Communication With The Cpu - Siemens S7-1200 TELECONTROL Operating Instructions Manual

Access ID
The access ID of the partner CP is displayed here.
The Access ID (DWORD) is formed from the hexadecimal values of project number, station
number and slot:
Bits 0 to 7: Slot
Bits 8 to 20: Station number
Bits 21 to 31: Project number
4.9.5

Communication with the CPU

The parameter group is displayed as soon as telecontrol communication is enabled.
Communication with the CPU
Using the first three parameters you specify settings for the cyclic access of the CP to the
CPU. You will find information on the structure of the scan cycle in the section Read cycle
(Page 69).
● Cycle idle time
Waiting 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 communications partners. You
will find the size of the frame memory in the section Performance data and configuration
limits (Page 13).
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 70).
Watchdog bit
● CP monitoring
Via the watchdog bit the CPU can be informed of the status of the telecontrol
communication of the CP.
CP 1242-7 GPRS V2
Operating Instructions, 10/2016, C79000-G8976-C311-02
Configuration and operation
4.9 STEP 7 configuration
57