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Siemens Desigo SX Open - SX Configurator, V2.1 CM110702en_06

Building Technologies Worksheets in SX Configurator 20 Mar 2012

Supported source object types

• Analog Input

• Analog Value

• Binary Input

• Binary Value

• Multistate Input

• Multistate Value

Supported destination object types

• Analog Output

• Analog Value

• Binary Output

• Binary Value

• Multistate Output

• Multistate Value

SX BACnet Client supports Device Object as source object, too. In this case

SystemStatus is used instead of PresentValue and furthermore only polling is

possible and an object name for identification is not allowed, because a device

object does not support the WhoHas service for itself. The read value is shifted by

2 and forwarded, the value 1 is written if source device object cannot be read. With

this approach it is possible, to use a multistate object to monitor device state.

A value will be written to destination object whenever a read response or a COV

notification is received. The write is independent of the received value; there is no

COV like behavior in SX BACnet client.

Every COV resubscription of a value is answered with a COV notification, therefore

the value is written to destination more often as expected by pure COV semantic.

To avoid too much load at one point in time COV lifetime is modified by a random

amount it is not exactly predictable when a resubscribe will happen, but the upper

bound COV lifetime will not exceeded.

It is not possible to use a source object for polling and COV simultaneously. Every

update of source object will be forwarded to target objects. Even if source object

does not change its value, a new poll cycle or a COV resubscription will be

forwarded to target objects.

Important

Note

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Siemens SX Series User's Guide Page 62