Configuration
4.11 Communication with the CPU
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
95
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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.
Communication with the CPU
4.11.1
Communication with the CPU
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 147).
The fourth parameter "Frame memory size" decides the size of the send buffer on the CP for
frames of data points that are configured as an event.
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Wait time between two scan cycles of the CPU memory area
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Max. number of write jobs
Maximum number of write jobs to the CPU memory area within a CPU scan cycle
●
Maximum number of low-priority read jobs from the CPU memory area within a CPU scan
cycle.
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