7/4/2021 3:51 PM | |
Joined: 10/5/2016 Last visit: 8/15/2024 Posts: 85 Rating: (0) |
Hi, Can i know what setting i need to change in the HMI |
7/4/2021 5:01 PM | |
Joined: 9/27/2006 Last visit: 9/21/2024 Posts: 12282 Rating: (2684) |
Hello arun; An HMI is a master on Profibus-DP, but not in the same sense as the PLC: a HMI is a Master Class 2, it holds no polling configuration for the slaves attached to it, it is part of the Profibus rotation (it receves the Profibus token when it is its turn to interrogate the Profibus nodes). The PLC on the other hand is a Master Class 1, you must configure every slave it wil interrogate with all data addresses and parameters and it polls them according to its polling list. See this article for a quick pesentation: https://visaya.solutions/en/qa/profibus-class-1-and-class-2-masters Now, if yu are using repeaters to estabish a link between a S7-400H and an HMI, did you follow the information presented in thiis FAQ, in section 4? https://support.industry.siemens.com/cs/ww/en/view/13595393 Examine especially the detail on the repeater power supply control through a switch, since the connection principle of the repeaters implies that on changepover (from main CPU to standby CPU) one of the repeaters must be turned off and the other turned on... Because of the presence of this switch (you remove power from one of the Profibus repeaters on changeover) you must also install an active terminating resistor on these repeaters. How did you setup such a switch, and do you control it through digital outputs in your program? At the end of the FAQ, certain settings are discussed (for a ProToll project, but they will apply to a WinCC (Flexible, TIA Portal) project as well. Hope this helps, |
Last edited by: dchartier at: 07/04/2021 17:03:26Last edited by: dchartier at: 07/04/2021 20:33:58 |
|
This contribution was helpful to3 thankful Users |
Follow us on