Data Sheet for Product

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Siemens A6V10631834_en--_f
Smart Infrastructure 2021-10-20
Engineering and commissioning
Engineering
Engineering mainly consists of implementing the data model into a VAV application, espe-
cially sending the setpoint from the supervisory controller to the VAV compact controller and
receiving the actual values (flow and position) for control and monitoring. System limitations
of BACnet MS/TP apply, especially number of devices per segment and cable lengths de-
pending on the baud rate.
Commissioning
Two basic workflows are supported:
• Full or partial configuration (bus configuration and optionally VAV parameters configura-
tion) by a tool (AST20 or ACS941),
• Full or partial configuration over bus, usually using addressing by push-button, with subse-
quent configuration over bus.
Commissioning workflow 1: Full or partial configuration by tool
When using the AST20 handheld tool or the ACS931 / ACS941 PC tool, all bus and VAV pa-
rameters can be set.
• Connect AST20 or ACS931 / ACS941 (for PC tools, use AST22 interface converter) to the
VAV compact controller and navigate to the bus configuration menu,
• Set bus parameters as desired,
• Optionally make changes on VAV parameters.
Note
With AST20, all parameters can be set using the mass configuration function. The bus parameters are included in the
mass configuration function. It can be selected that the address is automatically incremented with each programmed
VAV compact controller. ACS931 / ACS941 supports saving and loading of parameter sets.
Commissioning workflow 2: Configuration over bus (full or partially)
The devices can be configured over bus (not using a separate configuration tool like in work-
flow 1) if the factory settings allow for a connection between a BACnet programming tool
(e.g. a BACnet browser) and peripheral devices.
Preconditions:
• No address must be present on the bus in more than one instance.
• Baud rate and format must match with the settings of the programming tool.
→ Option A, full configuration over bus: Only one device at a time is connected to the bus
and powered up. The device is then accessed by the BACnet programming / configuration
tool (using the default address) and the address and other parameters are set to the defini-
tive values.
→ Option B, partial configuration over bus: All devices are powered up and connected to the
bus before commissioning. Then all devices must have different addresses (using the push-
button addressing method described above.