Detailed description
2.5 Linking PLC CPUs to 810D, 840D
Power Line Basic PLC Program (P3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
2-27
2.5.3 Diagnostic buffer on PLC
General
The diagnostic buffer on the PLC, which can be read out using STEP 7, displays diagnostic
information about the PLC operating system. In addition, 10 entries are made to the
diagnostic buffer via the FC by means of the basic program and the "Alarms/Messages"
function. These alarms and messages are indicated in the diagnostic buffer as an event with
"Event ID: <ID>" without any explanatory text.
Meaning of displayed data
An example is presented below to illustrate what information is displayed for an event and
how to interpret this information.
Diagnostic buffer (extract, relevant data selected):
Event details: 1 of 10 Event ID: 16# B046
No entry in text database. Hex values are displayed.
Event ID: 16# B046
OB: 16# 01
PK: 16# 01
DatID 1/ 2: 16# 59 C9
Supplementary info1 / 2 / 3: 16# 0200 0000 0020
Outgoing event: 36:02:459 08.04.03
Type of event
The two most significant digits of Event ID 16# B046 contain the code for the event type:
A1: Alarm set
A0: Alarm cancelled
B1: Message set
B0: Message cancelled
Alarm/Message Number
The two least significant digits of Event ID 16# B046 contain the code for the most significant
decimal places of the alarm or message number. The two least significant digits of
supplementary information 1 / 2 / 3 must also be taken into account when determining the
complete alarm or message number:
• Supplementary information 1 16# 0200 0000 0020
• Supplementary information 2 16# 0200 0000 0020
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