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Thermal Overload
The threads that wouldn't die...
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
- PC reliability?
- Windows, real time
- PID loops
- PCs vs. PLCs
- Replacing people
- MS 'monopoly'?
- Software quality
- Where do we go from here?
- Why pay?
Fortune
In success there's a tendency to keep on doing what you were doing.
-- Alan Kay
-- Alan Kay
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from the Automation List department...
Using string values in a Twido PLC
I am currently setting up a Magelis touchscreen and Twido PLC.
I have previously done this one an Idec PLC and screen but just used the PLC ladder logic and data registers with comparison functions so thias is a bit new to me.
I have written a script on the HMI to password protect a function, however I am currently using an internal variable in the panel and if the power is lost to the panel the user and password information is lost.
I know you can use memory words(%MW) to store ASCII values but from the Twidosuite help document you can only store two characters for every 16 bit word, which I am guessing would involve scripting to breakdown the user name and password.
Has anyone done this before?
Jon.
I have previously done this one an Idec PLC and screen but just used the PLC ladder logic and data registers with comparison functions so thias is a bit new to me.
I have written a script on the HMI to password protect a function, however I am currently using an internal variable in the panel and if the power is lost to the panel the user and password information is lost.
I know you can use memory words(%MW) to store ASCII values but from the Twidosuite help document you can only store two characters for every 16 bit word, which I am guessing would involve scripting to breakdown the user name and password.
Has anyone done this before?
Jon.
From Control Engineering magazine...
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