Rockwell Automation 9323-S5500D A.I. SERIES MICROLOGIX 1000 AND PLC-500 SOFTW - Manual (Page 338)

MicroLogix 1000 and PLC-500 A.I. Series Software Reference
15-2
A Network Example
The diagram on page 15-4 shows an example of an extended network that uses DH-
485, DH+, and Ethernet®. Numbers 1 to 6 in the diagram correspond to the following
descriptions:
1. Terminal on DH–485 Network. The first section of the table on page 15-9
indicates the methods you can use to connect a programming device to the DH–485
network.
2. DH–485 Network. The network can extend to a maximum length of 4000 ft
(1,219.2 m). The valid node address range is 0 - 31 decimal. The diagram shows
a 1747–AIC link coupler at each network drop. The interface device can be
connected to any of the link couplers (A, B, C, or D).
The diagram shows a processor (SLC 5/01, SLC 5/02, and SLC 5/03) connected to
three of the link couplers. The link couplers are powered by the processors. Note
that the fourth link coupler (at the left) does not have a processor connected to it.
For this reason, it is energized by a 24 VDC power supply, 1747–NP1 (or 1747–
NP2).
The DH–485 network extends downward on the right to a 1785–KA5 gateway
module. This gateway module is required only when you have a terminal on a
DH
+
network from which you want to communicate with devices on the DH–485
network. The gateway module has a node address (0 to 31 decimal) on the DH-485
network, as well as a DH-485 link id.
3. Terminal on DH
+
Network. This terminal is connected to an interface device,
which connects the programming device to the DH
+
network. With the A.I. Series
software installed, the programming device communicates with devices on the
DH
+
network. For DH–485 network communication, a 1785–KA5 Gateway
module is required.