Control And Status Information - Siemens SIMATIC PN/J1939 LINK Operating Instructions Manual

4.5

Control and status information

Controller information
The following control information is cyclically transmitted from the S7 controller to
PN/J1939 LINK:
Table 4- 3
Bit
7 to 1
0
Status information
The following status information is cyclically transmitted from PN/J1939 LINK to the
S7 controller:
Table 4- 4
Bit
7 to 2
1 to 0
1) The error counters customary in CAN and their associated thresholds are internal functions that are
not visible to the user.
Note
For values made up of multiple bits, the first bit is the MSB and the last bit is the LSB.
Example: Bit 1 to 0 = "2" means that bit 0 = "0" and bit 1 = "1".
SIMATIC PN/J1939 LINK
Operating Instructions, 12/2018, A5E45307564-AA
Structure of the control information in the PROFINET IO data (from S7 controller to
PN/J1939 LINK, 1 byte)
Meaning Value
Reserved 0 --
Control bit 0 No CAN commu-
nication
1 CAN communica-
tion active
Structure of the status information in the PROFINET IO data (from PN/J1939 LINK to
S7 controller, 1 byte)
Meaning Possible values
Reserved -- --
State of the 0 OFF
CAN con-
1 Bus off
troller
2 Error passive
3 Error active
4.5 Control and status information
Note
Value must be "0"
The CAN controller should be in the "OFF" state.
The CAN controller should be in the "ON" state.
Note
--
When specified accordingly by the S7 controller.
Error counter has exceeded the specified thresh-
1)
old or PN/J1939 LINK takes more than 2 seconds
to synchronize to the CAN bus.
As a result, the PN/J1939 LINK no longer
sends/receives packets.
Error counter has reached the specified threshold.
1)
PN/J1939 LINK continues to send / receive pack-
ets.
Error counter is below a specified threshold.
1)
This is the normal state. Everything is okay.
Functions
25