Monitoring Functions - Siemens Simatic Operating Instructions Manual

Functions
4.1 CANopen
If RDREC returns no error, the S7 user program can evaluate the data transmitted by the
PN/CAN LINK. The "Status code" field can have the following values:
Status code
0
1
2
3
4
255
Following an abort of SDO access (triggered by the PN/CAN LINK itself or by the slave
addressed via SDO), the "Additional information error code" field is filled with the SDO abort
code according to CiA 301.
The SDO access for the PN/CAN LINK is completed with the finished RDREC. The device is
then ready for a new SDO command. An additional RDREC without preceding successful
WRREC returns an error code.
4.1.2.4

Monitoring functions

The PN/CAN LINK supports the monitoring functions "Heartbeat" and "Node guarding" as
sender (producer) as well as receiver (consumer). One of these two monitoring functions
must be activated in the HSP.
Heartbeat
The PN/CAN LINK can be operated as heartbeat producer and as heartbeat consumer.
The required monitoring times (transmit interval, receive interval) can be configured
in the HSP.
Node guarding
A node guarding monitoring can be configured. The parameters required for this purpose
"Monitoring time" and "Repetition factor" can be set. The PN/CAN LINK can be both a
transmitter and a receiver.
34
Meaning
OK, SDO completed successfully
SDO aborted or not yet started because a reset was triggered by PROFINET or the
boot operation for the node was restarted
SDO aborted or net yet started because once the node was successfully booted it
had a heartbeat or node-guarding error
SDO started but aborted by the PN/CAN LINK (cause according to CiA 301 in error
code additional information)
SDO started but SDO abort received (received cause according to CiA 301 in addi-
tional information error code)
Busy = SDO access not complete yet. RDREC must be repeated.
SIMATIC PN/CAN LINK
Operating Instructions, 03/2018, A5E39895388-AB