164 lines
7.4 KiB
Python
164 lines
7.4 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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'''
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# @Time : 2025/9/28 13:36
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# @Author : reenrr
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# @File : plc_data_reader.py
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# @Description : 通用PLC数据读取线程:按配置动态处理read/read_write类型的区域
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# 支持结构化数据解析(real/int/bool等)
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'''
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import threading
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import time
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import logging
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class PLCDataReaderThread(threading.Thread):
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def __init__(self, plc_client, plc_name, area_config, update_interval=0.03, max_array_size=10000):
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"""
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初始化PLC数据读取线程(配置驱动,支持多区域)
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参数:
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plc_client: 已连接的Snap7Client实例(来自PLCManager)
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area_config: 单个区域的配置(来自config.json的plcs[].areas)
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示例:{"name":"DB100_Read", "type":"read", "db_number":100, "offset":0, "size":6000, "structure":[...]}
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update_interval: 读取间隔(秒),默认30ms
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max_array_size: 自定义数组的最大存储条数,超过后自动删除最早数据,默认1000条
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"""
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# 线程名包含区域名,便于日志区分(如"PLCDataReader_DB100_Read")
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thread_name = f"{plc_name}_{area_config['name']}"
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super().__init__(name=thread_name, daemon=True)
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# 核心依赖(PLC客户端+区域配置)
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self.plc_client = plc_client
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self.plc_name = plc_name
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self.area_config = area_config # 动态区域配置,不再硬编码DB100
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self.area_name = area_config["name"]
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self.db_number = area_config["db_number"]
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self.offset = area_config["offset"]
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self.size = area_config["size"]
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self.area_type = area_config["type"] # 区分read/read_write/write
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# 自定义内存数据配置
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self.custom_array_name = f"{self.plc_name}_{self.area_name}"
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self.max_array_size = max_array_size
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# 动态创建自定义名称的内存数组
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setattr(self, self.custom_array_name, [])
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# 线程与输出配置
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self.update_interval = update_interval
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# 数据缓存(新增结构化数据存储)
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self.running = False
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self._latest_byte_data = None # 格式:(timestamp, data_info, raw_bytes, parsed_data)
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self._data_lock = threading.Lock() # 线程安全锁
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# 日志
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self.logger = logging.getLogger(f"PLCDataReader.{self.area_name}")
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def start(self):
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"""启动线程(验证PLC连接+读写类型适配)"""
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# 仅处理需要读的区域(read/read_write),write类型不启动
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if self.area_type not in ["read", "read_write"]:
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self.logger.warning(f"跳过启动:区域类型为{self.area_type}(无需循环读取)")
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return
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# 验证自定义数组是否创建成功
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if not hasattr(self, self.custom_array_name):
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self.logger.error(f"❌ 自定义数组创建失败!数组名:{self.custom_array_name}")
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return
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self.running = True
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super().start()
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self.logger.info(f"✅ 线程启动成功(DB{self.db_number},{self.area_type})")
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self.logger.info(f"🔧 内存配置:自定义数组名={self.custom_array_name},最大存储条数={self.max_array_size}")
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self.logger.info(f"🔧 配置:间隔{self.update_interval * 1000}ms,读取{self.size}字节,存储到{self.custom_array_name}数组中")
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def stop(self):
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"""停止线程(优雅清理)"""
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self.running = False
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if self.is_alive():
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self.join(timeout=2.0)
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if self.is_alive():
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self.logger.warning("⚠️ 线程未正常退出,强制终止")
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# 停止时输出数组统计信息
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custom_array = getattr(self, self.custom_array_name, [])
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self.logger.info(f"🛑 线程已停止(DB{self.db_number})")
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self.logger.info(f"📊 内存数组统计:数组名={self.custom_array_name},总存储条数={len(custom_array)}")
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def get_latest_byte_data(self):
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"""
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线程安全获取最新数据(返回原始字节+解析后的结构化数据)
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返回示例:
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{
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"timestamp": "2025-09-28 10:00:00.123",
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"data_info": {"area_name":"DB100_Read", "db_number":100, "offset_range":"0-5999", "actual_length":6000},
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"raw_bytes": bytearray(b'\x00\x10...'),
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"parsed_data": {"temperature":25.5, "pressure":100, "status":True} # 解析后的字段
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}
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"""
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with self._data_lock:
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if self._latest_byte_data is None:
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self.logger.debug(f"⚠️ 自定义数组{self.custom_array_name}无最新数据")
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return None
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# 返回字节数据的副本,避免外部修改
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return self._latest_byte_data.copy()
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def get_custom_array(self, max_records=None):
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"""
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线程安全获取自定义数组数据
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参数:
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max_records: 可选,指定返回的最大记录数
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返回:
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字节数据列表
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"""
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with self._data_lock:
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custom_array = getattr(self, self.custom_array_name, [])
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return custom_array[-1:] if custom_array else [] # 返回所有记录的副本
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def clear_custom_array(self):
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"""清空自定义数组"""
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with self._data_lock:
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custom_array = getattr(self, self.custom_array_name, [])
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custom_array.clear()
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self.logger.info(f"🧹 已清空自定义数组:{self.custom_array_name}")
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def run(self):
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"""线程主循环:读PLC→解析数据→更新缓存→写文件"""
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self.logger.debug(f"📌 主循环启动(DB{self.db_number},数组名:{self.custom_array_name})")
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while self.running:
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cycle_start = time.time()
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try:
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# 步骤1:读取PLC区域数据(调用Snap7Client的缓存方法)
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cache_success = self.plc_client.cache_large_data_block(
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db_number=self.db_number,
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offset=self.offset,
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size=self.size
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)
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# 步骤2:处理读取结果(缓存+解析+写文件)
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if cache_success and self.plc_client.data_cache is not None:
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raw_data = self.plc_client.data_cache # 原始字节
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# 步骤3:线程安全更新内存缓存
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with self._data_lock:
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self._latest_byte_data = raw_data
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# 获取自定义数组并添加新的字节数据
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custom_array = getattr(self, self.custom_array_name)
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custom_array.clear() # 清空旧数据
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custom_array.append(raw_data)
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# 日志显示当前数组状态(仅1条)
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self.logger.debug(f"✅ 已更新最新PLC记录,数组{self.custom_array_name}当前记录数:1")
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else:
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self.logger.warning(f"⚠️ 数据读取失败(DB{self.db_number}),跳过本次更新")
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# 步骤6:精确控制读取间隔
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cycle_elapsed = time.time() - cycle_start
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sleep_time = max(0, self.update_interval - cycle_elapsed)
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if sleep_time > 0:
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time.sleep(sleep_time)
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except Exception as e:
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self.logger.error(f"🔴 循环读取出错: {str(e)}", exc_info=True)
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time.sleep(self.update_interval)
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