CESAR 1312 (E)
Communication Interfaces
4-53
CESAR™ 1312 Generator
PROFIBUS Master Reset Command
Send the master reset command,
Command 119
, when the CESAR
generator supply has experienced a non-recoverable (“explicit clear”) fault
(that is, a configuration fault or a PROFIBUS error fault). Dressler
recommends sending this command upon the startup of PROFIBUS
communications so that any existing fault indications will be cleared.
PROFIBUS-Specific Errors
In the event of a PROFIBUS error, the CESAR generator turns off output
power and sets the PROFIBUS fault status bit. 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 CESAR generator is ready to continue
operation.
PROFIBUS Data Consistency
Some Programmable Logic Controllers (PLCs) using PROFIBUS interfaces
have a problem with
data consistency
. (Dressler defines data consistency as
the ability to complete the message packet construction before sending the
packet to the CESAR generator.) This problem most often manifests as
mysteriously changed values. That is, values at the CESAR generator seem
to have changed automatically even though no command has executed, or the
values appear changed because one data bye contained the data that another
data byte should have contained.
The root of the problem is a shared memory block. Most PLCs share a
memory block with the
PROFIBUS
interface. The PLC places data/packet
information in the memory block, and the
PROFIBUS
interface reads the
memory block for the next data/packet to transmit. The problem occurs when
the PLC updates the data from High to Low memory locations and does not
signal the
PROFIBUS
interface when the update is complete. (If the PLC were
Red (steady)
Off
The PROFIBUS system is off
or unavailable.
Red (flashing)
Error
The PROFIBUS system is
currently in a stop or clear
condition, exchanging data,
or in an error recovery
sequence. See
Table 4-8. PROFIBUS status LEDs (Continued)
LED
Indication
Unit Status
Содержание CESAR 1312
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