运行环境 python2.7+window server2008+keep server
1、安装OpenOPC
a> 下载 OpenOPC-1.3.1.win32-py2.7 (1).exe 并安装
b> pip安装依赖包 Pywin32 + Pyro
c> 将OpenOPC安装目录下src文件夹下的OpenOPC.py复制到python安装目录下的Lib\site-packages目录下
d> 修改环境变量
OPC_MODE = open
2、连接opc服务器
# 导入包 import OpenOPC # 生成OpenOPC实例(Open mode) # In Open mode a connection is made to the OpenOPC Gateway Service running on the specified node. This mode is available to both Windows and non-Windows clients. opc = OpenOPC.open_client('localhost) # 显示可连接的opc服务器 print opc.servers() # If the OPC server is running on a different node, you can include the optional host parameter... opc.connect('Matrikon.OPC.Simulation', 'localhost')
3、读取opc服务器数据
taglist=['Channel_4.Device_6.Word_1','Channel_4.Device_6.Word_2', 'Channel_2.Device_3.Tag_1','Channel_2.Device_3.Tag_2', 'Channel_2.Device_3.Tag_3','Channel_4.Device_5.Tag_1', 'Channel_3.Device_4.Word_1','Channel_3.Device_4.Word_2',] # 读取一系列数据 opc_datas = opc.read(taglist) datas = [i[1] for i in opc_data] # 读取一个点 opc_data = opc.read(taglist) data = opc_data[1]
4、写入opc服务器
# 写入一个点 # 方式1 opc.write( ('Triangle Waves.Real8', 100.0) ) # 方式2 opc['Triangle Waves.Real8'] = 100.0 # 写入多个点 opc.write( [('Triangle Waves.Real4', 10.0), ('Random.String', 20.0)] )
5、其他
# 列出可获取的opc目录 >>> opc.list() ['Simulation Items', 'Configured Aliases'] >>> opc.list('Simulation Items') ['Bucket Brigade', 'Random', 'Read Error', 'Saw-toothed Waves', 'Square Waves', 'Triangle Waves', 'Write Error', 'Write Only'] # 模糊查询 >>> opc.list('Simulation Items.Random.*Real*') ['Random.ArrayOfReal8', 'Random.Real4', 'Random.Real8'] # opc服务器信息 >>> opc.info() [('Host', 'localhost'), ('Server', 'Matrikon.OPC.Simulation'), ('State', 'Running'), ('Version', '1.1 (Build 307)'), ('Browser', 'Hierarchical'), ('Start Time', '06/24/07 13:50:54'), ('Current Time', '06/24/07 18:30:11'), ('Vendor', 'Matrikon Consulting Inc (780) 448-1010 http://www.matrikon.com')] # 关闭opc连接 opc.close()