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How to determine what value of PID output represents 100% of duty cycle of pulse generator?
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You will never be able to stabilize the ball with just the proportional control. The ball will...
In theory everything sounds ok, but when I try to implement it in practice it simply doesn't work.
...
John Smith,
I'm assuming that you are using a pulse width modulation type control for the fan....
Are most automation equipment broken down into finite state machine logic?
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By Vladimir E. Zyubin on 5 January, 2013 - 12:20 pm -
Bruce: Thank you very much for your detailed explanation on PLC basics, but my question was about...
An SFC is made up of transitions and actions - a check for a particular result will trigger a...
By Vladimir E. Zyubin on 4 January, 2013 - 1:25 am -
> there needs to be a success path and a fail path,
Agreed. Could you explain, which way do...
By Ken E on 3 January, 2013 - 4:56 pm -
I agree. I joke with a colleague of mine that we tend to code 80% for the error conditions and 20%...
I find that using an SFC approach to the design stage of a complex sequence can highlight all the...
By Vladimir E. Zyubin on 2 January, 2013 - 2:21 pm -
> This is just my opinion but I feel that doing complex work in SFC or flowchart
> is...
By Steve Myres on 2 January, 2013 - 2:06 pm -
I don't like function block, but I do like SFC. You have a lot less logic active in any given...
By Ken E on 2 January, 2013 - 9:24 am -
This is just my opinion but I feel that doing complex work in SFC or flowchart is tedious and...
By Vladimir E. Zyubin on 1 January, 2013 - 2:45 pm -
> For example, a breaker can have 4 states, if you have 8 breakers that is 4^8 or 65536....
Hello,
I think we are getting to my answer. I think what I am hearing, is that in other...
By Brian on 29 December, 2012 - 11:47 am -
All the discussions that I have read can likely be solved by using the Schneider Electric Unity Pro...
Hello,
I am absolutely familiar with doing state graphs. I implement them using structs in...
By Ron Davis on 26 December, 2012 - 4:19 pm -
Tim,
As others have described, there are a number of ways of implementing state logic in PLCs....
By Ken E on 26 December, 2012 - 8:19 am -
I personally program PLCs like a step by step procedure for the most part. On older style PLCs I...
Hi,
My former employer and regular advertiser on this site Control Technology Corporation uses a...
By Curt Wuollet on 24 December, 2012 - 7:09 pm -
GE even had, (has?) a "state logic" programming language. But, state machines can be...
By William Sturm on 24 December, 2012 - 10:05 am -
Most PLC programs use combinations of bits as state. Using bits as state is kind of subtle, but it...
Looking for the best method for using an object oriented programming in Step 7
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a pity nobody answered this interesting post.
And a pity these weeks I'm too busy to write a...
Error in write function of VB code
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By automationcorner on 4 January, 2013 - 7:40 am -
Hello,
I recommend you to use a tested and documented ActiveX.Visit www.automationcorner.com...
reading data memory from OMRON PLC with VB.
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By Mark on 4 January, 2013 - 12:34 am -
Hello,
I cannot help you with the VB code but, I can tell you OMRON uses two protocols named...
Can modbus be efficiently developed using vhdl
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> am having sparten 3 and vertex II pro. how to configure slaves if i consider
> fpga as...
By sookshma Adiga on 26 December, 2012 - 11:52 pm -
Thank you for the reply..
am having sparten 3 and vertex II pro. how to configure slaves if i...
Automatic control of the Rotary Atomizer used in Painting equipment's using PID controller in Siemens S7 for three different bells
GE MARK V Manuals
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Dear Bambang,
I would also appreciate if you could send the link/files for our reference at
...
Do we need two type of Interposing relays in Relay panel for controlling Motor & getting feedback?
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Hello,
I couldn't agree with your comment on the DCS/PLC DO.
Please note that 24 V DC...
By jk on 29 December, 2012 - 5:13 am -
dear,
the situation is i want to control the level of a tank with 3 motors 2 are in operation...
By jk on 27 December, 2012 - 4:50 am -
dear,
the situation is i want to control the level of a tank with 3 motors 2 are in operation...
We have SIL-3 certified Honeywell Safety Manager installed at site. A total of 6 each SMs are installed in redundant configuration i.e on controller as well as I/O levels. Since commissioning we have been facing frequent I/O module failures.
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By jk on 29 December, 2012 - 5:24 am -
i had faced same thing with c300. Honeywell recommend that:
check which card goes to bad...
best practice to secure modbus TCP
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Hello,
I did find this device, Tofino, that does provide modbus filtering over IP...I am...
Looking for a free modbus driver that will work with .NET.
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By Stephen McLain on 28 December, 2012 - 4:23 pm -
Hey there. I'm the original author of this thread. I'll go ahead and provide an update.
After...
Where and how to write topic and item names to access specific I/O addresses in S7 program
Looking for information about a plc from Carra
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> Well, you might try www.carra.it
Couldn't find any information on carra.it, So I tried to...
By Walt Boyes on 19 December, 2012 - 8:34 am -
Well, you might try www.carra.it
Walt
Walt Boyes, FInstMC, Chartered Measurement and Control...
Trouble trying to send data from controllogix 5555 to slc 505
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By Gerald Beaudoin on 20 December, 2012 - 1:44 pm -
Always worked well here too. In the CTLX MSG instruction, configure for a SLC Write. On the Comm...
By Steve Myres on 20 December, 2012 - 9:21 am -
I haven't had any issues with that so it at least can work. It seems like you should be able to...
By Bob Peterson on 20 December, 2012 - 7:39 am -
I have never had any trouble with this kind of configuration. There are plenty of knowledge base...
By Barrese, Robert J on 20 December, 2012 - 7:18 am -
Raul,
You will have to check the firmware revision of the 5/05. Make sure one or both of the...
How to calculate total time scan for data fetched over MODBUS
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By Brad Stemp on 20 December, 2012 - 12:19 am -
I assume this is a HPM you are talking about....
The Honeywell serial FTA is pretty fast...
KEYENCE Ladder Builder For KV Communication error
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By Ken E on 19 December, 2012 - 8:33 am -
I don't think this is particularly fair. I certainly don't agree with the software support that...
By m.gwinner on 19 December, 2012 - 6:13 am -
after rewiring a complete machine for a friend and programming the PLC 4 times, I went to change a...
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