## Log microblocks Log microblocks record system values, such as trends, alarms, and runtime values.
| Digital Trend This microblock records data for trend purposes from microblocks that do not support built-in trending.
| Analog Trend This microblock records data for trend purposes from microblocks that do not support built-in trending.
| Digital Trend with Sample Trigger This microblock records data for trend purposes. When the rec input goes from off to on, the TRND input records the current state. Data is not recorded again until the next time the rec input transitions from off to on.
| Analog Trend with Sample Trigger This microblock records data for trend purposes. When the rec input goes from off to on, the TRND input records the current value. Data is not recorded again until the next time the rec input transitions from off to on.
| Runtime Monitor This microblock monitors the amount of time that a piece of equipment has been running and provides an output that can be used for notification when the runtime limit is exceeded.
| BACnet Alarm This microblock transmits alarms and supplemental data from the control program to the system's alarm management system. An alarm generated by this microblock is time-stamped with the time the alarm was generated.
| History Recorder This microblock records a current and previous value from a microblock in a control program. You determine when the value is recorded.
| High Peak Recorder This microblock records the highest and previous highest value of a microblock in a control program. You determine when the values are recorded and when the highest value is transferred to the previous highest value.
| Low Peak Recorder This microblock records the lowest and previous lowest value of a microblock in a control program. You determine when the values are recorded and when the lowest value is transferred to the previous lowest value.
| Runtime Accumulation This microblock calculates the amount of time, in hours, that a piece of equipment has been running.