Configuration
4.8 Partner stations
CP 1243-1
60 Operating Instructions, 04/2017, C79000-G8976-C365-03
The CP supports the following implementation levels:
– Level 1
– Level 2
– Level 3
– Level 4
– Level 4+
The implementation level known here as Level 4+ that is not specified in the standard
contains the range of functions of Level 4 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
●
Mode with which DNP events are transferred to this communications partner:
– Chronological transfer of individual frames
or
– Transfer of collected frames per data point as a block.
●
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.
Communication with the CPU
Using the first three parameters you specify the CPU access by the CP in the CPU scan
cycle. You will find the structure of the CPU scan cycle in the section Read cycle (Page 96).
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