Communication With The Cpu - Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual

● Report partner status
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
– Bit 1 is set to 1 if all the paths to the remote partner are OK (useful with redundant
– Bit 2 indicates the status of the send buffer (frame memory).
Bits 3 to 15 of the PLC tags are not used and do not need to be evaluated in the program.
4.11

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.
● Cycle pause time
Wait time between two scan cycles of the CPU memory area
● Max. number of write jobs
Maximum number of write jobs to the CPU memory area within a CPU scan cycle
● Max. number of read jobs
Maximum number of low-priority read jobs from the CPU memory area within a CPU scan
cycle.
CP 1243-8 IRC
Operating Instructions, 02/2018, C79000-G8976-C385-03
reached.
paths).
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.
Configuration
4.11 Communication with the CPU
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