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Various supporting Communication Protocols of AB PLC SLC series.

In this post I am going to tell you the supporting communication protocols for SLC series of AB PLC.
Before I will tell you about various supporting communication protocols, I want you to get familiar with what is communication protocols exactly??

So, Communication protocols is nothing but set of rules for data transmission over a communication network when PLC is connected to other PLC or communication network.


There are various communication protocols available for PLC  like DH485, RS232, DH+(Data HighWay+), Ethernet, Universal Remote I/O's, Device Net, Control Net, etc.

DH485 :-

  • With this protocol we can connect up to 32 nodes to each other(means we can connect maximum 32 PLC stations to each other).
  • This protocol supports to SLC 5/01, SLC 5/02, SLC 5/03 AB PLC series.
  • This protocol supports 4000 feet of communication length with baud rate of 19200 bits/sec(19.2 Kb/s).

RS232 :-

  • It has the same baud rate as of DH485 that is of 19.2 Kb/s.
  • This protocols supports 33 feet of communication length, and used for point to point interfacing that is we cant only connects two nodes to each other.
  • This protocol supports to SLC 5/03, SLC 5/04, SLC 5/05 AB PLC series.

DH+ :-

  • This protocol is used for communication length of 10,000 feet with baud rate of 230.4 Kb/s.
  • DataHighWay + can be used for connecting maximum 64 nodes to each other.
  • AB PLC SLC 5/04 PLC series supports this communication Protocol.

Ethernet :-

  • This protocol has excellent advantage of unlimited communication length and unlimited node capacity that is we can connected infinite no. of nodes to each other without limitation of network length.
  • This protocol has a baud rate of 10 to 100 Mb/sec.
  • AB PLC SLC 5/05 supports this Communication Protocol.

Universal remote I/O's :-

  • This Protocol Support most of the AB PLC SLC series like SLC 5/02, SLC 5/03, SLC 5/04, SLC 5/05.
  • It has a baud rate of 230.4 Kb/s and can be used to connect maximum 32 nodes to each other.
  • It is used to connect two stations of up to 10,000 feet of communication length.

Device net :- 

  • This protocol has a baud rate of 500 Kb/s and with this protocol we can connect maximum 32 nodes to each other.
  • This protocol supports maximum 1700 feet of communication length.
  • This protocol also support most of the SLC series PLC like SLC 5/02, SLC 5/03, SLC 5/04, SLC 5/05.

Control net :- 

  • This communication protocol has a good supporting communication length of 30 Km and has a baud rate of 5 Mb/s.
  • With this communication protocol we can connect maximum 99 nodes to each other and it support to SLC 5/02, SLC 5/03, SLC 5/04, SLC 5/05 AB PLC series.

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