I am currently undertaking an incremental upgrade project for the existing SLC 500 and PanelView 550 systems, transitioning them from DH-485 communication to CompactLogix and PanelView Plus 7 models over Ethernet. My testing configuration includes an SLC 500 rack equipped with a 5/05 processor (OS501). In this setup, Channel 1 utilizes DH-485 communication linked to a 1761 NET-AIC, while Channel 0 is set up for Ethernet connectivity. The PanelView 550 (2711-K5A2) communicates over DH-485 through a 1747-AIC. Meanwhile, the CompactLogix controller (1769-L16ER-BB1B) and the PanelView Plus 7 (2711P-T7C21D8S) are both integrated into the Ethernet network. I have configured the CompactLogix to send messages that write values from the PanelView Plus 7 to a specified address in the 5/05 processor. However, I face a challenge: if I manually modify the value in the 5/05, it gets overridden by the existing message from the PLC. My goal is to determine if I should configure the system to send updates only when there is a change in data, effectively implementing a read-and-write toggle mechanism. My primary concern is to establish a reliable method for seamless read and write operations across both the PLC and HMI systems. I am open to exploring alternative solutions or strategies that may simplify this process. Any insights or recommendations would be greatly appreciated. Thank you!
There seems to be some confusion regarding the SLC5/05 controller. Notably, this model does not feature any DH ports; it is equipped solely with Ethernet and DF1. Moreover, for all SLC models, channel 0 is designated as DF1, while channel 1 on the SLC5/05 serves as the Ethernet port. With that clarification, I’m unsure about your specific inquiry. Generally, it's important to note that a Programmable Variable (PV) does not send messages; instead, it retrieves data directly from a PLC or PAC. For further insights into SLC5/05 capabilities and communication protocols, feel free to explore related subjects on PLC and PAC data management.
Firejo mentioned: "Something doesn’t seem to add up. The SLC5/05 model lacks any DH ports; it only features Ethernet and DF1, while channel 0 across all SLC devices is consistently DF1 (with channel 1 on the SLC5/05 designated for the Ethernet port). That being said, I'm not entirely sure what your question is. Typically, messaging is not conducted to a PV (PanelView) as the PV retrieves data from a PLC (Programmable Logic Controller) or PAC (Programmable Automation Controller). It seems there may be some confusion with channel numbers. Channel 0, which is the RS232 serial port, can certainly be configured for DH-485 protocol. To clarify the setup, it would be helpful to have a diagram illustrating the connections between the devices. It appears there’s a CompactLogix communicating with an SLC while a PanelView Plus (PV7) is connected to the CompactLogix. There are several methods to achieve this integration. One effective approach is to utilize separate tags for the read and write addresses across all three devices. This approach may require additional logic in the SLC to manage the data flow, and it might also necessitate the inclusion of handshake and notification bits, although my familiarity with the new PanelViews is quite limited."
I frequently find myself longing for the DH-485 connectivity on the SLC 5/05. While it's certainly possible to implement this feature, it isn't commonly utilized in modern applications. However, it can absolutely be achieved.
You are absolutely right! Additionally, let's consider the PV550 units linked to the SLC system. In this particular setup, there are six distinct PV550 devices—one for each bottling line—that select products (integers) from a shared PLC. My goal is to gradually upgrade the existing DH-485 PV550 units to the more advanced PVP7 models. This transition will enhance efficiency and performance across our bottling operations.
✅ Work Order Management
✅ Asset Tracking
✅ Preventive Maintenance
✅ Inspection Report
We have received your information. We will share Schedule Demo details on your Mail Id.
Join hundreds of satisfied customers who have transformed their maintenance processes.
Sign up today and start optimizing your workflow.