使用 CPPO 读取具有已知对象类、程序集实例、属性 ID 的以太网/IP 设备

Question

从工业以太网/IP 康耐视条码扫描仪中获取基本信息时遇到了一些问题。

根据 Cognex 文档 “DataMan ID 读取器对象（类代码：0x79）” 输入程序集实例 = 11 然后显示此对象的表格，字节 14~15 = 结果数据长度with 是一个 16 位整数。

From cpppo.server.enip.get_attribute import proxy_simple, proxy 
vendor, product_name, zz = proxy_simple( '10.202.180.90' ).read( [('@1/1/1','INT'),('@1/1/7','SSTRING'),('@0x79/11/14','UINT')] )
print(product_name)
print(vendor)
print(zz)

>>>['DataMan DM262 Reader']
>>>[678]
>>>None

我得到产品名称、供应商编号，但无法让它返回任何结果数据长度。文档中的另一个表格说明了相同数据的属性 ID 0X17 和类型 UNIT。所以我尝试了 ('@0x79/11/0x17','UNIT') 但也返回了 'None'。

如果有任何想法，我将不胜感激。

Picture of AttributeID Table
Picture of Input Assembly
https://github.com/pjkundert/cpppo

Answer 1

我终于弄明白了。 CIP Object 为 0x79，Instance 为 1，Attribute 为 0x10。这给了我一个包含所有我需要的数据的整数数组。

from cpppo.server.enip.get_attribute import proxy_simple
vendor, product_name, zz = proxy_simple( '10.202.180.66' ).read( [('@1/1/1','INT'),('@1/1/7','SSTRING'),('@0x79/1/0x10','SINT')] )

print(vendor)
print(product_name)
print(zz)

[678] ['DataMan DM374'] [20, 0, 1, 0, 0, 0, 13, 0, 48, 54, 52, 48, 53, 50, 50, 55, 49, 48, 56, 50, 57, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 , 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Output Window

Answer 2

尝试在 python 中使用 telnetlib 库。

from telnetlib import Telnet
import time

tn = Telnet('192.168.1.112', 23, 2)
trigger = "||>TRIGGER ON".encode('ascii') + b'\r\n'
tn.write(trigger)
time.sleep(0.1)
resultstring = tn.read_very_eager().decode('utf-8')
tn.close()

我不得不添加一个短暂的延迟，让扫描仪有时间准备好结果。从那里您可以根据需要处理结果字符串。比如我用过：

if resultstring == '000':
    pass
else:
    resultstring = resultstring[:-2]
print(resultstring)

由于 '000' 是读取错误的字符串，而在字符串末尾添加 \r\n 是正确读取。

DataMan 控制命令 chm 文件显示您可以使用的所有命令。 https://support.cognex.com/en/documentation/dataman/dm-260