AXL E PB DIO16 M12 6P

8437_en_03

17

PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany

phoenixcontact.com

14

Sync/freeze mode

The device supports sync and freeze mode.

The functions must be activated by the PROFIBUS master

in the parameter data.

Input and output data is written or read at defined times with

the sync and freeze commands.

If the device receives a sync command from the PROFIBUS

master at any given time, the current OUT process data is

transferred and frozen until the next sync command.

Similarly, the states of the inputs are transferred on the re-

spective freeze command and are frozen until the next

freeze command.

15

Diagnostic alarms

PROFIBUS enables the PROFIBUS device to store diag-

nostic information together with the error location and error

type.

In the default upon delivery the alarms are enabled, how-

ever, they can be disabled with parameters on startup.

An incoming alarm informs the PROFIBUS device that diag-

nostic information has been entered.

When the diagnostic information has been removed, an out-

going alarm is sent to the device.

If at least one piece of diagnostic information is stored, the

SF LED is on. If no diagnostic information is present, the

SF LED is off.

The following PROFIBUS diagnostic messages are indi-

cated by the PROFIBUS device:

–

Overtemperature of the device

–Surge voltage of U

S

–

Overload of U

S

–

Short circuit of an output

–Output overload

16

Monitoring

A process data watchdog is integrated into the device to

avoid uncontrolled setting/resetting of outputs in the event of

an error.

If device outputs are set, the controlling process must be

able to access the device.

In the event of an error, e.g., bus cable interrupted or func-

tion error in the controlling process, the device can respond

appropriately via the process data watchdog.

When activating the process data watchdog, it is started by

the first write process and the next write process is expected

within the timeout period. During error-free operation, the

write process is performed during the timeout period and the

watchdog is restarted (triggered).

If there is no triggering during the timeout period, an error oc-

curred. Two responses follow:

–

All outputs are set to the configured substitute value.

–

The BF LED indicates the corresponding state.

17

Substitute value behavior

If PROFIBUS communication fails or if no valid process data

is received from the PROFIBUS master, all device outputs

are set to the parameterized substitute values.

Reading calls do not trigger the process data

watchdog.