Functions
5.2 CAN transparent
SIMATIC PN/CAN LINK
68
Operating Instructions, 03/2022, A5E39895388-AC
5.2.4
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 5- 8
Controller information in the PROFINET IO data (from S7 controller to PN/CAN LINK, 1
byte)
Bit
Meaning
Possible values
Note
7 … 1 Reserved
0
Values must be "0"
--
0
Control bit
0
No CAN communication
The CAN controller should be
"OFF".
1
CAN communication active
The CAN controller should be
"ON".
The following status information is transmitted cyclically from the PN/CAN LINK to the S7
controller:
Table 5- 9
Status information in the PROFINET IO data (from PN/CAN LINK to S7 controller, 1 byte)
Bit
Meaning
Possible values
Note
7 … 3 Reserved
--
--
2
Group status of
all data
0
Not all configured receive messages
have been received at least once
since the last transition to "ON".
--
1
All configured receive messages
have been received at least once
since the last transition to "ON".
--
1 … 0 State of the CAN
controller
0
Off
As specified by the S7
controller
1
Bus Off
Error counter
1)
has exceeded
the specified threshold, or
PN/CAN LINK needs more than
2 seconds to synchronize itself
to the CAN bus.
As a consequence, the PN/CAN
LINK stops
transmitting/receiving packets.
2
Error Passive
Error counter
1)
has reached
the specified threshold.
PN/CAN LINK still transmits /
receives packets.
3
Error Active
Error counter
1)
is below a
specified threshold.
This is the normal state.
Everything is okay.
1) The error counters customary in CAN and the associated thresholds are internal functions that are
not visible to the user.
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