DH485 Network node questions

Hello all,

I have an Allen Bradley DH485 network that currently has three devices.

Micrologix 1500 LSP series C w/1764-24awa base node 1d (main)

Micrologix 1500 LSP series C w/1764-24awa base node 1d (CIP)

PV1000 2711-T10C3 node 3 (max allowed 6)

1761-net-aic

Network has always worked fine but very slow update.

I’m trying to install a Redlion Data station plus on the network.

Model DSPGT node 6 Plugged into DB9 port on Net-AIC.

When I install the data station on the network it comms and records data. It also gives me a 615 fault on the pv1000. The user manual states that this means there is a duplicate node on the network. In the Panel Builder program for the 1000 its only pointing to one node main_panel node 1. The touch screen controls functions in both of the PLC's.

In both comm setups in the 1500's the message instructions both point to node 2.

In Crimson 3 the DSPGT Its programmed to comm. with node 1 and be node 6. It generates initial token. Baud is the same as 485 networks.

So is it possible the network is setup wrong with existing duplicate nodes and working? If so should the node address be changed to 1d and 2d and change message set up?

Any help is appreciated.

Thank you in advance.

Matthew

If so should the node address be changed to 1d and 2d and change message set up?

Click to expand...

If I am following your network setup correctly then yes. The ML1500's will have to have different node addresses if on the same network. In fact all nodes will have to have a unique address.

Hello Mickey thank you for the reply. Sorry mine has taken so long.

Thats what I thought. The PV1000 is limiting the nodes to 6.

RSLINX's 00
1500xxx 01
1500xxx 02
PV1000 03
x 04
x 05
DSPGT 06

Is RsLinks included in the 6 allowed node's limiting the actual decimal node adress to 5?

Ideally every unit should have the same 'highest node' setting. This saves time when the network is re-built when a node joins or leaves the network. If you add yet another node go back and reset all the other devices to one more.

Even though you may not have this particular piece of hardware the manual has a good introduction to the DH485 network and its operation. http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1756-um532_-en-p.pdf