如何控制网络摄像头的录制
我有一项很好的工作要为客户做。他有一个实验室，里面有一个网络摄像头，可以记录实验室工作中发生的事情。他有一个 PLC 来控制实验室的工作。
现在我们要控制录制的开始和停止，并将其保存到文件中。 PLC给出启动和停止信号。信号为电信号，+24V 为真信号，0V 为假信号。
我的想法是使用 PC 的数字输入卡，使用 VLC 作为网络摄像头，制作一个 Windows 应用程序（使用 Visual Studio C# 或 VB）来读取数字输入并使用 VLC API 来控制录制的开始/停止。
您有从事过此类工作的经验吗？或者其他可以指导我的信息？我非常感谢您的想法和帮助。
问候， 沃尔夫冈
I have a nice work to do for a customer. He has a lab where he has a webcam that records things that happens in the lab work. He has a PLC that controls the lab work.
Now we would like to control the start and stop of recording, and save it to a file. The plc gives the signals for start and stop. The signals are electrical, +24V for true and 0V for false.
My idea is to use a digital input card to the PC, use VLC for the webcam, make a Windows application (use Visual Studio C# or VB) that reads the digital inputs and uses the VLC API to steer start/stop of recording.
Do you have any experience of this kind of job? Or other info that can direct me? I'm very thankful for your ideas and help.
Regards,
Wolfgang
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大多数 PLC 允许您从以太网或专门设计的卡访问它们。
无论哪种方式，您都可以获得一些软件，可以让您读取和写入 PLC 上的地址，
因此不需要任何电气操作。
如果不知道 PLC 的品牌和型号，就无法透露更多信息。
它曾经是 Allen Bradley 的 RSView，但通常您会使用 PLC 来完成此操作。
您还可以获取适用于 PLC 的 SCADA 软件，尽管对于这种有限的东西来说这有点过分了，但是如果他们准备购买它（或者他们已经拥有它），您可以从 PLC 收集实验数据以进行处理视频......
只有 Allen Bradley 本人做过，那是在 99 年，所以我不会在细节方面提供太多帮助。
Most PLCs allow you to access them from ethernet, or a specifically designed card.
Either way you get some software that will let you read and write to addresses on the PLC
So no electrical doings required.
Can't say more without knowing the make and model of the PLC.
It used to be something called RSView for Allen Bradley, but usually you get something with the PLC for doing it.
You can also get SCADA software for the PLCs, though that would be over the top for something this limited, howevre if they were prepared to go buy it (or they already have it), you could collect experimental data off the PLC to got with the video....
Only did allen bradley myself, and that was back in 99, so I won't be too much help on the detailed side.