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  1. SIMATIC OP7 RAM failure

    In our SIMATIC OP7 console ram failure message is appering while power on, do anybody know about the problem and its remedy ?
  2. Dear all, I have implemented PID temperature control for mini heating tank system using Siemens S7-313-c2-DP PLC. Now, I want to plot the values of the "process value (temperature) " and "Setpoint" as a function of time in wincc flexible runtime. I am using wincc flexible 2008 advance SP3. However, the problem is that I have tried plotting the value of "process value" as a function of time using trendview, But the change in the value is not smooth i.e. it is in step manner. Besides, the value of temperature progresses towards the left side of the graph, but I want it in the right side. And also I would like to plot two values against time in one graph in smooth transition so that I can make the comparison and I want the plotting only on the right side of graph. So, how to do all these things? Since, I am a newbie to WinCC, I would appreciate your help. Thank you. Regards, Ankur Gajjar
  3. Hi there, I have trouble understanding the "mechanics" of STL programming language for Siemens S7-300 PLC. For instance I have a code which looks like this (taken from the Siemens manual for extended pulse timer): With regards to the first line, AND operator checks whether the state of I 2.0 is '1'. According to the "Bit Logic Instructions" manual, it also ANDs the test result with RLO. Now the question is - what RLO is it if there are no operations beforehand? What memory area does it use for that particular RLO? Moreover, what is the Boolean bit logic string in this case? I presume it is all the lines up to the '=' sign. The confusion is also caused by instructions (FR, L, T) which are not logical operations or RLO, although there is associated memory bit with them. I'd be grateful if you could clarify this matter? Many thanks!
  4. Daily logging of flow in WinCC

    Hello, I am working on a Siemens S7-300 PLC with a WinCC HMI and I am looking to perform logging of certain values every 12 or 24 hours. Basically I have a Flow meter that constantly has flow through it. Right now I have the PLC set up to record the current value of the flow, as well as a totalizer to indicate how much flow has gone through the valve. (until an operator chooses to reset it) I need to create some sort of logic or utilize something in WinCC to calculate the flow through the valve only for that day. After that day, the value will be either deleted or replaced with a new value the next day... If anyone has any tips or advice it would be greatly appreciated. Thank you,
  5. I wonder if there is version of Ethernet Remote IO that can be used with 115VAC supply rather then 24VDC? This would save me a power supply which is really needed for this module only.
  6. How to read digital input signal

    Hello everyone, I am a freshman, studying about PLC. I work with S7-400 system. Please help me how to read digital input signal directly from humidity sensor using PLC. Thank you so much. Best regard!
  7. Dear All, I have a little problem in reading data from Power Meter to Vijeo Citect v6.0 I'm using Schneider PM810MG for Energy reading from Power Meter and for the SCADA I'm using Vijeo Citect v6.0. I can do some simple data reading like current, voltage and the others using variable tags from Vijeo Citect with Data type INT. But i dont know how to read the data for "Real Energy In" since the data range from 0 to 9,999,999,999,999,999. Waiting for all your help soon. Thx. Best Regards, Budiman Chandra
  8. can anyone please provide me how to communicate between keithley controller 2182A(nano voltmeter) and any siemens plc.aslo the programme & instruction & parameters..ASAP using RS-232 interface?
  9. Lenze drive fault on proface

    Hi I am having a problem with an error/fault code. The fault comes from a lenze drive as an integer. We have a proface HMI monitoring a DBW in the siemens S7 300 that holds the lenze fault code. The PLC comes up with a generic code "lenze drive fault". The proface comes up with the drive code. I would like the PLC to produce a fault description using the lenze fault code in the DBW, instead of the generic one [listed above]. could anyone please help with this problem Thanks Robbo