B&R,Beckhoff都是很成熟的系统,可靠性不用怀疑
这种就是我上面说的TTC,IFM之类的，只不过这些用于工程机械，倍福这些用于工业多 superdos 发表于 2018-5-18 21:30 static/image/common/back.gif
这种就是我上面说的TTC,IFM之类的，只不过这些用于工程机械，倍福这些用于工业多
用于工业控制24VDC电机的
back2049 发表于 2018-5-18 14:27
B&R,Beckhoff都是很成熟的系统,可靠性不用怀疑
我不质疑PLC的可靠性。我质疑客户能够正确连线PLC而不会出错。携带2.5安培的导线不正确会破坏PLC或运动控制器。有时，保险丝可以限制损坏，但客户仍然会看到不起作用的PLC或运动控制器。我们将输出部分进行光学隔离，因此只有光隔离的部分会烧毁。这保证了PLC的安全。
更糟糕的是，客户认为输出卡有问题，所以他将其替换为另一个，并且它也烧毁了。我看到过这种情况。客户焚烧了5个运动控制卡并指责我们。当与罗克韦尔项目经理共进晚餐时，他告诉我类似的故事，客户烧掉了更多的卡片，然后指责罗克韦尔。
当我们制作第二代运动控制卡时，我们将输出限制在+/- 10伏。我们为罗克韦尔制造的1746QS，1756-HYD02和1756-MO2AS卡也具有+/- 10伏输出。
您必须记住，我们已经为许多不同类型的PLC构建了运动控制器。我们必须与PLC制造商合作完成此项工作，并对设计进行测试以确保其符合他们的标准。没有PLC制造商的许可和认证，PLC卡就不能生产。
有一个原因为什么董事会是以某种方式设计的。
早在20世纪80年代和90年代初，博世伺服电磁阀使用外部放大器为阀门产生PWM电流信号。来自这些放大器的PWM电流在其他线路上产生大量噪声。外接放大器也不是一个好主意。博世现在拥有电子产品。这是最好的方法。现在PLC或运动控制器可以使用+/- 10伏来控制阀门。
唯一的限制是距离。 +/- 10伏信号不应超过30米。我们向RS422转换器和RS422转换器施加电压，以便控制器和阀门之间有很长的距离。
I do not question the reliabilty of the PLCs.I question the customer's ability to wire the PLC correctly without mistakes.Incorrectly connect wires carrying 2.5 amps will destroy the PLC or motion controller. Sometimes fuses can limit the damage but the customer will still see a PLC or motion controller that doesn't work.We optically isolate the output sections so only the optically isolated section will burn.This keeps the PLC safe.
What is worse is that the customer thinks there is something wrong with the output card so he replaces it another and it burns up too. I have seen this happen.The customer burns up 5 motion control cards and blames us. When having dinner with the Rockwell project manager, he told me similar stories where the customer burned up even more cards and then blamed Rockwell.
When we made our second generation motion control cards we limited the output to just +/- 10 volts.The 1746QS,1756-HYD02 and 1756-MO2AS cards that we make for Rockwell also have +/- 10 volt output.
You must remember that we have built motion controllers for many different types of PLCs. We must do this in cooperation with the PLC manufacturers and they test out designs to make sure they meet their standards. PLC cards cannot be made without the PLC manufacturers permission and certification.
There is a reason for why boards are designed a certain way.
Back in the 1980s and early 1990s the Bosch servo solenoid valves used external amplifiers to generate the PWM current signal for the valves.The PWM current from these amplifers generated lots of noise on other lines. External amplifiers are not a good idea either. Bosch now has on board electronics. This is the best way.Now the PLC or motion controller can use +/-10 volts to control the valve.
The only limitation is distance.The +/-10 volt signal should not be used for more than 30 meters.We make a voltage to RS422 converter and RS422 converter to voltage so there cane be long distances between the controller and the valves.
比例阀既是液压元件也是功率放大原件，功率放大就体现在放大器上，有的比例阀集成了放大器，可以直接用PLC控制，没有集成放大器的，要另配放大器。
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