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Python 通过S7协议读取PLC数据 原创
虹喵小仙女
发布于 2023-5-28 09:20
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python下载snap7模块
pip3 install python-snap7
测试程序
import snap7
import s7_utils
def connectPLC():
s7_utils.S7_200_Connect('192.168.1.2', 3, 0, 1, "1#PLC")
s7_utils.S7_200_Connect('192.168.1.3', 3, 0, 1, "2#PLC")
s7_utils.S7_200_Connect('192.168.1.4', 3, 0, 1, "3#PLC")
s7_utils.S7_200_Connect('192.168.1.5', 3, 0, 1, "4#PLC")
s7_utils.S7_200_Connect('192.168.1.6', 3, 0, 1, "5#PLC")
def getAllPLCData():
for bzplc in s7_utils.PLCArray:
plcobj = bzplc["plcObj"]
## 读取DB块
V = s7_utils.dbRead(plcobj, bool, 1, 200, 0, 4, 1)
PV = s7_utils.dbRead(plcobj, float, 1, 300, 0, 4, 0)、
## 读取M区
bj1 = s7_utils.mReadBool(plcobj,1,4)
bj2 = s7_utils.mReadBool(plcobj,1,3)
bj3 = s7_utils.mReadBool(plcobj,1,2)
bj4 = s7_utils.mReadBool(plcobj,1,1)
print(bzplc["name"]+"\n","电压:",V,"频率",PV,"报警1",bj1,"报警2",bj2,"报警3",bj3,"报警4",bj4)
connectPLC()
getAllPLCData()
s7_utils.S7_200_DisconnectAll()
S7协议工具类
s7_utils.py
import snap7
from snap7.util import *
PLCArray = []
## 连接PLC 加入数组
def S7_200_Connect(ip, type, rack, slot, name):
plcObj = snap7.client.Client()
plcObj.disconnect()
plcObj.set_connection_type(type)
try:
plcObj.connect(ip, rack, slot)
except:
print(f"连接状态: {ip} 连接失败")
return 0
print(f"连接状态:{plcObj.get_connected()} {ip} 连接成功")
saveData = {
"plcObj": plcObj,
"name": name,
"ip": ip
}
PLCArray.append(saveData)
return 1
def S7_200_getplcObj(ip):
for plc in PLCArray:
if plc["ip"] == ip:
return plc["plcObj"]
return 1
## 关闭所有PLC连接
def S7_200_DisconnectAll():
for plc in PLCArray:
# print(plc)
if plc["plcObj"] != None:
plc["plcObj"].disconnect()
return 1
## 读取DB块
def dbRead(plcObj, type, dbnum, startAddress, address, dblength, boolX):
"""
DB块的读操作;如果是200smart系列的将dbnum设置为0
:param dbnum: DB1
:param dblength:
:return:
"""
data = plcObj.read_area(snap7.types.Areas.DB, dbnum, startAddress, dblength)
# print(data)
if type == int:
return get_int(data, address)
elif type == bool:
return get_bool(data, address, boolX)
elif type == str:
return get_dword(data, address)
elif type == float:
return get_real(data, address)
elif type == bytes:
return get_byte(data, address)
else:
return None
## 写DB块
def dbWrite(plcObj, type, data, dbnum, startAddress, dblength, address):
"""
DB块的写操作;如果是200smart系列的将dbnum设置为0
:param dbnum: DB块的序号
:param dblength:
:return: 字节长度,根据需要设定
"""
data = plcObj.read_area(snap7.types.Areas.DB, dbnum, startAddress, dblength)
if type == int:
set_int(data, address, data)
elif type == bool:
set_bool(data, address, 0, data)
elif type == str:
set_dword(data, address, data)
elif type == float:
set_real(data, address, data)
elif type == bytes:
set_byte(data, address, data)
else:
return None
plcObj.write_area(snap7.types.Areas.DB, dbnum, startAddress, data)
def mReadBool(plcObj, num, bit):
"""
M区的读操作--------bool
:param num:
:param bit:
:return:
"""
data = plcObj.read_area(snap7.types.Areas.MK, 0, num, 1)
# print(data)
return get_bool(data, 0, bit)
def mRead(plcObj, type, num):
"""
M区的读操作--------int/word/dint/dword
:param num:
:return:
"""
data = plcObj.read_area(snap7.types.Areas.MK, 0, num, 2)
if type == int:
get_int(data, 0)
elif type == bool:
get_byte(data, 0)
elif type == "dint":
get_dint(data, 0)
else:
return None
def mWriteBool(plcObj, byte, bit, value):
"""
M块的写操作---------bool
:param byte:
:param bit:
:param value:
:return:
"""
data = plcObj.read_area(snap7.types.Areas.MK, 0, byte, 1)
set_bool(data, 0, bit, value)
plcObj.write_area(snap7.types.Areas.MK, 0, byte, data)
def mWrite2(plcObj, byte, value):
"""
M块的写操作---------int/word/dint/dword
:param byte:
:param value:
:return:
"""
data = plcObj.read_area(snap7.types.Areas.MK, 0, byte, 4)
# set_int(data, 0, value)
set_dint(data, 0, value)
plcObj.write_area(snap7.types.Areas.MK, 0, byte, data)
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