Deleting sms with JZ10 plc

[Petros]

Can anyone suggest why setting SB193 (deleting sms messages from sim card) does not do the job? Recently I had to visit a remote installation just to insert the sim card in a mobile phone to delete the messages. The system had just stopped accepting sms messages because the card was full. In the ladder, there is a weekly setting of SB193.

[Simon]

I have encountered this before, but I can't find the specific notes on what I did to "fix" it.

However, I am reasonably sure it is necessary to hold SB193 ON for a period of time, not just set it as a one-shot. The example in U90 Ladder help shows a direct contact being used.

My familiarity with modem comms also helps, as I am aware that deleting SMS messages from the modem must be done by sending the modem one command per message to be deleted. The commands take between half a second and one second each, so to delete 20 messages, SB193 should be on for about 20 seconds.

I hope this helps.

[Petros]

Dear Simon,

Thank you for your explicit reply. It seems that what you suggest may resolve the issue. However, I would appreciate a comment from a Unitronics technical person, and possibly an update on the help file......

Petros

[AlexUT]

You have to check if SMS in SIM memory are valid (defined in SMS Configuration). Not valid SMS stay in SIM memory and fill it.

In this case you have to schedule SMS memory clean. See Help description for SB 193 and SI 187.