rajsiyer
Member
Hi friends,
Please take a look at the diagram attached..
Th PLC circled in red, i.e. Node2 can't get connected. If it's connnected to the 1747 PKTX's network, all other PLCs go offline. By itself it can be connected to the PC with InTouch and shows up on RSLinx. Problem is.. after properly configuring it to communicate with RSLinx/InTouch (by assigning it its Node ID)and linking it with the network, all other PLCs lose communication. It disturbs them all!.
To figure the problem,
I've Interchanged ALL the NET-AIC cards and found that they all work properly.
Next I've Interchanged the PLCs(With Racks, not merely the CPU cards) and found that the problem persists irrespective of what PLC you might connect at that node.
The Problem does not resolve or even worsen, whether you attach the termination resistors at the 1st or last PLC on the bus or for that matter on the problematic PLC at Node 2.
3. There's no problem or error indication in the program inside PLC at Node 2. It is in Run Mode and data is visible at the RS-view PC.
4. Disconnecting the Node 2's DH-485 from the RS-view network does not help. Infact, when Node2 is connected as a single PLC on the PKTX network, it shows up nicely on RSLinx, InTouch PC and also the RS-View PC at the same time.
At present, we get by, disconnecting the RS232 link between the Net AIC card of the Node 2 PLC. It is running and its data is utilised on the RS-view application, without problems. Only issue here is that it disturbs the upper network.
Please take a look at the diagram attached..
Th PLC circled in red, i.e. Node2 can't get connected. If it's connnected to the 1747 PKTX's network, all other PLCs go offline. By itself it can be connected to the PC with InTouch and shows up on RSLinx. Problem is.. after properly configuring it to communicate with RSLinx/InTouch (by assigning it its Node ID)and linking it with the network, all other PLCs lose communication. It disturbs them all!.
To figure the problem,
I've Interchanged ALL the NET-AIC cards and found that they all work properly.
Next I've Interchanged the PLCs(With Racks, not merely the CPU cards) and found that the problem persists irrespective of what PLC you might connect at that node.
The Problem does not resolve or even worsen, whether you attach the termination resistors at the 1st or last PLC on the bus or for that matter on the problematic PLC at Node 2.
3. There's no problem or error indication in the program inside PLC at Node 2. It is in Run Mode and data is visible at the RS-view PC.
4. Disconnecting the Node 2's DH-485 from the RS-view network does not help. Infact, when Node2 is connected as a single PLC on the PKTX network, it shows up nicely on RSLinx, InTouch PC and also the RS-View PC at the same time.
At present, we get by, disconnecting the RS232 link between the Net AIC card of the Node 2 PLC. It is running and its data is utilised on the RS-view application, without problems. Only issue here is that it disturbs the upper network.