Application and functions
1.8 Configuration limits and performance data
CP 154xSP-1
26
Operating Instructions, 12/2019, C79000-G8976-C426-05
●
Frame memory (send buffer)
The CP has a frame memory (send buffer) for the values of data points configured as an
event.
The volume of the send buffer is divided equally among all configured communications
partners. The size of the send buffer can be configured in STEP 7 ("Communication with
the CPU" parameter group).
The maximum size of the send buffer with the respective remote control protocol is:
–
TeleControl Basic
64000 events
–
SINAUT ST7
32000 events
–
DNP3
100000 events
–
IEC 60870-5-104
100000 events
For details of how the send buffer works such as storing events as well as the options for
transferring the data, see /10/ (Page 115).
●
Data points
The data to be transferred by the CP is assigned to various data points in the STEP 7
configuration. The size of the user data per data point depends on the data type of the
relevant data point. For details, see /10/ (Page 115).
–
Telecontrol Basic: 500
–
ST7: 1500
–
DNP3: 1500
–
IEC: 1500