Manual

Addressing from Data Highway Plus
Chapter 5
58
Two Data Highway Plus links are considered local to each other if they
are connected to the same Data Highway II link.
Figure 5.3 shows an example configuration using local Data Highway
Plus links.
Figure 5.3
A
Local Data Highway Plus Configuration
1779KP5
Data Highway II
1784T50
PLC5
PLC5Data Highway
Plus
1779KP5
1784T50
PLC5
Data Highway
Plus
PLC5
Link = 00
Node = 55
User = 01
Link = 00
Node = 55
User = 13
Link = 00
Node = 50
User = 01
Link = 00
Node = 50
User = 20
16495
When you address a local Data Highway Plus link from another Data
Highway Plus link, you are limited to addressing a total of 15 nodes (02
through 20 octal) on a Data Highway Plus link.
The LINK number is always zero for a local link.
The NODE number is the NODE address of the 1779-KP5 that connects
the other Data Highway Plus link to Data Highway II.
The USER number is the address of the node on Data Highway Plus.
For example, the following message instruction is an example of
communicating from a PLC-5 to a PLC-5 on a remote Data Highway Plus
using local addressing. This message instruction reads 1,000 words from
a PLC-5, Node 013 on a remote Data Highway Plus link. It reads these
Communicating to a Local Data
Highway Plus Link Using Local
Addressing