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Looks like HMI is slowing down PLC processing speed

7/13/2021 1:44 PM	Rate (0)
matheushaas Regular Member Joined: 2/8/2021 Last visit: 12/5/2023 Posts: 30 Rating: (0)	Hey everyone! I'm developing a project in TIA Portal v16, with: CPU 1515T-2 PN KTP900 Basic IHM IM 155-6 PN HF i/o device and three V90 drives. The application was working perfectly until I download the last version of the HMI in project (with 1 new page with 2 new graphic view). It seems that the HMI is slowing down the PLC, because all the axis movements has a delay to start. Also the MeasuringInput values are not valid anymore. In my HMI I have about 30 tags with cyclic continuous and 100ms acquisition time and my PLC is set to 30% communication load, if that matters btw. Can someone explain to me why downloading to the HMI is interfering in the PLC processing time?

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7/13/2021 1:59 PM	Rate (0)
matheushaas Regular Member Joined: 2/8/2021 Last visit: 12/5/2023 Posts: 30 Rating: (0)	Raised communication load to 50% and is working fine right now!

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This contribution was helpful to 1 thankful Users Jen_Moderator

7/13/2021 4:03 PM	Rate (1)
0_Einstein Diamond Member Joined: 7/7/2010 Last visit: 4/21/2025 Posts: 15809 Rating: (2496)	Your customers / users / operators / technicians can see data updating @ 100ms even when off-screen? I joke, but I ask a real question. Be sure and only update PLC tag data when it is on screen. To speed things up more, put all the tags the HMI needs to access in a single DB. In the PLC, just copy data to those HMI tags. This organizes the data so the HMI can request all of the data in a single request rather than 50 individual requests. matheushaas Raised communication load to 50% and is working fine right now!
	science guy
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This contribution was helpful to 2 thankful Users qwazee matheushaas

7/13/2021 5:56 PM	Rate (0)
matheushaas Regular Member Joined: 2/8/2021 Last visit: 12/5/2023 Posts: 30 Rating: (0)	No they can't lol Interesting tips, thank you so much! Best regards, M Haas

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This contribution was helpful to 1 thankful Users 0_Einstein

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