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s7data.py
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308 lines (271 loc) · 13.3 KB
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import snap7, csv, threading, warnings, time, ctypes
from utils.statepoint import *
class TS7DataItem(ctypes.Structure):
"""结构体 描述数据项的区域、类型、起始地址、数据长度等属性"""
_fields_ = [
('Area', ctypes.c_int),
('WordLen', ctypes.c_int),
('Result', ctypes.c_int),
('DBNumber', ctypes.c_int),
('Start', ctypes.c_int),
('Amount', ctypes.c_int),
('pdata', ctypes.c_void_p)
]
class S7Client(snap7.client.Client):
"""S7Client的封装，提供了一次读取多个DB块的能力"""
def connect(self, address, rack, slot, tcp_port = 102, retry: bool = True, retry_times: int = 10, max_stay: int = 300):
if bool(retry) == False:#不进行重试
return super().connect(address, rack, slot, tcp_port)
stay = 1#重试间隔
while retry_times == 0 or retry_times > 1:
try:
return super().connect(address, rack, slot, tcp_port)
except:
if retry_times > 1:
retry_times -= 1#--重试次数
time.sleep(stay)
stay *= 2#指数退避策略
if stay > max_stay:#限制最大重试间隔
stay = max_stay
return super().connect(address, rack, slot, tcp_port)
def multi_db_read_py(self, db_number: list, start: list, size: list):
"""一次性读取多个DB块的不同区域
"""
count = len(size)
buffers = [ctypes.create_string_buffer(i) for i in size]
params = []
for i in range(count):
params.append(TS7DataItem(snap7.type.Areas.DB, snap7.type.WordLen.Byte, 0, db_number[i], start[i], size[i], ctypes.cast(buffers[i], ctypes.c_void_p)))
array_type = TS7DataItem * count
param_array = array_type(*params)
result = self.read_multi_vars(param_array)
if result[0]:
raise RuntimeError("多组读取失败")
res_rtn = [bytearray(i) for i in buffers]
return res_rtn
class S7data:
"""负责从CSV文件加载数据点配置、管理PLC连接、组织数据读取、解析数据类型，并通过多线程实现数据的自动更新和变化监听。"""
def __init__(self, csvfile):
self.logger = None
self.S7Client = None
self.lock = threading.Lock()
self.thread_run = False #运行标志
self.threads = [] #存储所有数据更新线程
self.nodes = {} #存储csv中的数据点信息
self.node_data = {} #存储每个点的byte数据
self.groups = {} #按组组织数据点
self.target_from_name = {} #存储数据点名称与StatePoint之间的映射关系
with open(csvfile) as f: # 使用上下文管理器打开CSV文件，确保文件正确关闭
for i in csv.DictReader(f): # 使用csv.DictReader逐行读取CSV文件，每行数据自动转换为字典形式，key为CSV的列头
if i['name'] in self.nodes: # 检查当前行的节点名称是否已存在于已有的节点字典中
raise Exception(f"S7配置文件节点名称重复：{i['name']}") # 如果节点名称重复，抛出异常，提示重复的节点名称
else:
self.nodes[i['name']] = i # nodes（K->行name V->本行数据）
self.node_data[i['name']] = bytearray(int(i['size']))#（key->行name V—>按size创建的bytearray（用来存放PLC中取出的字节））
if i['group'] not in self.groups:
self.groups[i['group']] = [] #如果还没有该组，创建新组
self.groups[i['group']].append(i['name']) #将当前行name添加进对应的组
def set_logger(self, logger):
self.logger = logger
def set_S7Client(self, s7c: S7Client):
self.S7Client = s7c
def get_S7Client(self):
return self.S7Client
def get_value(self, name):
"""从node_data中取出数据，按照type字段的类型解析，返回有意义的数据"""
if len(name) > 3 and name[-3] == '[' and name[-1] == ']' and name[-2].isdigit() and 0 <= int(name[-2]) < 8:
index = int(name[-2])
name = name[:-3]
data = (self.node_data[name][0] >> index) & 1
elif self.nodes[name]['type'] == 'int':
data = snap7.util.get_int(self.node_data[name], 0)
elif self.nodes[name]['type'] == 'dint':
data = snap7.util.get_dint(self.node_data[name], 0)
elif self.nodes[name]['type'] == 'bool':
data = snap7.util.get_bool(self.node_data[name], 0, int(self.nodes[name]['offset']))
elif self.nodes[name]['type'] == 'boollist':
data = [(self.node_data[name][0] >> i) & 1 for i in range(8)]
elif self.nodes[name]['type'] == 'real':
data = snap7.util.get_real(self.node_data[name], 0)
elif self.nodes[name]['type'] == 'string':
data = self.node_data[name][2:2+int.from_bytes(self.node_data[name][1:2])].decode('gbk', errors='replace')
elif self.nodes[name]['type'] == 'wstring':
data = self.node_data[name][4:].decode(encoding='utf-16be', errors='replace')
else:
warnings.warn('暂不支持的类型：' + self.nodes[name]['type'])
if self.logger:
self.logger.error('暂不支持的类型：' + self.nodes[name]['type'])
return None
return data
def send(self, name):
"""数据变化时，调用StatePoint.inject(data)"""
if self.nodes[name]['type'] == 'int':
data = snap7.util.get_int(self.node_data[name], 0)
elif self.nodes[name]['type'] == 'dint':
data = snap7.util.get_dint(self.node_data[name], 0)
elif self.nodes[name]['type'] == 'bool':
data = snap7.util.get_bool(self.node_data[name], 0, int(self.nodes[name]['offset']))
elif self.nodes[name]['type'] == 'boollist':
data = [(self.node_data[name][0] >> i) & 1 for i in range(8)]
elif self.nodes[name]['type'] == 'real':
data = snap7.util.get_real(self.node_data[name], 0)
elif self.nodes[name]['type'] == 'string':
