python snap7 读取并写入db块中dint值

以下是一个示例代码，该代码使用Python Snap7库来读取和写入DB块中的DINT值：

import snap7

# Connect to PLC
plc = snap7.client.Client()
plc.connect('192.168.1.1', 0, 1)

# Read DINT from DB block
data = plc.db_read(1, 0, 4) # read 4 bytes starting from offset 0
dint_value = snap7.util.get_dword(data, 0) # convert the 4 bytes to DINT value
print('DINT value:', dint_value)

# Write DINT to DB block
new_dint_value = 1234567890 # new DINT value to write
data = snap7.util.set_dword(new_dint_value) # convert DINT value to 4 bytes
plc.db_write(1, 0, data) # write 4 bytes starting from offset 0

# Read DINT from DB block again to verify
data = plc.db_read(1, 0, 4) # read 4 bytes starting from offset 0
dint_value = snap7.util.get_dword(data, 0) # convert the 4 bytes to DINT value
print('New DINT value:', dint_value)

# Disconnect from PLC
plc.disconnect()

以上代码示例假设DB块编号为1。如果DB块编号不同，则需要相应更改代码中的1。