Time Stamping
Original instructions
About us
Summary
In an M580 configuration, alarm bits provided by the module can be time stamped. For detail refer to the System Time Stamping, User Guide.
Using the Data Editor screen in Control Expert, the module device DDT enables selecting the alarm bit to time stamp and to assign the trigger condition.
Limitation and Performance
The event detection is processed on both value changes edge (rising and falling). No selection of transition edge is possible in the PLC system time stamping.
The events are detected and stamped at the same rate as the PLC task (only the MAST task).
NOTE: Time stamping of the alarm bits (ST_ALARM_•••) can only be set directly on the variable bit address (%I). The IODDT structure does not enable such setting for the same bits.