It is my belief that the PLC considers the Panel View as a remote IO module, focusing on transmitting and receiving specific data from the PLC to the RIO. Based on the message, it appears that the RIO in the Panel View may have malfunctioned or there is a loss of communication. If these Panel Views have reached their end of life, it may be necessary to consider upgrading. Depending on your current PLC system, transitioning to Ethernet or upgrading to a Logix PLC with an enhanced Panel View may be a more optimal solution to keep your machine operational.
This PanelView Plus unit appears to be around 20 years old, making it unlikely for the firmware to have developed a new bug. The error message specifies BT1, referencing Rack 1 Slot 8, and indicates a size mismatch. The screenshot depicts a pair of alternating Block Transfer instructions directed to Rack 1, Group 4, Module 0. These instructions appear to be of 18 Words (BTR Read) and 19 Words (BTW Write) in size and seem to be completing successfully. However, further confirmation is needed beyond just the screenshot.
The Knowledgebase warns that inadvertently writing to discrete I/O words in the basic I/O table for the device can disrupt Block Transfers. If this has been checked and ruled out as the issue, then other changes in the system should be investigated. Has the PLC program or PanelView application been recently modified?
Block Transfers are differentiated by Rack, Slot, and size. While the error references Rack 1 Slot 8, the BT's pointing to Rack 1 Group 4 Module 0 suggest a discrepancy. Typically, BTs are 64 words, not 18 or 19.
In 2003, I excelled in building, migrating, and resolving issues with PanelView Plus units using RIO communication protocol.
Ken Roach mentioned that the PanelView Plus in question is likely over 20 years old, making it unlikely for the firmware to have recently developed a new bug. The specific error message indicates a size mismatch for BT1, referencing Rack 1 Slot 8.
The accompanying screenshot reveals what appears to be a pair of Block Transfer instructions targeted at Rack 1, Group 4, Module 0. These instructions seem to be 18 Words in size for the BTR Read and 19 Words for the BTW Write. While they appear to be executing successfully, a definitive conclusion cannot be drawn from a screenshot alone.
It is essential to be cautious about inadvertently altering the Block Transfer process by writing to the discrete I/O words in the basic I/O table for the device. If this has already been verified, the issue may lie elsewhere. Have there been any recent changes to the system, such as modifications to the PLC program or the PanelView application?
Block Transfers are differentiated by Rack, Slot, and size. While the error points to Rack 1 Slot 8, the Block Transfers in Rack 1 Group 4 Module 0 (equivalent to Rack 1, Slot 4) may not be the root cause. Normally, a Block Transfer consists of 64 words, not 18 or 19 as observed.
Ken Roach specializes in constructing, transitioning, and resolving issues with PanelView Plus devices utilizing RIO technology, particularly back in 2003.
AdamY expressed gratitude for the valuable information provided. The error message mentions "BT1 rack1 slot 8", which may be confusing. This refers to logical rack 1 and logical slot 8. If you are utilizing 1 slot addressing for logical rack 1, then slot 8 would correspond to that specific chassis. I hope this clarifies any confusion, although it has been some time since I dealt with this. For more precise details, you may find a thread on this topic more helpful than my cloudy recollections.
"I am finding PLC5 addressing to be extremely confusing. Can someone clarify the addressing system for me? I am new to PLCs 5 and would appreciate a visual explanation. Despite my extensive reading, the concept of rack, slot, and module group number is still unclear to me. How can I differentiate between inputs?" Visit www.plctalk.net for more insights.
Ken Roach mentioned that the PanelView Plus in question is likely over 20 years old, making it improbable that the firmware has recently encountered a new bug. The error message specifically references BT1 and identifies Rack 1 Slot 8, indicating a size mismatch issue. The screenshot reveals what seems to be a pair of alternating Block Transfer instructions targeted at Rack 1, Group 4, Module 0. These instructions seem to be 18 Words (BTR Read) and 19 Words (BTW Write) in size and are potentially completing successfully, although confirmation is needed beyond just the screenshot. It is important to note that inadvertently writing to the discrete I/O words in the basic I/O table for the device can disrupt a Block Transfer, as highlighted in the Knowledgebase. If this has been ruled out, then other changes in the system, such as modifications to the PLC program or PanelView application, should be investigated.
Block Transfers are differentiated by Rack, Slot, and size, with each BT typically being 64 words long, not 18 or 19. While the BT's in question point to Rack 1, Group 4, Module 0, the error relates to Rack 1 Slot 8, suggesting that different Block Transfers may be the issue. As an expert in building, migrating, and resolving issues with PanelView Plus using RIO in 2003, I encountered a runtime error on my PanelView and had to replace the logic module and CF card due to them having outdated 3.0 firmware. I upgraded the logic module to a newer firmware version, as anything prior to 3.2 is no longer supported.