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Network Operation

& Troubleshooting

7–3

Network Operation and Troubleshooting

Troubleshooting

If the network does not seem to be working correctly, check the following items.

1. Cable and connections. Incorrectly wired cables and loose connectors

cause the majority of problems. Verify you’ve selected the proper cable

configuration and check to see the cable is wired correctly.

2. Switch settings. Make sure you’ve set the slave stations to match the

communication parameters required by the master station (DCM, operator

interface or host computer).

3. Incorrect protocol. Make sure your network stations are all set for the same

protocol. DirectNET networks can use the DirectNET or HostLink/CCM2

protocol selections.

4. Communications program. Check the communications program for errors.

Sometimes it is helpful to have an example you can try. AppendicesA,B, andC

provide examples of the three network configurations. You can quickly and easily

build a small network to make sure you are following all the appropriate steps. These

are especially helpful if this is your first DirectNET application.

Most problems that occur with the CPUs are related to communication settings.

Check the switch settings, and/or use a programming device to check the station

address.

DirectNET programs must manage all aspects of network communication including

timing considerations. Chapter 6 provides information on network timing issues that

can affect network performance.

The communications interfaces, DCMs and DCUs, have indicators that are

specifically for communication status. The following paragraphs show these

indicators and describe their meanings.

First Place to Look

Try an Example

Program

CPUs with Built-in

DirectNET Ports

Host Masters

Communication

Interface Indicators

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 206 207

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Siemens SIMATIC TIWAY 1 Especificaciones Pagina 105