Detailed description
2.5 Linking PLC CPUs to 810D, 840D
Basic logic functions: PLC Basic program powerline (P3 pl)
34 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
MCP/PLC interface, HHU/PLC interface (810D only)
Data exchange between MCP/PLC and HHU/PLC takes place via the MPI interface on the
PLC. The Communication with global data (GD)
1)
service is used for this purpose (see also
STEP7 User's Guide). The PLC operating system handles the transfer of signals from and to
the user interface. The STEP7 Communication configuration configuring tool is used to
define both GD parameters as well as operand areas (e.g., I/O) and their initial addresses. In
SW 2.2 and higher, data exchange is possible as on the 840D.
1)
IC (GD) = Implicit Communication (Global Data)
2.5.4 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. Moreover, through the basic program and the
function: "Alarms / messages" are made available via the FC10 entries in the diagnostic
buffer. These alarms and messages are displayed in the diagnostic buffer as event with the
"Event-ID": <ID>" without 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
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