Error Detection

Detected Internal Module Errors

The red SE LED indicator makes it possible to evaluate the following error states:

  • Detected internal module error (hardware error)

  • Over/under temperature

  • Over/under voltage

  • Incompatible firmware version

The wiring issues described in the section Connections examples are detected using the red I/O channel LED indicator.

NOTE: Errors that occur within the module are detected according to the requirements of the relevant standards and within the minimum safety-related response time specified in the technical data of the EcoStruxure Machine Expert - Safety software.

After an error within the module is detected, the module reverts back to a defined safe state.

NOTE: The error detection time specified in the technical data is relevant only for detecting external errors (for example wiring errors) in single-channel structures.

External Wiring Errors

Recognizable errors are detected by the module within the error detection time.

If a module detects an error, then:

  • The channel LED indicator is lit constantly red

  • The SafeChannelOKxx signal is set to SAFEFALSE.

  • The SafeDigitalInputxx or SafeDigitalOutputxx signal is set to SAFEFALSE.

  • An entry is generated in the Safelogger of EcoStruxure Machine Expert.

Other errors that are not detected by the module (or not detected on time) may lead to unintended machine states and therefore must be uncovered using additional measures.

 WARNING
UNINTENDED EQUIPMENT OPERATION
Be sure that your risk assessment takes into account errors which are undetectable by the Safety I/O module, and that appropriate additional measures are implemented according to your risk assessment.
Failure to follow these instructions can result in death, serious injury, or equipment damage.

For more information on errors that are, and are not, detected by the Safety I/O module, refer to the table for error detection in the Connection Examples hereafter.

Make all necessary repairs in a timely manner if an error occurs because subsequent errors could create a hazardous situation.

 WARNING
UNINTENDED EQUIPMENT OPERATION
  • Immediately replace any and all modules that indicate that they are in an inoperable state.
  • Ensure that the effect on un-repaired equipment is taken into account in your risk assessment.
  • Make all necessary repairs to equipment before re-starting, or continuing service of, your machine.
Failure to follow these instructions can result in death, serious injury, or equipment damage.