Python读取PLC值-0基础入门教程

Python读取PLC值-0基础入门教程

1，下载Python并安装

https://www.python.org/ftp/python/3.14.2/python-3.14.2-amd64.exe

2, 下载PyCharm并安装

https://download-cdn.clf.jetbrains.com.cn/python/pycharm-2025.3.1.exe?Expires=1766971477&Signature=d8OLreNn8me1xud3L-ksNcjvN2bC0Ov~KGmeErm9IMeYeBiWmavupRHJxHjqUGQU-E4GRlWihOtMg-omgV4Ya5MzEBwo0p-YSwyPru2i-T1Z5kncvW-44Us~BtzOKb2zv1--51lJ2k-IJJN9V-xzitrxYPknhgmu9GG0ZCFIocVDASoAjmgEeyLjyUVzgAdXIxXxPURGpDzqDAktaRt2dWWean~x8c9tc8Yh~PMlTRMu73HBb8UyblIW80rJgmTYJV-wLNHX6zgSJHuqzqaKATKtb7SRXLsjNT0BlwznX2swAfRiv7xhRY-s4Fw5-ReZS4xY1ggCYNrU5772Kj7XRw__&Key-Pair-Id=

3，打开PyCharm左下角点击终端

输入  pip install python-snap7  并回车

4,新建一个test_PLC的Python文件并输入以下代码

import snap7

from snap7.util import get_int

# 创建客户端

plc = snap7.client.Client()

try:

    # 连接到PLC (IP, rack, slot)

    plc.connect("192.168.2.2", 0, 1)

    print("PLC Connected:", plc.get_connected())

    # 读取DB120偏移0的INT值

    data = plc.read_area(snap7.type.Areas.DB, 120, 0, 2)

    value = get_int(data, 0)

    print("DB120.DBW0 (INT) =", value)

except snap7.exceptions.Snap7Exception as e:

    print("PLC Error:", e)

finally:

    # 断开连接

    if plc.get_connected():

        plc.disconnect()

运行代码即可显示读取DB120偏移0的INT值；

若手动输入，请注意大小写！