Services/ModbusTcpPlcService.cs

@@ -188,6 +188,24 @@ namespace AciTester.Services
             _tcpClient?.Close();
             _tcpClient?.Dispose();
         }
+
+
+        public async Task<int> ReadInt32Async(ushort startAddress)
+        {
+            await EnsureConnectedAsync();
+            var regs = await ReadHoldingRegistersAsync(startAddress, 2);
+            return (regs[0] << 16) | regs[1];
+        }
+
+        public async Task WriteInt32Async(ushort startAddress, int value)
+        {
+            await EnsureConnectedAsync();
+            var bytes = BitConverter.GetBytes(value);
+            if (BitConverter.IsLittleEndian) Array.Reverse(bytes);
+            ushort high = (ushort)((bytes[0] << 8) | bytes[1]);
+            ushort low = (ushort)((bytes[2] << 8) | bytes[3]);
+            await _master.WriteMultipleRegistersAsync(_config.SlaveId, startAddress, new ushort[] { high, low });
+        }
     }