Added a 1734-IB8 on the end of the case erector Point I/O rack for two new photo eyes. 1734-AENT, older one with the single port, now 8 modules. Controller is a 1769-L33ER, Studio 5000 v30.

Added the IB8 to the tree under the AENT in slot 8, downloaded. Now the whole rack is faulted, every module has the yellow triangle, and the AENT's connection tab says something about chassis size, 16#0009 I think, I didn't write it down. The AENT's network LED is green, module status flashing red.

Tried: reseated all eight modules, power cycled the rack twice, checked the IB8 is seated on the base properly. Removed the IB8 from the tree again and downloaded, and the rack came back. Put it back, faulted again.

Does the AENT need a firmware update before it'll take an eighth module? Mechanically it's all fine, I checked.