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How many PLCs can be connected?
#2
Well,

netPI and NIOT-E-TPI51 device both support netX51 industrial network controller featuring the 2x RJ45 LAN port interface

In general the netX51 chip can be set to

  1. PROFINET device mode to exchange data over PROFINET protocol with s single PROFINET master (PLC) across an PROFINET IP address
  2. TCP/IP mode to work as normal LAN network interface with an IP address
With netPI only mode 1 or mode 2 can be operated. You can load container https://hub.docker.com/r/hilschernetpi/netpi-nodered for Node-RED PROFINET support or https://registry.hub.docker.com/r/hilsch...ernet-lan/ for TCP/IP mode. Both a the same time is not possible since both container cannot share single netX51 chip.

With NIOT-E-TPI51 this is different. Node-RED PROFINET and TCP/IP support are installed natively on the system and not containers. This means mode 1 and mode 2 can be used a the same time. Node-RED PROFINET gets its PROFINET IP address assigned automatically by PLC over PROFINET and the second TCP/IP address you configure youtself in the web UI under network settings for interface "cifx0".

Now back to your question. Which of these modes do you want to use? I analysed your picture well, but I was not able to understand which mode you want to use finally. I see your blue network line and remark LAN / TCP/IP, so I suppose you want to use mode 2 only, right?

1. This question depends on mode 1 or 2. With mode 1 PROFINET it is always a 1:1. With mode 2 TCP/IP it is 1 : many, since you can use multiple s7comm nodes in Node-RED at the same time each using a different IP address to address multiple PLC over TCP/IP

2. In general a NL 50-MPI Ethernet to MPI/PROFIBUS adapter can address multiple PLCs at the same time while adapter has only a single IP address. To address subordinate multiple MPI/PROFIBUS PLCs have MPI/PROFIBUS address 2, 3 ,4 ... you have to follow the "rack" and "slot" scheme that is additional parameter of s7comm node or better said NL 50-MPI addressing scheme. The NL 50-MPI addressing scheme is explained in Hilscher's knowledge base here https://kb.hilscher.com/x/qKmKAQ

Thx
Armin
You never fail until you stop trying.“, Albert Einstein (1879 - 1955)

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Messages In This Thread
How many PLCs can be connected? - by Lingyue - December-14th-2020, 04:03 AM
RE: How many PLCs can be connected? - by Armin@netPI - December-14th-2020, 06:51 AM
RE: How many PLCs can be connected? - by Lingyue - December-14th-2020, 10:36 AM
RE: How many PLCs can be connected? - by Armin@netPI - December-14th-2020, 11:56 AM
RE: How many PLCs can be connected? - by Lingyue - December-15th-2020, 06:56 AM

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