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Dave

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Posts posted by Dave

  1. EX-A2X Communication Problem

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Hi.

    I have a V570-57-T20B with V200-18-E1B, EX-A2X, EXL-CAB2000, IO-D16A3-TO16, IO-D16A3-RO16 & IO-DI16. System has been installed and running for approx. 6 months. ( Actually, two identical systems, with a third just being installed now). Yesterday, I was onsite to make some program modifications. I had connected to PLC but not made any changes. Everything was fine, until, right before my eyes the PLC stopped, screen went black with "expansion io error". LED's on EX-A2X indicated that power and comm were ok. The io modules connected to the EX-A2X had flashing run indicators and all I/O indicators were off. I used the visilogic to RESET the PLC and all seemed fine again, except the I/O modules still had flashing RUN LED's and were not functioning. I unplugged the cable from PLC to adapter....no change. The power and comm LED's were both still on. The PLC showed no errors and appeared to be running. Powered off a couple times to reboot....nothing changed. Did a "Initialize and reset" from visilogic....nothing changed. Eventually I swapped the adpter module with another one and everything was back to normal. I will return the EX-A2X for warranty replacement.

    My main concern, however, is the fact that the I/O module could be defective or even just unplugged and the PLC did not indicate any error. This could cause catastrophic machine failure should the PLC continue to run without a portion of the I/O functioning.

    Any ideas what can I do to make sure the the adapter is connected and functioning? I suppose I could pulse an output from the snap-in I/O to an input from one of the remote I/O and monitor that input. I am hoping for something that doesn't require additional wiring.

    Appreciate any thoughts on this.

    Dave

  2. Decoding Gray Code

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Can anybody help me with decoding a 12 bit, gray code output from an absolute encoder? There are 12 bits of rotaional position data and up to 12 bits of ``number of turns`` data, using 24 inputs total. I would like to convert the Gray Code value to a floating point value, scale it and display it. The scaling and displaying portion I have no problem with. I`m just not sure how to go about decoding the gray code(without writing pages and pages of logic). Any ideas would be much appreciated.

  3. HSC & Encoders with IO-D16A3-R016

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    I would like to use the high speed inputs on this module to connect and measure two encoders. (The reason being, it has a max frequency of 30Khz, where my snap-in module has only 10Khz.)Each encoder has quadrature outputs. When I look at the hardware configuration screen, I don't see "encoder" as an option. If I use the "High Speed Counter" option and connect my A & B outputs to the two associated inputs, how does the counter act?

  4. Pop-Up Keypads not Popping Up

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Thanks everyone for your input....I found the issue....I had added some alarm triggers in my ladder logic, but didn't finish configuring all of the alarms. Turns out I had an active "Show Alarm" function block, but there there was no alarm configured for the ID# specified, so it didn't appear on the screen. I could navigate through various screens no problem, but any fields/buttons that required pop-up keypads were not functional....Now I know.

    Regards,

    Dave

  5. Pop-Up Keypads not Popping Up

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Hi. I am using a V570-57-t20, with a v200-18-e1b snap in I/O and a few additional I/O modules connected via EX-A2X. I have the program installed and running on the first of three installations. I have downloaded the same program to two different V570's that I have on my desk. With the two V570's that are not installed, any button that should trigger a keypad pop-up, just makes the screen flicker briefly, but no other change. Any ideas why? I have tried connecting all the physical i/o modules to match the hardware configuration in the program. I have tried removing a modbus config. function and "com init" function for com port 2( my thinking was that maybe it was hungup trying to establish communications from an empty port) Neither fixed the problem. I tried accessing the info screen, but when the keypad pops up for the password, the screen reacts as if the keypad screen is not actually there(underlying buttons get activated upon touch). Everything else seems to function normally.

    I then downloaded an unrelated application to one of the desk top V570's, all pop-up keypads seem to be working fine, which leads me to believe the problem is with my application. Don't understand why it would work on the installed V570, but not on the desk top one???? Could there be a system bit or integer that I have inadvertently altered?

    I'll keep looking, but any thoughts would be greatly appreciated.

    Dave

  7. ModBus Port Connections

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Thanks Joe.

    That configuration worked fine for a single drive. I should have mentioned that I am connecting two drives, and have initialized the comm port to RS485, 115200 baud rate, 8 data bits, odd parity, 1 stop bit. I came across a similar application using some other plc and copied their connections as shown below.

    PLC -----Servo

    1-------3 & 5

    3 & 5

    6-------4 & 6

    4 & 6

    This seems to work with both drives, but only as fast as 57,600. When I try 115,200 it is hit and miss...mostly miss. This is only a bench test, with short cables(1/2m). I have only tried reading from the drives. I will try writing to them and see how that goes. I wonder if I should have the servo pin 1 connected to the PLC pin 2?

    dave

  9. ModBus Port Connections

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    I need to connect a V570 to a servo drive with Modbus. Both have six pins. The port pin designations are shown below. Can someone please tell me which pins connect to which.

    V570

    1. A signal (+)

    2. (RS232 signal)

    3. (RS232 signal)

    4. (RS232 signal)

    5. (RS232 signal)

    6. B signal (-)

    Servo Drive

    1: GND (0V)

    2: RS-232 TX

    3: RS-422 RX+

    4: RS-232 RX, RS-422 RX-

    5: RS-422 TX+

    6: RS-422 TX-

    Thanks,

    Dave

  12. Toolbar Buttons

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Is there any way to customize the VisiLogic toolbars?...This is a feature that I regularly use in many different programs and find myself almost expecting it to be available. I realize that it is a free software, but I would love to be able to place a few of my favorite FB's on toolbars, instead of mousing through a couple of levels of menu drop downs (which also clutter up my ladder editor window).

    Or even "hot Keys". I saw, in the project properties menu, a dialog box where I could configure up to four hot keys, from a drop list of common instructions. Could that drop down list somehow be expanded to include all the available instruction set, including FB's?

    Or possibly be able to dock any particular drop down menu from the "Ladder Standard" toolbar, as it's own toolbar....

    Dave

  13. V570 Modbus

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    I was wondering if anybody has some sample ladder logic for reading/writing data to two servo drives ( specifically SureServo model SVA-2100) using a V570 OPLC. The PLC will be the master and both drives will be slaves. I will be using discrete I/O to initiate moves and the Modbus will be used to preset various parameters( speed, position, accel/decel, etc.) I have not used Modbus before and would also appreciate any tips and recommendations regarding program structure and Modbus FB's.

    Thanks.

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