Siemens SIMATIC NET Guia do Utilizador descarregar pdf (Página 57)

Troubleshooting I/O Server Communication Problems 53

8 Also, if you are using an AT type computer, two devices cannot share

interrupts. Verify that the communication port you are using has a unique

interrupt setting.

2. On Windows 3.1 or Windows for Workgroups, start the Terminal program. On

Windows 95 or Windows NT, start the HyperTerminal program.

3. Configure the Terminal (or HyperTerminal) program to use the same

communication port with the same settings (baud rate, parity, stop bits and so on) as

the hardware device.

4. Connect a null modem cable to a second computer's port.

5. On the second computer, start and configure the Terminal (or HyperTerminal)

program with the same settings as the first computer.

6. Verify that you can send data between the two computers.

8 If you do not have two computers and the computer you are using has another

port, start two instances of the Terminal (or HyperTerminal) program with each

configured to their own port. Then try communicating between them.

8 If you have an external modem, connect the modem to the communication port

that you are testing to see if you can dial out.

7. If the communication port does not appear to be functioning properly, check your

environment files (AUTOEXE.BAT, CONFIG.SYS, SYSTEM.INI, and

WIN.INI). Look for suspicious programs or drivers that might be taking control of

the port or its interrupt before the server is loaded. Always keep your environment

files as clean as possible. If you are in doubt about an entry, comment it out.

8. If the previous step was unsuccessful, try another communication port or another

computer.

Note A common misconception of connecting to a PLC with a DOS program and the

same communication port will work in Windows is not the case! Windows is an entirely

different environment than DOS.

Ø What type of UART is on the COM port?

If it’s not a 16550, then you must lower your baud rate to 9600 or slower. Only the

16550 UART can sustain continuous, error free communications at speeds higher than

9600 baud. Other UARTs may work at speeds faster than 9600 baud, but errors may be

written to the Wonderware Logger. For example, "Receive Overruns." To determine

which UART you have, enter MSD at a DOS prompt, then choose COM Ports from the

MSD menu.

Ø If you are running Windows for Workgroups, verify the following:

1. Add these lines to the [386Enh] section of your SYSTEM.INI file which is located

in your \Windows directory:

EMMEXCLUDE=A000-EFFF

COMxFIFO=0

where x specifies the COM port number. You need to add a separate COMxFIFO

line for each serial port using a 16550 UART chip.

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