Siemens SIMATIC PN/BACnet LINK - Page 33

Functions
4.3 Cyclic data exchange between controller and PN/BACnet LINK
PN/BACnet LINK
Operating Instructions, 10/2017, A5E39895543-AA
33
Status and control information of BACnet server
The PN/BACnet LINK cyclically transmits the following status information to the S7
controller:
Table 4- 1 Current status of the server in the PN/BACnet LINK (1 byte input address)
Bit
Meaning
Value
Remarks
7 Status of the con-
nection from the
PN/BACnet LINK to
the S7 controller
0 S7 controller has no
connection with the
PN/BACnet LINK
If the connection between the S7
controller and the PN/BACnet LINK
is interrupted, this bit is automati-
cally set to 0 by the S7 controller.
1 Cyclic data exchange
takes place
5 … 6
Not assigned
--
--
--
4 Error bit for feed-
back on control
action
0 No error, control in-
formation taken over
A feedback message to a per-
formed control action is output via
bit 4.
In the event of an error (bit 4 = 1),
the current control information is
not applied. The current system
status remains unchanged.
1 Error, control infor-
mation not applied
0 ... 3 "System_Status" of
server
0
OPERATIONAL
The S7 controller can read out the
current system status of the Server
function on the PN/BACnet LINK
via the value in bits 0 to 3.
1 OPERATIONAL_REA
D_ONLY
4
NON_OPERATIONAL
The S7 controller cyclically transmits the following control information to the PN/BACnet
LINK:
Table 4- 2 Control byte for the server functionality in the PN/BACnet LINK (1 byte output address)
Bit
Meaning
Value
Remarks
4 ... 7 Not used -- -- --
0 ... 3 Controlling the
"System_Status"
0
OPERATIONAL
The S7 controller can control the
current system status of the server
function via the value in bits 0 to 3.
This control byte also influences
the "Status_Flags" properties.
1 OPERATIONAL_REA
D_ONLY
4 NON_OPERATIONAL