diff --git a/Seyounth.Core/Extensions/DateTimeExtensions.cs b/Seyounth.Core/Extensions/DateTimeExtensions.cs
index 326190b..3b6736f 100644
--- a/Seyounth.Core/Extensions/DateTimeExtensions.cs
+++ b/Seyounth.Core/Extensions/DateTimeExtensions.cs
@@ -2,8 +2,8 @@ namespace Seyounth.Core.Extensions;
 
 public static class DateTimeExtensions
 {
-    public static int ToTimestamp(this DateTime dateTime)
+    public static long ToTimestamp(this DateTime dateTime)
     {
-        return (int)new DateTimeOffset(dateTime).ToUnixTimeSeconds();
+        return new DateTimeOffset(dateTime).ToUnixTimeMilliseconds();
     }
 }
\ No newline at end of file
diff --git a/Seyounth.Hyosung.Core/Plc/McPlc.cs b/Seyounth.Hyosung.Core/Plc/McPlc.cs
index b86f602..a7eb887 100644
--- a/Seyounth.Hyosung.Core/Plc/McPlc.cs
+++ b/Seyounth.Hyosung.Core/Plc/McPlc.cs
@@ -79,8 +79,8 @@ public class McPlc(string host, int port, Mitsubishi.McFrame type)
         // 将字符串使用 ASCII 编码转换为字节数组
         byte[] bytes = System.Text.Encoding.ASCII.GetBytes(value);
         // 确保字节数组长度为 10
-        byte[] fixedLengthBytes = new byte[fixedLength];
-        Array.Copy(bytes, fixedLengthBytes, Math.Min(bytes.Length, fixedLength));
+        byte[] fixedLengthBytes = new byte[fixedLength*2];
+        Array.Copy(bytes, fixedLengthBytes, Math.Min(bytes.Length, fixedLength*2));
         // 调用 WriteBytesAsync 方法写入字节数组
         await WriteBytesAsync(address, fixedLengthBytes);
     }