data = self.node_data[name][2:2+int.from_bytes(self.node_data[name][1:2])].decode('gbk', errors='replace')
elif self.nodes[name]['type'] == 'wstring':
data = self.node_data[name][4:].decode(encoding='utf-16be', errors='replace')
elif self.nodes[name]['type'] == 'int_list':
data = []
for i in range(0, int(self.nodes[name]['size']), 2):
data.append(snap7.util.get_int(self.node_data[name], i))
else:
warnings.warn('暂不支持的类型：' + self.nodes[name]['type'])
if self.logger:
self.logger.error('暂不支持的类型：' + self.nodes[name]['type'])
return None
if name in self.target_from_name:
for i in self.target_from_name[name]:
i.inject(data)
if self.nodes[name]['type'] == 'boollist' and name + '*' in self.target_from_name:
for i in range(8):
for j in self.target_from_name[name+'*'][i]:
j.inject(data[i])
def update(self, name):
"""数据发生变化则覆盖旧数据并注入对应的StatePoint"""
nodeinfo = self.nodes[name]
try:
while True:
if not self.thread_run:
return None
self.lock.acquire()
if not self.S7Client.get_connected():
warnings.warn('S7Client连接中断')
if self.logger:
self.logger.error('S7Client连接中断')
self.thread_run = False
self.lock.release()
return None
tmp = self.S7Client.db_read(int(nodeinfo['db']), int(nodeinfo['start']), int(nodeinfo['size']))
self.lock.release()
if self.node_data[name] != tmp:
self.node_data[name] = tmp#如果数据发生变化，覆盖旧数据
self.send(name)#注入各数据点对应的StatePoint
time.sleep(float(nodeinfo['frequency']) / 1000)
except RuntimeError as reason:
warnings.warn(reason)
if self.logger:
self.logger.error(reason)
self.thread_run = False
self.lock.release()
def start_auto_update(self):
"""启动自动更新所有允许读取的PLC节点的线程"""
if self.thread_run:
return None
self.threads = []
if self.S7Client == None:
warnings.warn('未初始化S7Client')
if self.logger:
self.logger.error('未初始化S7Client')
return None
if not self.S7Client.get_connected():
warnings.warn('S7Client未连接')
if self.logger:
self.logger.error('S7Client未连接')
return None
for key, value in self.nodes.items():
if value['read_allow'].upper() != 'FALSE':
self.threads.append(threading.Thread(target=self.update, args=(value['name'],)))
self.thread_run = True
for i in self.threads:
i.start()
def update_group(self, group_name):
nodesname = self.groups[group_name]#获取该组下所有数据点name
db_number = []
start = []
size = []
#遍历组内数据点
for name in nodesname:
nodeinfo = self.nodes[name]#获取代表行的字典
#获取db_number start size三个字段
db_number.append(int(nodeinfo['db']))
start.append(int(nodeinfo['start']))
size.append(int(nodeinfo['size']))
while True:
if not self.thread_run:
return None
tmp = False
read_valid = True
with self.lock:
if not self.S7Client.get_connected():
warnings.warn('S7Client连接中断')
if self.logger:
self.logger.error('S7Client连接中断')
self.thread_run = False
return None
try:
tmp = self.S7Client.multi_db_read_py(db_number, start, size)#一组的内容一把读完
except RuntimeError as reason:
warnings.warn(reason)
read_valid = False
if self.logger:
self.logger.error(reason)
self.thread_run = False
if read_valid and tmp:
for i in range(len(tmp)):
if self.node_data[nodesname[i]] != tmp[i]:
self.node_data[nodesname[i]] = tmp[i]
self.send(nodesname[i])
def auto_update_group(self):
"""使用多线程自动更新所有设备组的数据"""
if self.thread_run:
return None
self.threads = []
if self.S7Client == None:
warnings.warn('未初始化S7Client')
if self.logger:
self.logger.error('未初始化S7Client')
return None
if not self.S7Client.get_connected():
warnings.warn('S7Client未连接')
if self.logger:
self.logger.error('S7Client未连接')
return None
for group in self.groups.keys():
self.threads.append(threading.Thread(target=self.update_group, args=(group,)))
self.thread_run = True
for i in self.threads:
i.start()
def end_auto_update(self):
self.thread_run = False
for i in self.threads:
i.join()
def make_point(self, name, point_type = Statepoint):
"""
创建并返回一个 point_type 类型的点对象，并加入s7data的内部系统，以备后续存储数据、监听变化。
Args:
name (str): 点的名称。如果名称长度大于3且符合特定模式（如"name[index]"），则会被解析并可能创建多维存储结构。
point_type (Type[T], optional): 要创建的点的类型，默认为 Statepoint。
Returns:
T: 新创建的 point_type 类型的实例。
Raises:
ValueError: 如果 name 不在 self.nodes 中，则抛出此异常。
"""
index = -1
solvedname = name
if len(name) > 3 and name[-3] == '[' and name[-1] == ']' and name[-2].isdigit() and 0 <= int(name[-2]) < 8:
index = int(name[-2])
name = name[:-3]
solvedname = name + '*'
if name not in self.nodes:
raise ValueError("创建了未配置的点")
if solvedname not in self.target_from_name:
if index == -1:
self.target_from_name[solvedname] = []
else:
self.target_from_name[solvedname] = [[],[],[],[],[],[],[],[]]
res = point_type()
if index == -1:
self.target_from_name[solvedname].append(res)
else:
self.target_from_name[solvedname][index].append(res)
self.send(name)
return res