300911

Common Causes

• The mutual comparison of the two monitoring channels has found a difference between input data or results of the monitoring operations.
• One of the monitors no longer functions reliably, i.e. safe operation is no longer possible

Troubleshooting Steps

1. 1Please inform the authorized personnel/service department.
2. 2Find the difference between the monitoring channels.
3. 3The error code indicating the cause is displayed as follows: - On the 840D it is output in the alarm text.
4. 4On the 840C MD 301: diagnostics for STOP F - On the 611D MD 1395: $MD_SAFE_STOP_F_DIAGNOSIS (diagnostics for STOP F) You can find the meaning of the error code as follows: - On the 840D: description of alarm 27001 - On the 840C: description of alarms 1336* / 2097* A possible cause is that the safety-related machine data are no longer identical or that the SGEs do not have the same level (recalibrate or check in the SI service display).
5. 5If no error of this type is apparent, an error may have occurred in the CPU, e.g. a "flipped" memory cell.
6. 6This error can be temporary (in this case it can be eliminated by a POWER ON) or permanent (if it occurs again after POWER ON replace the hardware).
7. 7Clear alarm with the RESET key. Restart part program 2-769