Crossbow

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Posts posted by Crossbow


  1. The variable mapping can also change if the name of the PLC CPU was changed.  Perhaps when you went online to transfer to the CPU it asked about setting the controller name, and you picked to keep the name from the controller?

    In the mapping you can see the name of the controller is part of the AT column, which shows the mapping to the controller. 

    You may also see something similar after uploading from the HMI, look under the Device References in the Multiview Explorer and see if there are two, one showing an error.  Go into that one and click 'Relink Controller' or something along those lines, and it will combine the two and fix the errors.


  2. OPC servers are for collecting data.  You still need a package to read the data from the OPC server into Visual Studio.  I am not sure what method you intend to use for that.  You may be able to not work with an OPC server and just find communication software for HostLink to VS directly.


  3. I disagree with Bob on the hub, switches (unmanaged even) are the way to go for traffic considerations.

    First, did you set a unique IP address on each device?  All of my PLCs come out of the box with the same address set, and that's not going to work when networked.


  4. You need to provide a whole lot more information.  What robot to start with?

    In most cases, the answer is NO.  The robot is not a web server.  What you would need to do is collect information on the robot's current position and then create your own way to display that information.


  5. Safety should not have been down when that error occurred.  As you said, I am pretty sure the EIP is only for monitoring and does not affect the safety operation.  This device is too old to offer CIP Safety, only the NX-SL5500 and SL5700 have that.


  6. I believe S7-200 also offered a memory card option that plugged into the front... It's possible your program is on the card and it can simply be moved to the new unit.

    But I don't recall and haven't touched a Siemens PLC since 2005... job change.  Did install several of these back in the day though.  Nice little PLC and great software.


  7. On 2/2/2022 at 3:01 PM, Rodney said:

    The sink or source is selectable by the S/S connection if 0 volts is connected then 24 volts is the input and if 24 volts is connected to S/S then 0 volts is the input.

     

    Pretty sure the FX0N-24MR does not have an S/S terminal, while the FX0N-24MR/ES does.


  8. You can't use C252 because it uses the same inputs as your C251.  Review the chart posted above.  It shows if you want a second high speed input you need to use C253 or C255 with inputs X3 and X4.

    Only X0-X5 are high speed inputs.  You wanted a dual channel input, so there goes 2 inputs, X0, and X1, with X2 allowing a reset input.  Another dual channel input, there goes 2 more, X3 and X4, with X5 allowing a reset input.  That's all 6 high speed inputs used.

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  9. That's a hell of a markup, those PLCs were under $1000 even for the largest model.  If you can get MicroWin and the cable and get online, you may still be able to back up the existing program and source a similar PLC from someplace like Radwell.

    Keep in mind S7-200 is obsolete and was replaced by S7-1200, so support for it will be limited in the near future.


  10. There is a list in the manual for the device that shows which inputs can be used in which modes with high speed counters.  I think you can get 2 AB phase, to get to 6 you would need single phase encoders.  But it's very specific which inputs are used and which counter numbers they are attached to.  The manual should be in the downloads section here, I forget the number.


  11. SIL and PL ratings are for safety PLCs, not applicable to standard PLCs like NX1P2.

    Category and PL are defined by ISO 13849-1.

    SIL is defined by IEC 61508.

    The NX-SL safety controllers are rated SIL3, PLe