需要安装

pip install python-snap7

import snap7  
from snap7.util import *  
import struct  
  
# PLC的IP地址, Rack和Slot  
plc = snap7.client.Client()  
plc.connect('127.0.0.1', 0, 1)  # IP, Rack, Slot  
  
# 读取DB1中的10个字节，起始于0位置  
db_number = 1  
start = 0  
size = 10  
data = plc.db_read(db_number, start, size)  
  
# 将数据按照每两个字节转换为int16  
int16_values = []  
for i in range(0, len(data), 2):  
    # 使用struct解包两个字节  
    value = struct.unpack('>h', data[i:i+2])[0]  
    int16_values.append(value)  
  
print("读取的数据（int16）:", int16_values)  
  
# 断开连接  
plc.disconnect()