Configuration and operation
5.8 Notes on configuring individual functions
CP 1243-1 DNP3, CP 1243-1 IEC
Operating Instructions, 02/2014, C79000-G8976-C312-02
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If the "Report partner status" function is enabled, the CP signals the status of the
communication to the remote partner.
– Bit 0 of "PLC tag for partner status" (data type WORD) is set to 1 if the partner can be
reached.
– Bit 1 is set to 1 if all the paths to the remote partner are OK (useful with redundant
paths).
– Bit 2 indicates the status of the send buffer (frame memory).
The following values are possible:
- 0: send buffer OK
- 1: send buffer threatening to overflow (more than 80 % full).
- 3: send buffer has overflowed (fill level 100 % reached).
As soon as the fill level drops below 50%, bit 3 is reset to 0.
Bits 3 to 15 of the PLC tags are not used and do not need to be evaluated in the program.
Partner stations > Partner 'X' > "Advanced settings" > DNP3 level (DNP3 only)
Various levels of protocol conformity are defined in the DNP3 protocol and they describe the
supported range of functions (subset) of a master or a station. These levels (implementation
levels) are known as "DNP3 Application Layer protocol Level" and abbreviated with
DNP3-L1 to DNP3-L4.
The selection of the level used by the DNP3 CP which must correspond to that of the
connected master is set separately in STEP 7 for each individual communications partner
(DNP3 master).
The CP supports the following implementation levels:
● DNP3-L1
● DNP3-L2
● DNP3-L3
● DNP3-L4
● DNP3-L5
The implementation level known here as DNP3L5 that is not specified in the standard
contains the range of functions of DNP3L4 and in addition support of the following DNP3
data types / variations:
– 64-bit analog value as floating-point number without time of day
– 64-bit analog value as floating-point number with time of day
– Counter event with time of day in 16-bit format
– Counter event with time of day in 32-bit format
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