snap7_siemens_plc_connect_read_datablock_quickstart.py

1import snap7
2
3# create a client object
4client = snap7.client.Client()
5
6# connect to the PLC
7# replace '192.168.0.1' with your PLC IP address
8# rack and slot depend on your PLC hardware (usually 0, 1 for S7-1200/1500 or 0, 2 for S7-300)
9client.connect('192.168.0.1', 0, 1)
10
11# check if connected
12if client.get_connected():
13    print("Connected to PLC")
14    
15    # read 4 bytes from Data Block 1, starting at offset 0
16    data = client.db_read(1, 0, 4)
17    print(f"Data read: {data}")
18    
19    # disconnect
20    client.disconnect()
21else:
22    print("Failed to connect")
23
24# close the client
25client.destroy()