LED Status Displays¶
The status of the PROFIBUS® Communication Module is displayed by means of 5 status LEDs. After power ON, the Communication Module initializes a self-test. If this test was successful, the yellow RDY LED goes ON. Otherwise the LED starts flashing and aborts the further initialization. If the RDY LED remains OFF, the Communication Module is defective.
In the course of initialization, the RUN LED is OFF for the first time. The LED is only activated after configuration data has been sent to the Communication Module and the operating mode of the Communication Module was set. If the operating system of the Communication Module detects a parameterization or a a configuration error, the green RUN LED flashes non-cyclically. If this LED flashes cyclically, the Communication Module is ready for communication, but the communication is not active yet. In case of an active communication, the RUN LED lights continuously.
The red ERR LED indicates errors on the PROFIBUS® interface.
In the “DP slave” operating mode, the yellow STA LED indicates the active I/O data exchange with the DP master. In the “DP master” operating mode, the STA LED indicates the ownership of the token and therefore the I/O data exchange with the involved DP slaves.
During the initialization procedure and also if the Communication Module is configured (anew) - in particular if the operating mode was changed - it can occur that all or some LEDs light up for a short period of time, before reaching a defined condition.
| LED | Color | Status | Meaning |
|---|---|---|---|
| PWR | green | ON (light) | Voltage is present |
| OFF (dark) | Voltage is missing | ||
| RDY | yellow | ON | Communication module is ready |
| flashes cyclic | Bootstrap Loader is active | ||
| flashes non-cyclic | Hardware or system error | ||
| OFF | Defective hardware | ||
| RUN | green | ON | Communication is running |
| flashes cyclic | Ready for communication | ||
| flashes non-cyclic | Parameterization error | ||
| OFF | No communication | ||
| STA | yellow | ON | DP master: Transmits data or token on the network |
| OFF | DP master: no token | ||
| ERR | red | ON | PROFIBUS® error |
| OFF | No error |