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Can't see accessible nodes in TIA Portal

Created by: cosimo_mercuro145 at: 10/7/2024 8:07 AM (6 Replies)

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10/7/2024 8:07 AM	Rate (0)
cosimo_mercuro145 Joined: 9/19/2023 Last visit: 10/20/2025 Posts: 3 Rating: (1)	Hi. I'm triyng to do hardware detection of my Simatic s7-1500 in TIA Portal but I can't discover it: PLC and PC are in the same subnet. I'm using X1 interface on PLC and I can succesfully ping it. Anyway after searching, I can't see available devices or accessible nodes. Where I'm wrong ? Any idea? Thanks in advance.

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10/7/2024 8:47 AM	Rate (0)
ChristophD Grandmaster-Expert Joined: 5/12/2006 Last visit: 12/19/2025 Posts: 22816 Rating: (3073)	have you also try accessible nodes under the folder Online Accesses in tia portal?

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10/7/2024 9:49 AM	Rate (0)
cosimo_mercuro145 Joined: 9/19/2023 Last visit: 10/20/2025 Posts: 3 Rating: (1)	Hi. Thanks for your reply. It's the same:

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10/7/2024 10:59 AM	Rate (0)
sancruz Gold Expert Joined: 3/11/2019 Last visit: 1/7/2026 Posts: 1653 Rating: (322)	Hi, to find accessible nodes, DCP protocol / MAC address broadcast LAYER 2 is used. Please check if this is blocked somewhere (security software, managed switches, domain restrictionts). For example Symantec endpoint protection does block this with standard settings. regards sancruz
	Feedback appreciated, please rate
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This contribution was helpful to 1 thankful Users Vippi

10/7/2024 1:27 PM	Rate (0)
0_Einstein Grandmaster-Expert Joined: 7/7/2010 Last visit: 1/7/2026 Posts: 16354 Rating: (2521)	Is the PG/PC connected directly to the PLC? If not, what changes when you directly connect? cosimo_mercuro145 Hi. I'm triyng to do hardware detection of my Simatic s7-1500 in TIA Portal but I can't discover it: PLC and PC are in the same subnet. I'm using X1 interface on PLC and I can succesfully ping it. Anyway after searching, I can't see available devices or accessible nodes. Where I'm wrong ? Any idea? Thanks in advance.
	science guy
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10/10/2024 6:39 AM	Rate (1)
cosimo_mercuro145 Joined: 9/19/2023 Last visit: 10/20/2025 Posts: 3 Rating: (1)	Hi CristophD. Was only an iusse related to another device that had the same IP. Changing the subnet on the PLC's IP address all works fine. Thanks

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This contribution was helpful to 1 thankful Users sancruz

10/10/2024 10:50 AM	Rate (0)
sancruz Gold Expert Joined: 3/11/2019 Last visit: 1/7/2026 Posts: 1653 Rating: (322)	Thanks for the update. The solution may help others in the future, too. regards sancruz
	Feedback appreciated, please rate
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