Tom Jenkins
Lifetime Supporting Member
We have an application using DH-485 communications. There are six MicroLogix 1200's, each associated with one of six PanelView 550's, a separate seventh panel with one SLC 5/03, and an eighth panel with one SLC 5/04 and one PanelView Plus. The 5/04 is the "master" and initiates all PLC to PLC data exchanges. We are using a separate AIC+ for each device.
When the PanelView 550's are not plugged in the network it is fine. As soon as any of the PanelView 550's are plugged in, the network dies. This is NOT a cabling problem, since the PanelViews communicate just fine with the individual MicroLogix 1200's through the two AIC+ modules when the master comm link is disabled. We have exhausted all of the "quick fixes" and tough choices from our local tech support, and we are getting desparate (not to mention pretty pi$$ed off - I told the customer at the beginning of the project I didn't want to use PanelViews).
We are considering converting the existing ML-1200's with a single com port to new ML-1200's with dual com ports and dedicate the second comm port to the PanelView 550. However, the second comm port will only communicate DF-1 19.2 kbaud. The Existing PanelView 550's will only communicate using DH-485.
A) Does anybody know of a DH-485 to DF1 converter? This would save replacing the PanelViews.
B) Does anyone have a more cost effective solution to this dilemna?
When the PanelView 550's are not plugged in the network it is fine. As soon as any of the PanelView 550's are plugged in, the network dies. This is NOT a cabling problem, since the PanelViews communicate just fine with the individual MicroLogix 1200's through the two AIC+ modules when the master comm link is disabled. We have exhausted all of the "quick fixes" and tough choices from our local tech support, and we are getting desparate (not to mention pretty pi$$ed off - I told the customer at the beginning of the project I didn't want to use PanelViews).
We are considering converting the existing ML-1200's with a single com port to new ML-1200's with dual com ports and dedicate the second comm port to the PanelView 550. However, the second comm port will only communicate DF-1 19.2 kbaud. The Existing PanelView 550's will only communicate using DH-485.
A) Does anybody know of a DH-485 to DF1 converter? This would save replacing the PanelViews.
B) Does anyone have a more cost effective solution to this dilemna?
Last edited: