> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/variablengruppe/register_serviceaufzeichnung.md).
# Service recording tab
Enabling service recording for this variable
Note
If the external variable is used for one or more process variables, it is not possible to disable service recording.
### Variable type Binary value
The external variable records ON/OFF pulses in the form of 0 and 1. ACRON can calculate the daily value by addition for the elapsed time from the time spans in which the value = 1. The days value for switching cycles is calculated by adding the switches from 1 to 0 for the day in question.
The elapsed time is calculated from the sum of the time units in which the value of the variable is **1**.
A switching cycle is defined by the cycle **0 - 1 - 0** (switching on and off).
| | |
| ------------------------------ | ------------------------------------------ |
| Elapsed time for this day: | 22 time units => 22\*30 minutes = 11 hours |
| Switching cycles for this day: | 10 |
### Variable type Elapsed time counter
From the count values delivered from the control system the external variable stores the last valid value of the day in question as the current counter reading for the [elapsed time](https://github.com/Dataforum-Software/gitbook/blob/master/acron/9.3/en/designer/glossar/laufzeit.md) (daily value).
The daily values are then added to the daily value of the previous day. The scheduled actions are determined in two steps:
* Determine the difference between the current value and the value at the time of the last activity
* Compare the difference value with the preset interval value
### Variable type Switching cycles counter
From the count values delivered from the control system the external variable stores the last valid value of the day in question as the current number of [switching cycles](https://github.com/Dataforum-Software/gitbook/blob/master/acron/9.3/en/designer/glossar/laufzeit.md) (daily value).
The scheduled actions are determined automatically based on differentiation/addition of the sums of the daily values and cross-checking against the interval defined for the action.
### Counter overflow value
If an overflow value is defined, the value is included in the calculation.
Otherwise the difference amount between the overflow and the last value is not included in the calculation.
Note
on elapsed time counters
As data is recorded only daily, note the following with regard to the overflow value:
For the unit 'hours' the entered value must be > 24; for the unit 'minutes' > 1440 (24 \* 60); and for the unit 'seconds' > 86400 (24 \* 60 \* 60).
### Unit of the counter
Selection of the unit delivered by the control system.
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