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Thin Web Server

Possible Problem Corrupted TWS configuration file.

Possible Cause – TSSP & TWS program version mismatch.

Modbus master cannot communicate with TWS.

– TWS is not serially connected properly to the Modbus master. – TSSP was not configured for serial Modbus communication. – Incorrect serial cable adapter used for this application. – Incorrect registers used by the Modbus master.

Symptom

  • 13.

    Server setup program cannot upload / download configuration. Receiving an error message after upload / download.

  • 14.

    Serial Modbus communication is not working properly.

  • Make sure to use the correct serial adapter to connect the Modbus master to the TWS.

  • Only COM2 can be used for serial Modbus communication.

  • Make sure to enable and set up serial communication to the TWS properly.

  • Make sure to use only the register maps for TWS serial Modbus communication.

Same as item 4

Action

15. TCP/IP open Modbus communication is not working properly.

Modbus master cannot communicate with TWS.

  • TWS was not configured for TCP/IP Modbus communication.

  • Incorrect registers and addressing scheme used by the Modbus master.

  • Make sure to enable and set up TCP/IP Modbus communication to the TWS properly through TSSP.

  • Make sure to use only the register maps for TWS TCP/IP Open Modbus communication.

  • TCP/IP Modbus communication of the TWS only renders data from serial devices connected to its COM3 & COM4 ports. TWS does not render data from remote 72Es.

16. Needed to reset alarm logs.

  • Run your server setup program again, connect to the TWS. Go to Utilities, Server File Management and delete the file C:\alarm.bin. Refer to page 5-1.

Troubleshooting

Prevention Same as item 4

  • Follow this Installation Manual for how to connect and implement Modbus communication in the TWS.

  • Only use TWS Modbus communicaton register maps in designing GUI applicaton that will communicate to ASCO device through the TWS.

  • Follow this Installation Manual for how to install the TWS and use the TSSP.

  • Only use TWS Modbus communication register maps in designing GUI application that will communicate to ASCO device throught the TWS.

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