Snap7 Python数据读/写至PLC期间的作业挂起异常
在使用Python-Snap7向西门子s7 1200 PLC读取和写入数据的过程中,我遇到如下异常: 线程2中的异常: 回溯(最近一次呼叫最后一次): 文件“C:\Users\MDoganli\AppData\Local\Programs\Python\Python37-32\Lib\threading.py”,第917行,位于\u bootstrap\u内部 self.run() 文件“C:\Users\MDoganli\AppData\Local\Programs\Python\Python37-32\Lib\threading.py”,第865行,正在运行 自我目标(*自我参数,**自我参数) 文件“C:\companys\Personal\deneme\deneme\u iterasyonlar\plcman.py”,第59行,读取数据 扭矩=可编程逻辑控制器读取面积(面积['DB'],110,80,24) 文件“C:\Users\MDoganli\AppData\Local\Programs\Python37-32\lib\site packages\snap7\client.py”,第256行,位于读取区域 检查错误(结果,context=“client”) 文件“C:\Users\MDoganli\AppData\Local\Programs\Python37-32\lib\site packages\snap7\common.py”,第65行,检查错误 引发Snap7异常(错误) snap7.snap7异常。snap7异常:b'CLI:作业挂起' 我在单通道db_read/db_write期间没有遇到此问题,但在另一个读或写通道处于活动状态时会出现此问题 我尝试过area_read&area_write和db_read以及db_write选项,但收到类似的错误 主要代码:Snap7 Python数据读/写至PLC期间的作业挂起异常,python,io,plc,s7-1200,snap7,Python,Io,Plc,S7 1200,Snap7,在使用Python-Snap7向西门子s7 1200 PLC读取和写入数据的过程中,我遇到如下异常: 线程2中的异常: 回溯(最近一次呼叫最后一次): 文件“C:\Users\MDoganli\AppData\Local\Programs\Python\Python37-32\Lib\threading.py”,第917行,位于\u bootstrap\u内部 self.run() 文件“C:\Users\MDoganli\AppData\Local\Programs\Python\Python
plc=plcman.PLC_Controller('192.168.30.100',0,1)
plc.connect()
time.sleep(1)
plc.start_thread2()
time.sleep(1)
plc.start_thread()
PLC数据读写代码
class PLC_Controller:
plc=c.Client()
def __init__(self, address, rack, slot):
self.address = address
self.rack = rack
self.slot = slot
def connect(self):
count = 0
if plc.get_connected() == False:
print("Try " + str(count) + " - Connecting to PLC: " +
self.address + ", Rack: " + str(self.rack) + ", Slot: " + str(self.slot))
try:
plc.connect(self.address, self.rack, self.slot) #('IP-address', rack, slot)
except Exception as e:
print(e)
if plc.get_connected() == True:
return plc.get_connected() == True
def get_word(self,_bytearray, byte_index):
data = _bytearray[byte_index:byte_index + 2]
data=data[::-1]
dword = struct.unpack('H', struct.pack('2B', *data))[0]
return dword
def read_data(self):
torque=plc.read_area(areas['DB'],110,80,24)
data1=self.get_word(torque,0)
time.sleep(0.8)
self.read_data()
def start_thread(self):
thread = threading.Thread(target=self.read_data, args=())
thread.daemon = True
thread.start()
def set_word(self,_bytearray, byte_index, word):
word=int(word)
_bytes = struct.pack('H', word)
_bytes=_bytes[::-1]
for i, b in enumerate(_bytes):
time.sleep(1)
_bytearray[byte_index + i] = b
res=plc.write_area(areas['DB'],110,24,_bytearray)
def start_thread2(self):
thread = threading.Thread(target=self.stoprun, args=())
thread.daemon = True
thread.start()
def stoprun(self):
Lamp=4
torque=plc.read_area(areas['DB'],110,80,24)
val1=self.set_word(torque, 0, 8)
self.stoprun()
提前感谢。读写应具有不同的PLC连接实例。修改后的连接将是:
plc=plcman.PLC_Controller('192.168.30.100',0,1) # for reading use plc.read_area()
plc.connect()
plc2=plcman.PLC_Controller('192.168.30.100',0,1)
plc2.connect() #for writing use plc2.write_area()
最多允许3个实例。在读写过程中,将不会收到“作业挂起”