Control And Status Information - Siemens Simatic Operating Instructions Manual

Functions
4.2 CAN transparent
4.2.4

Control and status information

Control and status information
The following controller information is cyclically transmitted by the S7 controller to the
PN/CAN LINK:
Table 4- 8
Bit
7 ... 1
0
The following status information is transmitted cyclically from the PN/CAN LINK to the S7
controller:
Table 4- 9
Bit
7 ... 3
2
1 ... 0
1) The error counters customary in CAN and the associated thresholds are internal functions that are
not visible to the user.
46
Controller information in the PROFINET IO data (from S7 controller to PN/CAN LINK, 1
byte)
Meaning Possible values
Reserved 0 Values must be "0"
Control bit 0 No CAN communication
1 CAN communication active
Status information in the PROFINET IO data (from PN/CAN LINK to S7 controller, 1
byte)
Meaning Possible values
Reserved -- --
Group status 0 Not all configured receive mes-
of all data sages have been received at
least once since the last transi-
tion to "ON".
1 All configured receive messag-
es have been received at least
once since the last transition to
"ON".
State of the 0 Off
CAN control-
1 Bus Off
ler
2 Error Passive
3 Error Active
Note
--
The CAN controller should be "OFF".
The CAN controller should be "ON".
Note
--
--
As specified by the S7 controller
Error counter has exceeded the
1)
specified threshold, or PN/CAN LINK
needs more than 2 seconds to syn-
chronize itself to the CAN bus.
As a consequence, the PN/CAN
LINK stops transmitting/receiving
packets.
Error counter has reached the
1)
specified threshold.
PN/CAN LINK still transmits / re-
ceives packets.
Error counter is below a specified
1)
threshold.
This is the normal state. Everything
is okay.
SIMATIC PN/CAN LINK
Operating Instructions, 03/2018, A5E39895388-AB