Vidmas30 Posted June 8, 2012 Report Share Posted June 8, 2012 Good day, Couple of days ago had an issue with Cinterion GSM modem: V570 controlls a steam boilers feed water and deaerator. Done some alarm SMS and one status message for myself (when I send "status" to V570 it send me back information about process) The issue was when I changed SMS configuration file and forgot to reboot PLC. Then, when I send a message for status, PLC hanged up (there was a black screen with error message) It was good that I was near. Then after reboot it worked fine, but now I'm afraid to use this feature because don't want PLC to hang again because steam is for production line and it's hard for personnel to start boiler after stopping and theres over 100km to go to that plant.. Yesterday sent several messages, everything was fine, but today one time PLC did't respond. Called to plant asked to go to PLC to see if everything's fine: it all looked good. So question: why in souch case PLC don't responded? Is it normal? Can't calm myself.. 1 Quote Link to comment Share on other sites More sharing options...
Ofir Posted June 10, 2012 Report Share Posted June 10, 2012 Hi, First make sure that you are using the latest system files of the V570 according to VisiLogic. PLC not reponding to the SMS message can be caused if: - The message was not sent exactly as configured in SMS configuration. - Signal quality was under 13 Anyway you can check status message operand of SMS configuration - see help SMS operands. If you are able to simulate the error you got please send a mail with the application to support@unitronics.com and we will check it. Quote Link to comment Share on other sites More sharing options...
stembera Posted June 26, 2012 Report Share Posted June 26, 2012 One suggestion: If you send text message from your phone to PLC side, use SMS with confirmation. Sometimes your message is not delivered to a modem at all. I experienced that situation in some areas with weak GSM signal, e.g. in mountains or rural areas. Quote Link to comment Share on other sites More sharing options...
Pottunaama Posted December 3, 2014 Report Share Posted December 3, 2014 Can somebody tell us what is acceptable signal quality? For example, is SI 185 (in V120) value 18 acceptable quality? In what range are the signal quality values? Thanks! Quote Link to comment Share on other sites More sharing options...
Ofir Posted December 3, 2014 Report Share Posted December 3, 2014 Hi, According to my experience the signal quality range is from 1 to 31 (31 means best signal quality) and usually when the signal is below 11 we suggest to reposition the antenna. 18 should be good enough. 1 Quote Link to comment Share on other sites More sharing options...
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