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Does anyone have any experience working with the Taylor 484 Online software (DOS based, circa 1980's), and connecting to a Modicon 484 through the J470 converter? The 484 uses a proprietary non-RS232 serial protocol, which the J470 converts to RS232.
The problem that we are experiencing is this: We connect to a running PLC and attempt to view the logic rungs online. Communication times out and then attempts a retry, which also times out. At this point the software allows you to retry, or quit. All attempted retries fail. When you
finally tell it to quit, it shows the first rung on the screen and has "0001/????" at the top of the screen. The software then shows an error
message "Incorrect Address Boundary" and the program locks up, requiring the computer to be powered off.
If the PLC is stopped, you can view the logic in the PLC without any timeouts. Starting the PLC and viewing the logic online is possible if you
have first stopped the PLC and looked at the logic online. It is also possible to upload and download the program if the PLC is stopped.
The processor model is a 484 Model 6 Enhanced, and there is one rack of expansion I/O.
We have run the Taylor software on a Pentium II Laptop, a 486 33Mhz, as well as an original IBM-XT, just to rule out CPU clock speed as a potential problem. Has anyone seen this, or have any suggestions? Modicon Technical Support has not been able to offer any solutions past the possible CPU clock speed being too fast for the Taylor software that expects to be running on an Intel 286.
Brian Peck
Engineer
Northeast Utilities
The problem that we are experiencing is this: We connect to a running PLC and attempt to view the logic rungs online. Communication times out and then attempts a retry, which also times out. At this point the software allows you to retry, or quit. All attempted retries fail. When you
finally tell it to quit, it shows the first rung on the screen and has "0001/????" at the top of the screen. The software then shows an error
message "Incorrect Address Boundary" and the program locks up, requiring the computer to be powered off.
If the PLC is stopped, you can view the logic in the PLC without any timeouts. Starting the PLC and viewing the logic online is possible if you
have first stopped the PLC and looked at the logic online. It is also possible to upload and download the program if the PLC is stopped.
The processor model is a 484 Model 6 Enhanced, and there is one rack of expansion I/O.
We have run the Taylor software on a Pentium II Laptop, a 486 33Mhz, as well as an original IBM-XT, just to rule out CPU clock speed as a potential problem. Has anyone seen this, or have any suggestions? Modicon Technical Support has not been able to offer any solutions past the possible CPU clock speed being too fast for the Taylor software that expects to be running on an Intel 286.
Brian Peck
Engineer
Northeast Utilities