Siemens CP 1243-1 Operating Instructions Manual page 61

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 97).
Watchdog bit
● CP monitoring
Via the watchdog bit the CPU can be informed of the status of the telecontrol
communication of the CP.
CP time of day
● CP time to CPU
Using this function, the CP can make its time of day available to the CPU.
You will find details in the STEP 7 information system.
CP 1243-1
Operating Instructions, 04/2017, C79000-G8976-C365-03
Configuration
4.8 Partner stations
61