[Storing date and time in Data Table Efficiently]

Yoy can save it as UTC (double word, seconds from 01/01/1900) and then in Excel convert it to date/time format.

 

 

[poll values using Modbus TCP master]

Use address 8 and 9 to read Net weight high and low bytes. Tags should be INT16.

 

 

[Web page change by Ladder function or actions]

I don´t think WebServer are the best way to inform alarms. From my point of view, WebServer are not HMI extension.

If you need to remotely inform alarms, you could send SMS.

[New PLC startup]

Update firmware before first program download

[Password box in HMI]

Try User Access Control, a more powerful tool for your need

[Reading analog inputs]

I suspect you´re using a CT with AC volts output.  Analog input is only DC, 0 ... 10 Vdc range, then you need a converter from AC Volt to DC Volt.

[Reset TYPE bit]

In ladder, use RESET  COIL to reset the bit you use in HMI button

[Direct Read String from Data Table]

I suggest to split code in two separated rungs: first, to read row and second to SET MB 0  (You´re using contact instead of coil) and load HMI. Make sure you´re not using ML 1 in other place and variable in HMI is large enough to show all characters.

 

[V350 with multiple slaves frozes Modbus RTU Port]

I had same problem long time ago. Workaround was, to increase delay time between reading different devices when an offline device detected.

[V130 not display French accent]

Go to "HMI - Font Handler" menu, select the font you want to modify and select those characters you want to show (only not default fonts)

[KepServer to V700]

Regardless of the default socket and port configuration, I always configure the values at power up. It makes that rung explain itself and avoid misunderstandings with other programmers or even myself over time

[V290 upload error]

take a look to this topic:

 

 

[Unable to communicate by Modbus RTU]

Why 9600, 8, n, 2?  It isn´t usual. I suggest you to double check COMM INIT and Modbus Config blocks to match VFD parameters (baudrate, data and stop bits, address).

[PID CV-reset after status change heat cool]

After you switch cooling/heating bit, you need to re-configure PID.

["Rainfall Counter" data display]

Or simply use three different tags, one for each period, updating (SUM) them in each scan or in a base time. This way, you have instant values for all your periods. Of course, you will need to reset those tags at the right time (daily, weekly, monthly).

[I/ PT400]

Use LINEARIZATION FB.  Keep in mind module resolution is 0.1°C, that´s the reason X1 and X2 values are -2000 ... 6000 in the image

 

[Change HMI Start-Up screen]

You also cau use SB2 to call whatever display you want.

[Multiple PID Loops]

21 hours ago, keklon said:

I  need to have  some safeguards in place for the case of an open TC. When the Thermocouple is unplugged the  HSO is driven 100%. I see an red indicator appear on the IO-ATC8 . Is this reported to the control in a SB or do I need to write a net and do a range comparison with upper and lower limits?

Take a look to the module specs. It shows register values when analog input is out of range.

https://myzone-kza3sadj.netdna-ssl.com/wp-content/uploads/2015/12/IO-ATC8.pdf

[Multiple PID Loops]

I perform manual tuning when I have temperature process instead of auto tuning. I have better performance.  In general, to reduce overshoot, decrease P, but all systems have their own behavior.

[Communication Driver Error (206)]

I guess you´re using Remote Access software to show your Vision 130 and you believe it is a simulator.  However keep in mind that all Unitronics software requires a physical PLC in order to view online data.  There is not simulator.

[Help learning PLC]

It would be nice to have an option to save VLP file including registers values

[RS485 With Termination or not?]

I always use terminal resistors at both ends of an RS485 network, even in point-to-point short cables. Also, I use shielded cables ground at a single point. Rarely had problems with this.

[Help learning PLC]

For settings, if those are saved as registers, you may use "Export PLC Operands to Text File" under Connection menu. I use to save operands file together with VLP and OS files as a full backup of my applications.

[Measured input to IO LC1 card]

On 2/28/2019 at 5:03 AM, Wastle said:

There are sources of electromagnetic fields, but it doesn't bother the other systems.  I have already changed the module.

Out of interest(newbie here) I am assuming the calibration settings are stored in the CPU which is located in the HMI.

Calibration data keeps on IO-LCx module.

[Analogue Temperature sensor 4-20mA]

You are using direct contacts instead of coils for VALVE SET / VALVE RESET