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216 Siemens Simatic S7 Driver Online Help

The Most Common I/O Driver Problems

Some of the most common problems people encounter when setting up and using I/O

drivers result from one or more of the following:

• Using incorrect or faulty cable connections. To verify your connections, refer

to the cable diagram in your hardware documentation. Another test that

usually verifies the cable’s wiring is correct is to attempt to communicate to

the hardware with the programming software through the same cable.

• Specifying an incorrect communication processor, virtual field device, or

connection name for the process hardware in your driver configuration.

Review the driver configuration and your process hardware.

• Failing to run SAC. You cannot access data from your I/O driver in a picture

or operator display until SAC is running.

• Setting the write protect switch on the hardware. If the I/O driver reads values

but does not write values, make sure the switch is not set. Also, start the

Power Tool and verify that the Disable Output and Enable Block Writes

options are not enabled for the datablock.

• Attempting to communicate to areas of memory not defined in the controller.

Verify that each datablock’s address is valid.

See Also

Getting Technical Support | Checking Communication

Tools for Troubleshooting the SI7 I/O Driver

The Statistics View in the SI7 I/O Driver Power Tool

The Power Tool displays communication statistics for each datablock, device,

channel, and the entire driver. Displaying these statistics is useful for narrowing

down which part of the driver is not functioning. To view the statistics, select a

datablock, device, or channel from the Tree Browser and select Stats Mode from the

Display Mode menu.

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Siemens SIMATIC NET Spécifications Page 226