Siemens SIMATIC PN/BACnet LINK - Page 34

Functions
4.3 Cyclic data exchange between controller and PN/BACnet LINK
PN/BACnet LINK
34 Operating Instructions, 10/2017, A5E39895543-AA
Status and control information of BACnet client
The PN/BACnet LINK cyclically transmits the following status information to the S7
controller:
Table 4- 3 Status of the client functionality (1 byte input address)
Bit
Meaning
Value
Remarks
1 ... 7
Not used
--
--
--
0 Current status of the
client functionality
0 Client function
OFF
The S7 controller can read the current
status of the Client functionality of the
PN/BACnet LINK via bit 0. The read
status indicates whether the transmis-
sion of the I/O data between the S7
controller and BACnet is switched on
or off.
1 Client function
ON
The S7 controller cyclically transmits the following control information to the PN/BACnet
LINK:
Table 4- 4 Control byte for the client functionality in the PN/BACnet LINK (1 byte output address)
Bit
Meaning
Value
Remarks
1 ... 7
Not used
--
--
--
0 Control the client func-
tionality
0 Switch off client
function
The client functionality of the
PN/BACnet LINK can be switched on
or off by the S7 controller via bit 0. The
transmission of the I/O data between
the S7 controller and BACnet is
switched on or off by this.
1 Switch on client
function
Note
Several seconds can pass after switching the client functionality on or off using the c
ontrol
byte before the corresponding actions are completed in the PN/BACnet LINK. The time
required for this process depends, among other things, on the size of the configuration and
the response times of the addressed BACnet devices. The PN/BACnet LINK in
dicates
completion of these actions by updating the corresponding status information in the status
byte.