Application

Overview
Hardware Outputs
6
Siemens Industry, Inc.
Application Note, App 6663
140-1109
2014-10-27
Digital
 Night mode override (optional)
 Wall switch (optional)
 Spare DI
NOTE:
Digital Room Units (Firmware Revision 26 and later) will update their controlled inputs
without putting them Out Of Service. However, a command from an external source
through the digital room unit will put the associated BACnet Input point Out Of
Service.
Room Unit Identification
 For Analog Room Units – The revision number is visually identified by its case.
 For Digital Room Units (Firmware Revision 25 or earlier) – The revision number
displays for 5 seconds when the room unit is first powered up. These room units
will display laptop when a laptop is connected and will no longer update room
temperature sensor values.
 For Digital Room Units (Firmware Revision 26 and later) – The revision number
displays for 5 seconds when the room unit is first powered up or when a laptop is
disconnected. These room units will continue to display and update the room
temperature sensor values when a laptop is connected.
Hardware Outputs
Analog
 Spare AO 1, AO 2, and AO 3 (0-10V)
Digital
 Autozero Module (optional) (DO 8)
 Damper actuator (DO 1/DO 2)
 Valve actuator
 Spare DO (up to 3) (optional)
Ordering Notes
550-498PA
BACnet PTEC Constant Volume Controller