g20kid
Member
Hi All,
We are in the process of upgrading one of our PLC-5 machines to a CLX. The setup prior was a Controllogix processor doing some communication with a PLC-5 via DH+. It was working perfectly, but not now. We swapped out the old PLC-5 with a new Controllogix rack. So now we are trying to do some communication between two Controllogix racks via DH+. Our current setup is: Chassis A has a 1756-DHRIO card in slot 3 and the processor in slot 4. The 1756-DHRIO is set to use Channel A as DH+ with a node address 8#10. Chassis B has the processor in slot 0 and the 1756-DHRIO module in slot 1. This one uses Channel B as the DH+ port and has a node address of 8#56. The baud rates for the two cards match at 115k.
The message statement we are trying to use to communicate is a CIP Typed Write with the same source and destination as before. The path we are using is 1, 3, 2, 8#56, 1, 0. To my understanding the order of those is: local backplane (1), DHRIO slot (3), output port on that DHRIO (2), node address of recipient (8#56), recipient's backplane (1), recipient's processor slot (0).
Both DHRIO cards are showing solid green lights for their respective ports. And yet we have no information moving from the one PLC to the other. We also tried a CIP Typed Read with no success. Any tips or ideas on something we might be missing?
Thanks for reading.
We are in the process of upgrading one of our PLC-5 machines to a CLX. The setup prior was a Controllogix processor doing some communication with a PLC-5 via DH+. It was working perfectly, but not now. We swapped out the old PLC-5 with a new Controllogix rack. So now we are trying to do some communication between two Controllogix racks via DH+. Our current setup is: Chassis A has a 1756-DHRIO card in slot 3 and the processor in slot 4. The 1756-DHRIO is set to use Channel A as DH+ with a node address 8#10. Chassis B has the processor in slot 0 and the 1756-DHRIO module in slot 1. This one uses Channel B as the DH+ port and has a node address of 8#56. The baud rates for the two cards match at 115k.
The message statement we are trying to use to communicate is a CIP Typed Write with the same source and destination as before. The path we are using is 1, 3, 2, 8#56, 1, 0. To my understanding the order of those is: local backplane (1), DHRIO slot (3), output port on that DHRIO (2), node address of recipient (8#56), recipient's backplane (1), recipient's processor slot (0).
Both DHRIO cards are showing solid green lights for their respective ports. And yet we have no information moving from the one PLC to the other. We also tried a CIP Typed Read with no success. Any tips or ideas on something we might be missing?
Thanks for reading.
