I'm particularly interested in the stability of the ADC if I use a 0-10V dc input signal. Being a complete PLC novice, I'd welcome any comments on good/bad experiences with different makes. Thanks Another one for your list is the Crouzet Millennium range. I have used these - both their mains and 24V volt range for various control projects including domestic (heating, lights, ventilation etc). Very easy to program. I don't have any specific info on the performance of the ADC (only available on the 24V version) but their UK office are very helpful with advice. see www.crouzet.co.uk. Chris |
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