# 初始化modbus_tk的Master对象 def init_master(ip, port): master = modbus_tcp.TcpMaster(ip, port) master.set_timeout(5.0) return master # 定义读写操作的函数 def read_write(device,operation, address, value): master = init_master(devices[device]["ip"], devices[device]["port"]) # 执行读写操作 if operation == 0: # 读取数据 data = master.execute(1, cst.READ_HOLDING_REGISTERS, address, 1) return (device, 'Read', address, data[0]) elif operation == 1: # 写入数据 master.execute(1, cst.WRITE_SINGLE_REGISTER,address, output_value=value) return (device, 'Write', address, value)有错误
时间: 2024-03-22 12:40:00 浏览: 15
这段代码没有明确导入模块 `modbus_tcp` 和 `cst`,需要先导入这两个模块才能正常运行。可以在文件头部添加以下导入语句:
```python
from modbus_tk import modbus_tcp
from modbus_tk import cst
```
另外,如果 `value` 参数是一个列表或者元组,需要将其转换为一个整数或一个浮点数,再进行写入操作。例如,可以使用以下代码将一个长度为 2 的列表 `value` 转换为一个 16 位的整数:
```python
output_value = (value[0] << 8) + value[1]
```
完整的代码如下:
```python
from modbus_tk import modbus_tcp
from modbus_tk import cst
# 初始化modbus_tk的Master对象
def init_master(ip, port):
master = modbus_tcp.TcpMaster(ip, port)
master.set_timeout(5.0)
return master
# 定义读写操作的函数
def read_write(device, operation, address, value):
master = init_master(devices[device]["ip"], devices[device]["port"])
# 执行读写操作
if operation == 0:
# 读取数据
data = master.execute(1, cst.READ_HOLDING_REGISTERS, address, 1)
return (device, 'Read', address, data[0])
elif operation == 1:
# 写入数据
if isinstance(value, (list, tuple)):
output_value = (value[0] << 8) + value[1]
else:
output_value = value
master.execute(1, cst.WRITE_SINGLE_REGISTER, address, output_value=output_value)
return (device, 'Write', address, value)
```