Detailed description
2.6 Interface structure
Basic logic functions: PLC Basic program powerline (P3 pl)
44 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
– Evaluation 2;Acquisition of
– Error messages
A fixed specification exists to define which signals in a group generate an error
message when they change from "0" to "1".
– Evaluation 3;Acquisition of
– Operational messages
A fixed specification exists to define which signals in a group generate an operational
message.
• The scope of the user bit fields (user area) is defined as standard as 10 areas with 8
bytes each, but can also be adjusted to suit the requirements of the machine
manufacturer via basic program parameters in FB1.
Acknowledgement concept
The following acknowledgment procedures are implemented for error and operational
messages:
Operating messages are intended for the display of normal operating states as information
for the user. Acknowledgment signals are, therefore, not required for this type of message.
An entry is made in the diagnostic buffer for incoming and outgoing messages. The HMI
software maintains an uptodate log of existing operating messages using the identifiers
"operating message arrived" and "operating message gone".
Error messages are used to display error states on the machine which generally lead to a
machine stoppage. Where several errors occur in rapid succession, it is important to be able
to distinguish their order of occurrence for troubleshooting purposes. This is indicated, on the
one hand, by the order in which they are entered in the diagnostic buffer and on the other, by
the time stamp, which is assigned to every entry.
If the cause of the error disappears, the error message is only deleted if the user has
acknowledged the message (e.g., by pressing a key on the machine control panel). In
response to this signal, the "message acquisition" FC examines which of the reported errors
have disappeared and enters these in the diagnostic buffer with the entry "error departed".
This enables the HMI software to also maintain an uptodate log of existing error messages.
The time of day indicating the time at which the error occurred is maintained for messages,
which are still pending (in contrast to a received interrogation).
To Next Page
Loading...
Need help?
General
