java程序读取PLC的浮点数，读取到的小数位错误，请问如何解决？

1.采用modbus4j实现了modbus通信，但读取PLC的浮点数时，读取到整数位正确，小数位错误，请问如何解决？

1. 读取PLC保持寄存器的方法如下：

   readHoldingRegistersTest(master,1,1,4);
   private static void readHoldingRegistersTest(ModbusMaster master,
           int slaveId, int start, int len) {
       try {
           ReadHoldingRegistersRequest request = new ReadHoldingRegistersRequest(
                   slaveId, start, len);
           ReadHoldingRegistersResponse response = (ReadHoldingRegistersResponse) master
                   .send(request);
           if (response.isException()) {
               System.out.println("Exception response: message="
                       + response.getExceptionMessage());
           } else {
               System.out.println(Arrays.toString(response.getShortData()));
               short[] list = response.getShortData();
               byte[] bb = shortToBytes(list);
               Float ff=byte2float(bb,0);
   
               System.out.println("读到"+ff);
   
           }
       } catch (ModbusTransportException e) {
           e.printStackTrace();
       }
   }
   

3.和PLC通讯时，PLC给出的数字为46.68，程序读取到的数字为46.5，![图片说明](https://img-ask.csdn.net/upload/201912/10/1575987797_782854.png)

4.和modbus slave仿真软件通讯时，数据读取正常。控制台输出如下：