S7-1500上的13 CM PtP模具数量…本地还是分布式？Quantity 13 CM PtP moudles on S7-1500... local or distributed?

我需要13个串行端口（CM PtP RS422/485 BA）连接到CPU 1513-1个。是否有好处或以下选项的缺点？

I need 13 serial ports (CM PtP RS422/485 BA) connected to a CPU 1513-1 PN.  Are there benefits or disadvantages with the following options?

1. 将所有13个CM PtP模块与CPU

   Put all 13 CM PtP modules in the same rack as the CPU

2. 将13个CM PtP模块分布在四个ET200 MP模块，ProfiNET连接回CPU

   Distribute the 13 CM PtP modules across four ET200 MP modules with ProfiNET connection back to the CPU

关注点：在选项2中，我会遇到ProfiNet连接限制问题吗因为所有与PtP模块的通信都将从单个ProfiNet发出端口（I/O节点的数量将低于处理器BUT的32个限制PtP模块需要FB调用来检索/发送数据，我担心对于该端口上的ProfiNet端口，运行到8个“可同时激活/停用的IO设备”的限制处理器。）8连接是否受限只是意味着我不能同时服务所有13个端口而是一次循环轮询几个？串行通信相当慢，所以我认为从吞吐量的角度来看，循环轮询是可行的，只要连接的数量将起作用。

Concerns: In option 2 will I run into issues with the limits of ProfiNet connections since all the communication to the PtP modules will go out a single ProfiNet port (The number of I/O nodes will be under the 32 limit for the processor BUT the PtP modules will require FB calls to retrieve/send data and I'm afraid of running into the limit of 8 "IO devices that can be activated/
deactivated simultaneously", for the ProfiNet port on that processor.)  Does the 8 connection limit just mean that I cannot try to service all 13 ports at the same time and instead do a cyclic polling of a few at a time?  The serial communication is fairly slow so I think that round robin polling is ok from a throughput perspective as long as the number of connections will work.

为什么？选项2：选项2保留CPU机架长度较长，需要添加PS模块来满足大量的模块。其他的考虑到S7-2500系统不可热插拔不同远程节点的串行模块应允许节点转动关闭并对PtP模块进行维护，而不会破坏整个系统。

Why option 2: Option 2 keeps the CPU rack from being long and requiring addition PS module to supply the power needs of the large number of modules. The other thought is that, since the S7-2500 system is not hot swappable, distributing the serial modules to different remote nodes should allow a node to be turned off and PtP modules serviced without killing the whole system.

详情：附屏幕截图。中的其他模块无论选择何种选项，系统都将是一个CP 1543-1以太网卡将位于CPU机架中，数量为四个IE/AS-i LINK PN IO（双AS-i主机到ProfiNET）模块通过其内置ProfiNET端口与CPU通信。CPU有88个空闲连接，因此我没有担心会达到这个极限。

Details: Screen shots attached. The other modules in the system, regardless of option chosen, will be one CP 1543-1 Ethernet card that will live in the CPU rack and quantity four IE/AS-i LINK PN IO (Dual AS-i master to ProfiNET) modules talking to the CPU via its build in ProfiNet port.  The CPU has 88 free connections so I'm not concerned about running into that limit.

为了简单起见，我决定选择选项1，并考虑到S7-1500系列的长MTFB。

I decided to go with option 1 for simplicity and considering the long MTFB of the S7-1500 series in general.