adccommunitymod (AutomationDirect) asked a question.
Created Date: June 17,2013
Created By: PlasticDoug
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I am kind of a newb when it comes to PLC programming, but I am working on a brewing project that I would like to use the Click along with the C0-04THM card. I am looking at controlling two heating elements with two separate thermocouples. I really just need on/off with a dead band. Will I be able to achieve this? Has anyone used the new thermocouple cards yet? I have look for a tutorial or some type of information on programming the thermocouple aspect of it but have come up dry. Any help would be appreciated. Thanks, Doug
Created Date: June 17,2013
Created by: bcarlton
For a start go to the free videos for the Click (find the Click tab). Make sure to download the Click software and install it. It includes the user manual which is more about install and initial setup than programming. The temperature will appear as a Floating Point (DF) variable. Use comparison instructions to decide if heating is called for or not. Use two comparison points to establish a dead-band.
Created Date: June 17,2013
Created by: Philip Potts
Doug,
Yes, you will be able to achieve your goal with the Click and the thermocouple input card. You will need to decide what type of thermocouple you want to use. The most common type of thermocouple is a type J and and type K. The difference between the two is the temperature range each can handle. Either one should be OK for brewing beer. What type of heat are you going to use? My guess would be a heating element. If so you will need a SSR (Solid State Relay) to pass power to the element and the Click to control the SSR.
Give more details about your project and what you want the program to do and you will receive all the help you will need.
Good luck.
Created Date: June 18,2013
Created by: PlasticDoug
Phillip,
Thank you for the reply. That is what I thought that I could do with it. I wanted to make sure before I order it.
Created Date: June 24,2013
Created by: CReese
For temperatures in the range of brewing, I would recommend a thermistor or digital solid-state sensor such as a 1wire DS18b20.
Thermocouples are only worth the amplification and calibration when you absolutely must have the temperature range, in my experience.
C
Created Date: June 24,2013
Created by: Cap
CReese
What have you used to get that serial data of DS 18b20 the into a PLC?.. I 've checked these things out before, and have interface hardware made up to read into a PC.. have you fit one to a PLC??..
Cap
Created Date: June 24,2013
Created by: CReese
I have not used them with PLCs. I have tackled this app in a number of different ways, and none involved a PLC. PC control, RPi control, and Arduino are all legitimate options.
If you already have a PLC or are married to the idea, you can find 1wire to serial converters that should do the trick.
If you have an analog card, you could always use a voltage divider with a thermistor as well.
Created Date: June 24,2013
Created by: CReese
Here you go:
$14
http://www.canton-electronics.com/modbus-rtu-temperature-monitor-module-ds18b20-rs485-rs232-plc-network-485-tvs-arduino-kits-p-484.html
Pick up a few of these:
http://www.ebay.com/itm/K1BO-10pcs-DS18b20-Waterproof-Temperature-Sensors-Temperature-Transducer-/251269383134?pt=LH_DefaultDomain_0&hash=item3a80d283de
And you 're golden. Great part about these guys is you can put as many as you want on the same bus. 64-bit unique ROM on-board. See here for connectivity:
http://interfaceinnovations.org/onewireproducts.html
C
Created Date: June 17,2013
Created by: PlasticDoug
I am kind of a newb when it comes to PLC programming, but I am working on a brewing project that I would like to use the Click along with the C0-04THM card. I am looking at controlling two heating elements with two separate thermocouples. I really just need on/off with a dead band. Will I be able to achieve this?
Has anyone used the new thermocouple cards yet? I have look for a tutorial or some type of information on programming the thermocouple aspect of it but have come up dry. Any help would be appreciated.
Thanks,
Doug