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From: styrum on 23 Dec 2005 16:51 OK, it works now, but writing works only when the PLC is in the Run state and the switch is in Term. Looks like reading inputs works in all modes and switch positions though. I wonder if I can at all write to the outputs when the switch is in Run. Because the PLC manual warns that after the supercapacitor discharges when the power comes back on it is unknown whether it will go into Run or Program mode. So it is highly desirable to be able to write to the inputs with the switch in Run.
From: Tushar Jambhekar on 24 Dec 2005 00:10 Hi srinivas we are in the Modbus Datalogger development for quite a long time now. and we have lot many of the shelf applications available with us. if you are interested in complete solution. please contact me on 09823015765. we can provide you the apllication accustomed for you needs along with the source code.
From: Donald on 24 Dec 2005 01:10 Anonymous wrote:... I wonder if I can at all write to the outputs when the switch is in Run. No, you can't write to the outputs/V-memory/anything when the mode switch is in the RUN position. When the DL-05 (and -06,-205, -350, etc.) manual discusses mode switch positions (Chapter 4) and says "No changes are allowed by the attached programming/monitoring device" in the RUN and STOP positions, it really means no changes. ... Because the PLC manual warns that after the supercapacitor discharges when the power comes back on it is unknown whether it will go into Run or Program mode. So it is highly desirable to be able to write to the inputs with the switch in Run. There is the <a href="http://web5.automationdirect.com/adc/Shopping/Catalog/PLC_Hardware/DirectLogic_05/Specialty_Modules/D0-01MC" target="_blank">D0-01MC</a> memory cartridge option which seems to be the only way to add battery backup to the DL-05. I don't remember it existing 5 years ago (when I last considered the -05) and don't know much about it. Good luck.
From: Tushar Jambhekar on 26 Dec 2005 08:13 Hi Rujuta Please send me your mailID as well as contact number. Our dataloggers features are as follows Real Time Display and analysis Data Trending bulk downloading device aliases (multiple aliases for single device based on register partitions) Mltiple(configurable) logging targets etc etc etc... if you want to have further information you can contact me on 09823015765 or you can mail me on tushar(a)vidishaconsultancy.co.in
From: styrum on 28 Dec 2005 11:05
Page 4-29 of the manual also says that there is bit 13 in V7633 which can be used to force the PLC into Run when the switch is in Term position: "Location can also be used to set thepower-up in Run Mode option." I think I will have to rely on that. |