SCL 边沿检测：上升沿与下降沿

PASS  上升沿只出现一个扫描周期 (5 step(s), 5 scan(s))
RESULT: ALL PASS (5 scan(s))

{
  "sources": [
    {
      "name": "blocks/FB_EdgeDetection.scl",
      "source": "FUNCTION_BLOCK \"FB_EdgeDetection\"\n{ S7_Optimized_Access := 'TRUE' }\nVERSION : 0.1\n   VAR_INPUT\n      Signal : Bool;   // 现场信号（按钮、传感器、运行反馈等）\n   END_VAR\n\n   VAR_OUTPUT\n      Rising : Bool;   // 上升沿：本周期为 1，且上周期为 0\n      Falling : Bool;  // 下降沿：本周期为 0，且上周期为 1\n   END_VAR\n\n   VAR\n      Prev : Bool;     // 上一扫描周期的 Signal\n   END_VAR\n\nBEGIN\n   REGION 边沿判断\n      // 上升沿 = 当前为 1 且上一周期为 0；下降沿相反。\n      #Rising := #Signal AND NOT #Prev;\n      #Falling := NOT #Signal AND #Prev;\n   END_REGION\n\n   REGION 保存历史状态\n      // 必须放在边沿判断之后：先比较，再更新历史值。\n      #Prev := #Signal;\n   END_REGION\nEND_FUNCTION_BLOCK\n"
    }
  ],
  "scenario": {
    "docs": [
      "blocks/FB_EdgeDetection.scl"
    ],
    "block": "FB_EdgeDetection",
    "tickMs": 10,
    "always": [
      "!(Rising && Falling)"
    ],
    "scenarios": [
      {
        "name": "上升沿只出现一个扫描周期",
        "steps": [
          {
            "set": {
              "Signal": false
            },
            "expect": {
              "Rising": false,
              "Falling": false
            }
          },
          {
            "set": {
              "Signal": true
            },
            "expect": {
              "Rising": true,
              "Falling": false
            }
          },
          {
            "set": {
              "Signal": true
            },
            "expect": {
              "Rising": false,
              "Falling": false
            }
          },
          {
            "set": {
              "Signal": false
            },
            "expect": {
              "Rising": false,
              "Falling": true
            }
          },
          {
            "set": {
              "Signal": false
            },
            "expect": {
              "Rising": false,
              "Falling": false
            }
          }
        ]
      }
    ]
  }
}