Operating Hours Counter¶
Description¶
The operating hours counter can record the operating hours of a device accurately to the second. There are a total of three operating hours counters. In addition to an operating hours counter for the operating hours since the start of the device, there is a total operating hours counter and a customer-specific operating hours counter that can be reset. The storage interval is configurable and the operating hours are not stored once 1000000 storage cycles have been reached.
Algorithm¶
While the counter is incremented every second, the storage interval doubles after each save operation. Starting with a save operation after 1 minute, then after 2 minutes, then after 4 minutes, then after 8 minutes, up to a maximum storage rate of 12 minutes.
The output of the operating hours can serve as a time control for the service interval as well as for preventative maintenance. Schedules for regular service can be tied to the operating hour values. Moreover, a high value of the total operating hours is indicative of intensive use of a device and possible deterioration of the performance. The risk of failure can be countered preventively through replacement.
Process Data¶
| Object ID | Name | Description | Direction |
|---|---|---|---|
| 0x001B (27) | Current Operating Hours | Output of the current operating hours counter | Input |
| 0x001C (28) | Total Operating Hours | Output of the total operating hours counter | Input |
| 0x001D (29) | Custom Operating Hours | Output of a user-defined operating hours counter | Input |
Also see section Process Data Profiles.
ISDU¶
| Name | Index | Subindex | Access | Length | Data Type | DataStorage | Default |
|---|---|---|---|---|---|---|---|
| Operating Hours Counter | 0x0057 (87) | 0 | R | 12 bytes | n/a | ||
| Current Operating Hours | 1 | R | 4 bytes | UINT32 | n/a | – | |
| Total Operating Hours | 2 | R | 4 bytes | UINT32 | n/a | – | |
| Custom Operating Hours | 3 | R | 4 bytes | UINT32 | n/a | – | |
| Operating Hours Saving Mode | 0x0074 (116) | 0 | R/W | 1 byte | UINT8 (ENUM) | Yes | 0 |
Current Operating Hours¶
This parameter saves the value of the operating hours since the last commissioning in seconds.
Total Operating Hours¶
This parameter saves the value of the operating hours since the first commissioning in seconds.
Custom Operating Hours¶
This parameter saves the value of the operating hours since the last reset in seconds.
Operating Hours Saving Mode¶
The current storage behavior can be set.
| Value | Meaning | Description |
|---|---|---|
| 0x00 (0) | Dynamic | The first save operation is performed 1 minute after switching on; the storage interval then doubles after every save operation. This is limited to a storage interval of 12 minutes. The intervals are 1, 2, 4, 8, 12 minutes. |
| 0x01 (1) | Static | Operating hours counters are stored every 12 minutes. |
System Commands¶
| Command Value | Device Action |
|---|---|
| 0x81 (129) | Application Reset – Resets Custom Operating Hours to the default value. |
| 0x82 (130) | Restore Factory Settings – Resets Custom Operating Hours and Operating Hours Saving Mode to the default value. |
| 0xA5 (165) | Maintenance Reset – Resets Custom Operating Hours to the default value. |
For an overview of all System Commands, see section System commands.