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Kepware Knowledge Base: Solution

"Unable to read block" errors after ControlLogix v30 firmware upgrade

Last Update: 11/12/2018
After upgrading a ControlLogix device to firmware version 30, KEPServerEX reports errors when trying to read Boolean arrays from the device for several pre-defined structures.

The version 30 firmware upgrade changes Boolean arrays of tags in several pre-defined structures to a single Long tag. This means the address and type for those tags are now incorrect.
For example, a tag utilizing the SFC_STOP pre-defined structure has a 32-bit array of Boolean tags named Status before upgrading to firmware version 30. After upgrading the device to firmware version 30, there is only one Long tag named Status.

The bits in the new Long tag for each affected pre-defined structure can be accessed using the .bit notation. For example, to get the first bit of the Status tag for a SFC_STOP tag group, enter the address as SFC_STOP.Status.0 as type Boolean.

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