233 lines
8.1 KiB
Python
233 lines
8.1 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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VWED.melsec 模块 - Melsec PLC通信相关功能
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"""
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from typing import Optional, Union
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from utils.logger import get_logger
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import pymcprotocol
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class VWEDMelsecModule:
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"""VWED.melsec 模块 - Melsec PLC通信相关功能"""
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def __init__(self, script_id: str):
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self.script_id = script_id
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self.logger = get_logger(f"script.{script_id}.melsec")
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def read_boolean(self, ip: str, port: int, address: str) -> Optional[bool]:
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"""Melsec 读取 boolean
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Args:
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ip (str): 从机 IP
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port (int): 从机端口
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address (str): 读取的地址位
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Returns:
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Optional[bool]: 读取成功的返回值，失败返回 None
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"""
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try:
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# 创建Melsec连接
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plc = pymcprotocol.Type3E()
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plc.setaccessopt(commtype="binary")
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plc.connect(ip, port)
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# 读取布尔值
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result = plc.batchread_bitunits(address, 1)
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plc.close()
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if result and len(result) > 0:
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value = bool(result[0])
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self.logger.info(f"读取Melsec boolean成功: {ip}:{port} 地址: {address} 值: {value}")
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return value
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else:
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self.logger.warning(f"读取Melsec boolean无数据: {ip}:{port} 地址: {address}")
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return None
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except Exception as e:
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self.logger.error(f"读取Melsec boolean失败: {ip}:{port} 地址: {address} 错误: {e}")
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return None
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def read_number(self, ip: str, port: int, address: str) -> Optional[float]:
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"""Melsec 读取 number
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Args:
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ip (str): 从机 IP
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port (int): 从机端口
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address (str): 读取的地址位
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Returns:
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Optional[float]: 读取成功的返回值，失败返回 None
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"""
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try:
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# 创建Melsec连接
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plc = pymcprotocol.Type3E()
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plc.setaccessopt(commtype="binary")
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plc.connect(ip, port)
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# 读取数值（假设为16位整数）
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result = plc.batchread_wordunits(address, 1)
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plc.close()
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if result and len(result) > 0:
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value = float(result[0])
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self.logger.info(f"读取Melsec number成功: {ip}:{port} 地址: {address} 值: {value}")
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return value
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else:
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self.logger.warning(f"读取Melsec number无数据: {ip}:{port} 地址: {address}")
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return None
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except Exception as e:
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self.logger.error(f"读取Melsec number失败: {ip}:{port} 地址: {address} 错误: {e}")
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return None
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def read_string(self, ip: str, port: int, address: str, length: int) -> Optional[str]:
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"""Melsec 读取 string
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Args:
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ip (str): 从机 IP
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port (int): 从机端口
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address (str): 读取的地址位
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length (int): 读取的长度
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Returns:
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Optional[str]: 读取成功的返回值，失败返回 None
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"""
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try:
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# 创建Melsec连接
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plc = pymcprotocol.Type3E()
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plc.setaccessopt(commtype="binary")
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plc.connect(ip, port)
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# 读取字符串（每个字符占用2字节）
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word_count = (length + 1) // 2 # 计算需要读取的字数
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result = plc.batchread_wordunits(address, word_count)
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plc.close()
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if result and len(result) > 0:
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# 将字数据转换为字符串
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byte_data = []
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for word in result:
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byte_data.extend([word & 0xFF, (word >> 8) & 0xFF])
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# 转换为字符串并去除空字符
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value = bytes(byte_data[:length]).decode('ascii', errors='ignore').rstrip('\x00')
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self.logger.info(f"读取Melsec string成功: {ip}:{port} 地址: {address} 长度: {length} 值: {value}")
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return value
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else:
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self.logger.warning(f"读取Melsec string无数据: {ip}:{port} 地址: {address}")
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return None
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except Exception as e:
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self.logger.error(f"读取Melsec string失败: {ip}:{port} 地址: {address} 错误: {e}")
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return None
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def write_boolean(self, ip: str, port: int, address: str, value: bool) -> bool:
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"""Melsec 写入 boolean
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Args:
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ip (str): 从机 IP
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port (int): 从机端口
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address (str): 写入的地址位
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value (bool): 写入的值
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Returns:
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bool: 成功返回 True，失败返回 False
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"""
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try:
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# 创建Melsec连接
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plc = pymcprotocol.Type3E()
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plc.setaccessopt(commtype="binary")
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plc.connect(ip, port)
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# 写入布尔值
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plc.batchwrite_bitunits(address, [1 if value else 0])
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plc.close()
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self.logger.info(f"写入Melsec boolean成功: {ip}:{port} 地址: {address} 值: {value}")
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return True
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except Exception as e:
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self.logger.error(f"写入Melsec boolean失败: {ip}:{port} 地址: {address} 值: {value} 错误: {e}")
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return False
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def write_number(self, ip: str, port: int, address: str, value: float) -> bool:
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"""Melsec 写入 number
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Args:
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ip (str): 从机 IP
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port (int): 从机端口
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address (str): 写入的地址位
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value (float): 写入的值
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Returns:
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bool: 成功返回 True，失败返回 False
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"""
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try:
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# 创建Melsec连接
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plc = pymcprotocol.Type3E()
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plc.setaccessopt(commtype="binary")
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plc.connect(ip, port)
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# 写入数值（转换为整数）
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int_value = int(value)
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plc.batchwrite_wordunits(address, [int_value])
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plc.close()
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self.logger.info(f"写入Melsec number成功: {ip}:{port} 地址: {address} 值: {value}")
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return True
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except Exception as e:
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self.logger.error(f"写入Melsec number失败: {ip}:{port} 地址: {address} 值: {value} 错误: {e}")
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return False
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def write_string(self, ip: str, port: int, address: str, value: str) -> bool:
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"""Melsec 写入 string
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Args:
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ip (str): 从机 IP
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port (int): 从机端口
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address (str): 写入的地址位
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value (str): 写入的值
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Returns:
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bool: 成功返回 True，失败返回 False
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"""
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try:
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# 创建Melsec连接
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plc = pymcprotocol.Type3E()
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plc.setaccessopt(commtype="binary")
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plc.connect(ip, port)
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# 准备字符串数据
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byte_data = value.encode('ascii')[:254] # 限制长度并编码为ASCII
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# 补齐到偶数长度
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if len(byte_data) % 2 == 1:
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byte_data += b'\x00'
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# 转换为字数据
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word_data = []
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for i in range(0, len(byte_data), 2):
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word = byte_data[i] | (byte_data[i+1] << 8)
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word_data.append(word)
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# 写入字符串
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plc.batchwrite_wordunits(address, word_data)
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plc.close()
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self.logger.info(f"写入Melsec string成功: {ip}:{port} 地址: {address} 值: {value}")
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return True
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except Exception as e:
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self.logger.error(f"写入Melsec string失败: {ip}:{port} 地址: {address} 值: {value} 错误: {e}")
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return False |