That is way too many alarms for a single RUT9 device, especially when you need to send SMS messages.
A single alarm supports up to 16 telephone numbers.
Regarding Modbus Alarms, there is no specific WebUI limitation on the number of alarms you can configure. However, configuring too many alarms may lead to functionality loss, missed messages, and other device issues.
To ensure satisfactory behaviour and avoid potential problems, it is recommended to leave a few seconds intervals between SMS messages (around 4-5 seconds). This means that the number of alarms should be kept on the lower end.
To find the optimal number of alarms for your device, I suggest configuring Modbus Alarms and monitoring the performance. If you notice any issues, try reducing the number of alarms slightly until the device operates smoothly.