Response To Errors - Siemens Simatic Operating Instructions Manual

Functions
4.2 CAN transparent
4.2.7

Response to errors

Configured CAN messages
If communication fails when communicating via configured CAN messages, the last
transmitted values continue to be valid. Data contents remain valid until a new value is
present.
If the length of a received CAN package does not match the configured length, the data are
not applied and a corresponding diagnostic message is sent to the S7 controller.
Diagnostic information
The PN/CAN LINK sends diagnostic information to the S7 controller with the usual
PROFINET methods.
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.
LEDs
In "CAN transparent" mode the PN/CAN LINK signals its state by means of the fieldbus
LEDs on the front of the housing. The meaning of the LEDs is described in section Operating
state of the PN/CAN LINK / PROFINET diagnostics (Page 95).
56
SIMATIC PN/CAN LINK
Operating Instructions, 03/2018, A5E39895388-AB