1.Description
This module checks if a telegram has arrived within a certain time. Output 1 and Output 2 sends a telegram when the specified monitoring cycle time has expired. The reset input waits for a signal. If a signal arrives within the cycle time, Output 1 is reset. If the monitoring cycle has expired once, the watchdog module can be activated again via an ON telegram on the reset input or the switch on/off input.
2.Inputs
| No. | Name | Initialisation | Description |
|---|---|---|---|
| 1 | E1 Mon. Cycle (sec.) | 0 | Monitoring cycle in seconds - specifies the cycle time in seconds. |
| 2 | E2 On/Off | 0 | Switch on/off - activates or deactivates the watchdog module. A value not equal to zero switches the module on. A value equal to zero switches the module off. |
| 3 | E3 Reset | 0 | Reset - if this input receives a telegram (independently of the value), the monitoring cycle is set to the zero value. The cycle begins again. |
3.Outputs
| No. | Name | Initialisation | SBC | Description |
|---|---|---|---|---|
| 1 | A1 (sbc) | 0 | sbc | Sends a 1 after expiry of the cycle time if no telegram arrived at the reset input. A 1-bit value is output. |
| 2 | A2 neg (sbc) | 0 | sbc | Sends a zero after expiry of the cycle time. A 1-bit value is output. |
s = send, sbc = send by change
4.Value table as an example
| Point in time in seconds | Cycle | ON/OFF | Reset | Output 1 sends | Output 2 sends |
|---|---|---|---|---|---|
| Start | 10 | 1 | - | 0 | 1 |
| 7 | 10 | - | 1 | - | - |
| 16 | 10 | - | 1 | - | - |
| 26 | 10 | - | 0 | 1 | 0 |
5.Other
| Recalculation during start: | Yes |
|---|---|
| Module is retentive: | No |
| Internal designation: | 9031 |
| Category: | Additional modules |