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TP Comfort 1200 HMI in slave mode on MPI

9/23/2024 12:53 PM	Rate (0)
A.DelimaGabardo Regular Member Joined: 2/11/2016 Last visit: 10/23/2024 Posts: 6 Rating: (0)	Hello everyone, how are you? I believe you can help me. I have 2 slave HMIs MP 377 for the same master PLC in MPI. In WinCC Flexible, the option "only master on the bus" is unchecked. When I convert to TIA Portal V13, for example, this option is checked, and it doesn't give me the option to disable it, even if I delete this connection in WinCC Flexible and recreate the connection from the converted file in TIA Portal. Does anyone have any idea how to disable this in TIA Portal? TP1200 Comfort - 6AV2 124-0MC01-0AX0 description: 12.1'' TFT display, 1280 x 800 pixels, 16M colors; Touch screen; 1 x MPI/PROFIBUS DP, 1 x PROFINET/Industrial Ethernet interface with MRP and RT/IRT support (2 Ports); 2 x Multimedia card slot; 3 x USB Attachment connection.zip (176 Downloads)

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9/24/2024 8:37 AM	Rate (0)
ElonksuM_SN_BN Regular Member Joined: 5/6/2022 Last visit: 11/6/2024 Posts: 484 Rating: (97)	Hi A.DelimaGabardo, The flag for "Only Master on Bus" is normally enabled in the HMI-connection. Also this flag is grayed and not possible to deactivate the flag. This flag declared only, the device is an active partner in the MPI/DP bus. In the past (WinCC flexible), as you mention, it was possible to disable this flag and so the device was only a passive partner and needs a PLC in the bus for communication or also for the MPI transfer. When this flag was enabled, it is possible to do a MPI transfer from WinCC flexible to the HMI without a connected PLC on the bus. It is no problem, if you have more than one HMI with enabled flag for "Only Master on the Bus". All Simatic HMI panels are master in the bus and also the used PLC for the communication with the panels is a master. The HMI is only a master class 2 and subordinated to a PLC. I think your problems with the MPI bus have an other point of origin. Maybe the termination of the bus is not ok? Best regards!
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9/24/2024 1:22 PM	Rate (0)
A.DelimaGabardo Regular Member Joined: 2/11/2016 Last visit: 10/23/2024 Posts: 6 Rating: (0)	Hi ElonKsuM The physical part of the network is working correctly, because if I revert to the old HMI (MP 377), it works perfectly. In the new setup, the PLC is the master, an MP377 with the "Only Master on Bus" disabled, and the new TP Comfort 1200 HMI with the "Only Master on Bus" enabled. Since the PLC is the one controlling the screens, in this new configuration, either one HMI works correctly, and the other doesn't, or vice versa. Since the only difference I found was the "Only Master on Bus" setting between the two HMIs, I believe that's the issue. If one is also set as the master, it is trying to override the other, which is passive. This is one of the tactics machine manufacturers use to tie all support and upgrades to themselves. I know because I've been part of it, but anyway, it’s part of the game. Best regards.

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