TRb140 Alarm(SMS) using modbus master not working

Im using TRB 140 firmware version:- TRB1_R_00.07.02.7. Im facing problem with Alarm -SMS is not getting continuously some time is getting stop . We have taken alarm using Modbus master configuration and communication get brake after restarting the PLC is working fine.
Please confirm the limitation of Alarms like how many alarm we can configure ,Mobile number limitation.


Please update to the latest firmware - TRB1_R_00.07.04.4 and check if the behavior reappears, and the firmware you are currently using is outdated.

Best regards,