Logical scheme in the monitoring system
In the "Logical Scheme" menu of your Ethernet-based Didactum monitoring system, you can define automated actions. The actions and alarms defined under "Logical Scheme" for Didactum monitoring systems are linked to IF THEN conditions. These IF THEN conditions can be combined with AND and OR. Furthermore, "time limits" and/or "repetitions" can be set. Please note that the rules and actions defined in the "Logical Scheme" only function if the previously defined conditions are met. Otherwise, the rule will not be executed!
Note:
If identical actions are to be executed for multiple elements/sensors, the "Group" function is recommended.
If a sensor changes its state very rapidly (e.g., a Didactum vibration detector), the element's state can switch from "Warning (low)" to "Alarm (high)" and vice versa without passing through the other states "Warning (high)" and "Normal." Please note that certain elements/actions such as "Email" and "SMS Sending" will only be displayed in the WebGUI of the Infrastructure Monitoring System if they have been previously configured and tested under "System Tree".
Monitoring the server cabinet
In our example we monitor a server cabinet containing mission‑critical network, backup, and server equipment. The fans installed in the 19 inch rack must be switched on as soon as the internal temperature of the IT rack reaches +35 °C. If the internal temperature in the server cabinet reaches the critical +44 °C mark, the fans must be activated, the alarm siren including strobe light must be switched on, and the responsible administrators and technicians must be notified simultaneously via e‑mail and SMS.
For cabinet monitoring, the proven Didactum Rack Monitoring System 100 IV was installed with the following equipment:
| # | Equipment | Description |
|---|---|---|
| 1 | Didactum temperature sensor | Temperature sensor installed inside the 19” server rack. |
| 2 | Power‑1 Didactum monitor | 12 V relay output no. 1 for controlling the cabinet fan. |
| 3 | Power‑2 Didactum monitor | 12 V relay output no. 2 for the alarm siren with strobe light. |
| 4 | E‑Mail alarm Admin | User‑defined e‑mail alarm notification to the administrators. |
| 5 | SMS alarm Admin | User‑defined SMS notifications to the administrators. |
Configure relay outputs of the monitoring system
In the web interface under "Power 12V 0.25", you will see the two switchable relay outputs of your Rack Monitoring System 100 IV. As an example, we will now configure the fan system of the 19-inch server rack connected to relay output no. 1. The alarm siren with built-in strobe light connected to relay no. 2 will be configured by you and named "Alarm siren with strobe light".
Create logical scheme no. 1
In the web GUI under "Logical Schema," we now create the first rule/logic for our rack monitoring system. Here, we define that if the internal temperature in the IT rack reaches +35 degrees Celsius, the rack fan connected to relay output No. 1 will be automatically switched on. So: "If" ("IF") "Server Rack Temperature Sensor" is in the "Warning (High)" state, "then" ("THEN") "Server Rack Fan" should be set to the "On" state. We name the rule "Alarm Rule No. 1 Rack Monitoring" and click "OK."
Create logical scheme no. 2 for rack monitoring
Now we create the second logic for monitoring our 19-inch server rack. We name this "Alarm Rule No. 2 Rack Monitoring". It goes like this: "If" ("IF") "server rack temperature sensor" is in the "Alarm (high)" state, "then" ("THEN") "server rack fan system" to the "on" state, "AND" ("AND") "alarm siren with strobe light" to "on", "AND" ("AND") "email alarm", AND" ("AND") "SMS alarm via LTE modem" to the responsible IT managers, admins, and technicians.
Logical scheme no. 3 upon reaching normal temperature in the IT rack
The third logic switches off the "server rack fan system" and the "alarm siren with strobe light" when the temperature inside the server rack drops back to "normal". The "normal" state of the temperature sensor lies between the two thresholds "warning level (low)" and "warning level (high)" (see settings in the system tree under "server rack temperature sensor"). In our example, this is below +35 degrees Celsius. So: "If" ("IF") the "server rack temperature sensor" is in the "normal" state, "then" ("THEN") the "server rack fan system" is in the "off" state, and "AND" the "alarm siren with strobe light" is switched off. We'll call this third logic "Alarm Rule No. 3 Rack Monitoring". Afterward, click "OK" and then the floppy disk icon (top right). Done!