This addendum describes changes to the current standard. These modifications are the result of change proposals made pursuant to the ASHRAE continuous maintenance procedures and of deliberations within Standing Standard Project Committee 135. The changes are summarized below.

135.1-2007b-1. Omit certain tests when Averaging and Command properties are fixed or not present, p. 1. 135.1-2007b-2. Accommodate Group objects whose members list is not changeable, p. 3. 135.1-2007b-3. Revise Alarm Acknowledgement tests, p. 5. 135.1-2007b-4. Add new Alarm Acknowledgement "offnormal" tests, p. 8. 135.1-2007b-5. Label conditionally-writable properties in the EPICS, p. 10. 135.1-2007b-6. Add new object types, p. 11.