What would cause a phase parameter from not being successfully passed? The phase does use dynamic referencing to select the equipment module to receive the parameters. A key phase parameter was not successfully passed down to the equipment module on 4 sequential batches of the same recipe procedure. Downloading the unit appears to have corrected the current issue although there had not been any changes to the affected phase and other units from that class did not have a problem. Only a single parameter for one equipment module was affected. Other equipment modules successfully received all parameters and the affected equipment module received all other parameters correctly.