Response To Errors - Siemens Simatic Operating Instructions Manual

Functions
4.1 CANopen
4.1.4

Response to errors

Diagnostic information
When an error occurs, the corresponding error LED on the CAN side (ERR-LED) is
triggered. A corresponding diagnostic message is sent on the PROFINET side. The
diagnostic message can be read out with the TIA Portal.
Information on the events that trigger a diagnostic message is available in the section Events
that trigger a diagnostic message (Page 99). Section Diagnostic messages (Page 102)
includes a detailed description of the error that triggers the diagnostic message and possible
measures. This information is also stored in the TIA Portal.
Failure of communication via PDOs
When communication via PDOs fails, the values in the corresponding OD entries remain
valid. Data contents remain valid until a new value is present.
Failure of a CAN node
The failure of a fieldbus node as well as bus problems on the CAN side are signaled to the
S7 controller using diagnostic information.
Error Register
The Error Register entry (OD 1001h) indicates the current error state of the device.
The PN/CAN LINK uses the following bits from this entry:
Bit
7
4
0
42
Meaning
Manufacturer- Bit is set when the PN/CAN LINK is configured as "CANopen Slave" and
specific error the control bit transmitted by the S7 controller in the cyclic data is "OFF".
Communication Bit is set when
error
the S7 connection fails
•
the PROFINET connection (Application Relation) has been terminated
•
the data from the S7 controller has the IO provider status "Bad".
•
Generic error Bit is set in "any error situation", according to CiA standard "CiA 301",
which means when a specific error bit is set and for errors that are not
mapped to specific error bits.
SIMATIC PN/CAN LINK
Operating Instructions, 03/2018, A5E39895388-AB