Profibus Indicators; Profibus-Specific Errors; Profibus Watch Dog Timer; Profibus-Specific Debug Menu - Advanced Energy MDX II User Manual

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Advanced Energy
Table 7-10. AE Bus Command-Status Response (CSR) Codes (Continued)
Value Meaning
19 Recipe is active
99 Command not accepted because no such command exists

Profibus Indicators

PROFIBUS-SPECIFIC ERRORS

In the event of a Profibus error, the unit turns output power off and displays the appropriate
error message (see page 8-10). All Profibus errors are treated as "explicit clear" type faults;
thus, you must send Command 119 (the "master reset" command) in the next download packet
to clear them. Once all faults have been cleared, the unit is ready to continue operation.
We recommend sending this command upon the startup of Profibus communications so that
any existing fault indications will be cleared.

PROFIBUS WATCH DOG TIMER

As a safety feature, the Profibus maintains a watch dog timer that shuts off the supply's output
if the Profibus master stops communicating. The watch dog timer maintains a value for time
(between 10 ms and 10 minutes) that the supply waits between commands from the master.
The timer counts down this time in 10 ms increments.
If your Profibus system does not calculate the watch dog timer value for you or if you want to
modify the existing watch dog timer value, then you may enter a timer value by using the
Profibus Set_Prm function call (see DIN 19245 Profibus Standard Part III). To get the actual
wait time value, the microprocessor uses the numbers you enter to octet 2 and 3 of the
Set_Prm, multiplies them together, and then multiplies the result by 10 ms. Therefore, when
using the Set_Prm function call, calculate the numbers for octet 2 and 3 accordingly.
Remember, the values for octet 2 and 3 must not be equal or be zero.
Note: You can disable the watch dog timer via the Profibus master.

PROFIBUS-SPECIFIC DEBUG MENU

Units that feature the AE Profibus and also an active front panel or an active remote panel can
display a Profibus debug screen. This screen is essentially a memory dump of the last
download and upload bytes present in the Profibus interface. Also, this screen displays the
configuration and the address of the unit. To access this screen, use the following softkeys:
⇒
MORE Service
Note: This screen is to assist in development work during which the Profibus master is
"stepping through" commands. Because the active remote panel communicates at a
slower rate than does the Profibus, you may see this screen lock up if you are sending
Profibus commands in "real time."
7-58
⇒
Debug
Serial Port Connection, Controls and Indicators
⇒
Profi
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