Functions
4.2 State model
PN/BACnet LINK
Operating Instructions, 10/2017, A5E39895543-AA
31
S7 controller goes into STOP
operating state.
The PN/BACnet LINK state changes to STOP
(NON_OPERATIONAL).
• All BACnet Server objects are set to "Out_Of_Service" =
TRUE.
• "System_Status" property in the device object is set to
NON_OPERATIONAL.
• BACnet server: The device object is visible in the BACnet
network. All requests directed to other server objects are re-
jected with an error.
• BACnet client: All requests to BACnet devices are still being
sent.
SIMATIC S7 goes into RUN op-
erating state
The PN/BACnet LINK state changes according to a status ac-
cording to the server control byte. Possible states are:
OPERATIONAL/NON-OPERATIONAL or OPERATIONAL-READ-
ONLY.
• "Out_Of_Service" of all BACnet server objects updated ac-
cording to the process image
• If the client control bit is set to "ON", the BACnet client starts
the BACnet communication.
• "System_Status" property in the device object is set to accord-
ing to the server control byte in the process image of the S7
controller.
Termination of the S7 connection
(after the PN/BACnet LINK has
been configured once by the S7
controller)
The PN/BACnet LINK state changes to STOP
(NON_OPERATIONAL).
• All BACnet Server objects are set to "Out_Of_Service" =
TRUE.
• "System_Status" property in the device object is set to
NON_OPERATIONAL.
• BACnet server: The device object is visible in the BACnet
network. All requests directed to other server objects are re-
jected with an error.
• BACnet client: No requests are sent to BACnet devices any
longer. Existing subscriptions are canceled.
Reconfiguration by S7 controller The PN/BACnet LINK state changes to CONFIGURATION.
• Existing custom BACnet client subscriptions and BACnet
server objects are deleted.
• The PN/BACnet LINK receives the necessary configuration
data from the S7 controller.
• When configuration is complete, the PN/BACnet LINK begins
with the BACnet communication.
The configured read and write functions are still executed in the STOP state. This means
that PN/BACnet LINK still communicates on the BACnet side. Only cyclic communication
with the S7 controller is interrupted. With write accesses, this means that the PN/BACnet
LINK is sending obsolete values to the configured BACnet devices in STOP mode.
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