Repository navigation
Expand file tree
/
Copy paths7data.py
More file actions
308 lines (271 loc) · 13.3 KB
/
Copy paths7data.py
File metadata and controls
308 lines (271 loc) · 13.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
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