1.Description
This module checks if a telegram has arrived within a certain time. If this is the case, the monitoring cycle starts again. Output 1 and Output 2 sends a telegram when the specified monitoring cycle time has expired. The reset input waits for a signal. If no signal is received within the cycle time, a 1 is sent to output 1 and a 0 to output 2 at the end of the cycle time. 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 |