我有一个可以使用 pymodbus3 库连续读取线圈状态的工作代码。代码如下所示。这改编自一个基本示例,用于查找线圈状态(地址 0x01)更改为“1”并按要求执行任务而不会失败。
def run_server():
# ----------------------------------------------------------------------- #
# initialize your data store
# ----------------------------------------------------------------------- #
store = ModbusSlaveContext(
di=ModbusSequentialDataBlock(0, [17]*100),
co=ModbusSequentialDataBlock(0, [17]*100),
hr=ModbusSequentialDataBlock(0, [17]*100),
ir=ModbusSequentialDataBlock(0, [17]*100))
context = ModbusServerContext(slaves=store, single=True)
interval = 3
server = ModbusTcpServer(context, identity=identity, address=('0.0.0.0', 1502))
t = threading.Thread(target=server.serve_forever,name='server connection')
t.start()
loop = LoopingCall(f=updatevalues, a=server)
loop.start(interval, now=True)
reactor.run()
def updatevalues(a):
rfuncode = 1
wfuncode = 5
slave_id = 0x01
address = 0x02
contxt = a.context[slave_id]
values = contxt.get_values(rfuncode, address, count=1)
print(values[0])
#below part is checking the coil status whether its 0 or 1 and perform the necessary task
if(values[0]==1 or values[0]==17):
#Do my stuff if this case is satisfied
#reset the coil back to "0" after the task is performed
values = [0]
contxt.set_values(wfuncode, address, values)
if __name__ == "__main__":
run_server()
现在,我还需要并行监视保持寄存器(例如地址 400001)并读取值。由于保存寄存器已经在 run_server() 函数中初始化,我想我不必在那里做任何事情。但是我不确定在 updatevalues(a) 函数中要做什么,以便也可以监视保持寄存器。
谢谢您的帮助。