CHAPTER2 Ethernet Unit

2-7 Using TELNET

Communicating by TELNET (remote operation) allows loading and editing point or

program data and operating the robot just the same if connected through an RS-232C

port.

Commands are easy to understand because they are identical to RS-232C communica-

tion commands.

2-7-1 Difference between TELNET and RS-232C communications

TELNET and RS-232C both perform the same processing. However, they use different

communication formats. This means that one format might not match your own particu-

lar system needs or objectives, so you should get a good understanding of their different

features before incorporating them into your system.

TELNET

• Easily connects to different types of systems. Can handle one versus multiple device

communications.

•Allows remote communications since it connects between separate systems.

•Basically not usable for real-time processing since real-time operation is not guaran-

teed.

RS-232C

•Basically handles one party to one party (or device) communications.

•Designed for communications between devices in close proximity.

•Operates largely to real-time specifications.

Ethernet communications protocol specifications do not guarantee real-time opera-

tion. So relying only on the Ethernet in situations such as robot emergency stop can be

extremely dangerous. Install safety interlock circuits using the emergency stop termi-

nal in the parallel I/O of the controller to ensure quick and effective emergency stops.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 49 50

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