Plc4x寻址系统

Question

我正在发现Plc4x java实现，它似乎对我们的领域非常感兴趣。但是年轻的项目和文档让我们犹豫。我已经能够实现基本的hello world来读出我们的PLC，但我无法编写。我找不到如何处理地址以及maskwrite、andMask和orMask字段的含义。

请谁给我解释一下下面的例子，并详细说明地址应该如何使用？

    @Test
    void testWriteToPlc() {
        // Establish a connection to the plc using the url provided as first argument
        try( PlcConnection plcConnection = new PlcDriverManager().getConnection( "modbus:tcp://1.1.2.1" ) ){
            // Create a new read request:
            // - Give the single item requested the alias name "value"
            var builder = plcConnection.writeRequestBuilder();
            builder.addItem( "value-" + 1, "maskwrite:1[1]/2/3", 2 );
            var writeRequest = builder.build();

            LOGGER.info( "Synchronous request ..." );
            var syncResponse = writeRequest.execute().get();
        }catch(Exception e){
            e.printStackTrace();
        }
    }

Answer 1

我已经成功地使用PLC4x和modbus驱动程序进行了编写。下面是我正在使用的一些示例代码：

public static void writePlc4x(ProtocolConnection connection, String registerName, byte[] writeRegister, int offset)
    throws InterruptedException {

    // modbus write works ok writing one record per request/item
    int size = 1;
    PlcWriteRequest.Builder writeBuilder =  connection.writeRequestBuilder();

    if (writeRegister.length == 2) {
      writeBuilder.addItem(registerName, "register:" + offset + "[" + size + "]", writeRegister);
    }
...
    PlcWriteRequest request = writeBuilder.build();
    request.execute().whenComplete((writeResponse, error) -> {
      assertNotNull(writeResponse);
    });
    Thread.sleep((long) (sleepWait4Write * writeRegister.length * 1000));
}

在modbus写入的情况下，存在关于写入器Future的返回的问题，但写入已完成。在modbus用例中，我不需要任何掩码。