- 点位字典 CSV schema/加载/自动校验(缺失字段/量纲/重复点号,PRD 5.1) - 协议可插拔只读驱动:OPC UA(S7-1200 适配)/S7/Modbus/称重/能源/模拟 - 周期采集引擎:只读+背压保护+健康度指标(丢失率/P99/可用性) - Kafka 流式上行 + 本地 spool 断点续传(丢失率≤0.02% 保障) - 模板配置外置(gateway.yaml + 点位字典 CSV),换行业零改码 - 18 个单元测试全绿;端到端运行 SLA 达标
46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
# -*- coding: utf-8 -*-
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"""称重终端驱动 —— 化工/树脂行业称重仪参数化适配。
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多数称重仪表走串口(连续输出 / 命令应答)或 Modbus TCP;
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本驱动作为模板封装:优先按配置走 Modbus(复用 ModbusDriver),
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若配置指定 `mode: serial` 则走串口协议(需现场协议文档,由子类定制)。
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"""
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from __future__ import annotations
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from typing import Dict, List, Optional
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from point_dict.loader import Point
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from .base import Driver, SampleValue
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from .modbus_driver import ModbusDriver
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class WeighingDriver(Driver):
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"""称重终端只读采集驱动(参数化适配)。"""
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protocol = "weighing"
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def __init__(self, config: Optional[dict] = None):
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super().__init__(config)
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self.mode: str = self.config.get("mode", "modbus") # modbus | serial
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self._delegate: Optional[Driver] = None
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def connect(self) -> None:
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if self.mode == "modbus":
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# 称重仪表普遍支持 Modbus RTU/TCP,复用 ModbusDriver 参数化实现
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self._delegate = ModbusDriver(self.config)
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else:
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raise ConnectionError(
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"称重驱动 serial 模式需要现场协议文档支持,请实现子类或改用 modbus 模式"
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)
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self._delegate.connect()
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def read_points(self, points: List[Point]) -> Dict[str, SampleValue]:
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if self._delegate is None:
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raise ConnectionError("称重驱动未连接,请先 connect()")
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return self._delegate.read_points(points)
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def close(self) -> None:
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if self._delegate is not None:
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self._delegate.close()
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self._delegate = None
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