Hi,

i'm adding a trend view in LWE but this trend is reset if i refresh or redownload the project and no historical data is shown, also when i set time to long interval, it's not working properly, it shows only 1 point with current value!

ahmed_badawi_teky

if i have SD card, can i save trend in it, at least for 1 hour?!

Hi,

I think the Datalog feature in LOGO! 8 is what you can use. Plugin a MicroSD-Card into LOGO! (right formated with teh right size) and add the datalog FDB to your program. In the properties of the Datalog FB you can configure what value you want to record.

Hope this helps

yes, I already tried it, but won't these record files be a big load on the SD card?

Hi,

a function where you can record data and see it at LOGO! (Trace function) is not possible. LOGO! offers a Trend view for I/O on the LOGO! display or Trend view in a user defined web-page.

You also can record data and view later on with MS Excel for example. Here you can use:

1. Datalog FB (up to 32 data, 20.000 entries per datalog record and up to 50 datalog records per MSD-card). The data are recorded as CSV.

2. PC Access. (part of LOGO! Soft Comfort) records data as CSV directly on a PC connected to LOGO!

3. I/O-Status (records all I/O dig. and analog in a CSV on a connected PC)

4. Record data on a PC with communication to LOGO! (S7 or Modbus as communication protocoll, or MQTT in LOGO! 8.4)

Hope this helps