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Chapter Objectives
Controlling Remote Commands
Remote Command Control Message Set
In this chapter, you will read about the remote command control message
set. This chapter includes a description of each field of each protocol
layer above the HDLC data-link layer for remote command control
messages.
A remote command is a command you send to be stored at a remote
programmable controller station. You can store up to 256 remote
commands in each programmable controller interface. You envelope a
remote command within a store remote command message to send it to a
remote station for storage. Once you store a remote command at a remote
station, you can send one command to the remote station to have it initiate
up to 122 of the stored remote commands as if the remote station had
originated them. This gives the host computer connected to the
1779-KFM interface the ability to control communication between
programmable controllers.
For example, a computer at Node 1 may send a command to Node 2 to
store Remote Command 6. Remote Command 6 may be a command to
Write Block A (a specified block of data from PLC-3 memory) to a
specified area of PLC-2/30 memory at Node 3.
10
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Troubleshooting
