Siemens SIMATIC NET TeleControl S7-1200 CP 1243-1 Operating Instructions Manual page 46

Configuration
4.7 Partner stations
Slot
Here, enter the slot number of the CP in the partner station via which the connection will be
established.
Frame memory
Activate the option for enabling inter-station communication.
The frames are stored in the send buffer (frame memory) of the CP if the connection is
disturbed. Note that the capacity of the frame memory is shared by all communications
partners.
Access ID
The access ID displayed here is formed from the hexadecimal values of project number,
station number and slot. The parameter of the type DWORD is allocated as follows:
● Bits 0 - 7: Slot
● Bits 8 - 20: Station number
● Bits 21 - 31: Project number
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 74).
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.
● Frame memory size
Here, you set the size of the frame memory for events (send buffer).
The size of the frame memory is divided equally among all configured communications
partners. You will find the size of the frame memory in the section Configuration limits
and performance data (Page 15).
You will find details of how the send buffer works (storing and sending events) as well as
the options for transferring data in the section Process image, type of transmission, event
classes, triggers (Page 75).
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Operating Instructions, 12/2016, C79000-G8976-C365-02
CP 1243-1