通讯实践汇总

罗克韦尔

CIP协议
通过标签读写变量真的很方便

python通过pycomm库实现CIP通讯
代码示例：

from pycomm3 import LogixDriver
import time
# PLC 的 IP 地址
plc_ip = '192.168.11.11'
while True:
    try:
        # 使用 with 语句自动处理连接和断开
        with LogixDriver(plc_ip) as plc:
            while True:
                try:
                    # 1. 读取单个标签
                    result = plc.read('Device_Data.QXZ.CM_40001')
                    print(f"读取结果: 标签={result.tag}, 值={result.value}")
                    # # 2. 写入单个标签
                    tmp = input('输入一个要写入的浮点值:')
                    try:
                        tmp_value = float(tmp)
                        write_result = plc.write('Device_Data.QXZ.CM_40001', tmp_value)
                    except ValueError:
                        print('输入的不是浮点数')
                    # 3. 读取多个标签 (批量读取效率更高)
                    tags = [f'Device_Data.QXZ.CM_4{i:04d}' for i in range(1, 14)]
                    results = plc.read(*tags)
                    for res in results:
                        print(f"{res.tag}: {res.value}")
                except Exception as err:
                    print(f'读或写错误{err}')
                    break
    except Exception as e:  
        print(f"连接失败: {e}")
        time.sleep(1)

打印结果

西门子