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Chapter 9. Configuring the I/O Driver with the Power Tool 133

the failed device, it ignores the Retries and only makes one attempt. If the

attempt is successful, the driver recovers all datablocks on the device and

marks them ready for messages.

By using QuickFail, the driver saves time and bypasses the problem device,

thereby increasing its efficiency.

See Also

Adding and Modifying Devices | Feature: QuickFail Logic

Adding and Modifying Datablocks

Datablocks define areas in PLC memory you want the SI7 driver to access.

Example

Reply Timeout = 15 (15 seconds)

Retries = 5

Delay Time = 5:00(5 minutes)

Backup Device = none

Global timeout = 10 (10 seconds)

The driver attempts to send a message to the process hardware. After 15 seconds, the device

still has not responded so the driver re-sends the message.

SIMATIC NET determines it is able to send another message. Consequently, the driver tries

to send the message again. Assuming that it is able to send data for all retries, the driver sends

the request 6 times (the first time and then the 5 retries) with 15-second intervals between each

attempt.

Each attempt fails; consequently, the driver marks the datablock as failed. If the driver has

messages for other datablocks on the same device, it sends them only once without retries.

The driver waits 5 minutes before attempting to re-establish communication with the failed

device.

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