Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP User Manual

Memory concept
6.6 Memory of the integrated technology of the CPU
Calculation example
The table shows the memory utilization for a sample configuration with a CPU 315T-2 DP
with hardware version 02. The maximum memory utilization is 77% and is therefore less
than the recommended maximum memory utilization.
Quantity Description Memory
utilization
Memory utilization
(total)
1 Base load of the integrated technology 25 % 25 %
6 Following axis (with one following object) 2,5 % 15 %
2 External encoder 0,6 % 1,2 %
6 Output cam 0,25 % 1,5 %
2 Measuring input 0,25 % 0,5 %
14 Cam (empty) 0,25 % 3,5 %
6000* Cam interpolation points 0,0046 % 27,6 %
1000** Cam interpolation points to be interpolated 0,0027 % 2,7 %
Total 77 %
* The maximum possible number of cam interpolation points must be taken into account as value in the Technology CPU.
Example:
10 cams each with 300 cam interpolation points
2 cams each with 500 cam interpolation points
2 cams each with 1000 cam interpolation points
This is a total of 6000 cam interpolation points (10x300 + 2x500 + 2x1000).
** Additional memory is used during the interpolation of a cam. As only one cam can be interpolated at one time, in this
case the cam with the largest number of cam interpolation points must be taken into account (this is 1000 cam
interpolation points in the calculation example).
S7-300 CPU Data: CPU 315T-2 DP
Manual, 12/2005, A5E00427933-02
6-19

Siemens SIMATIC S7-300 CPU Data: CPU 315-T-2 DP Specifications

General

Programming Language	STEP 7
Power Supply	24 V DC
Number of DP masters	1
Processable Technology objects	Yes
Number of counters	256
Number of timers	256
S7 communication	Yes
Number of connections for S7 communication, max.	16
PG/OP communication	Yes
Global data communication	Yes
Integrated DP interface	Yes
Integrated PROFINET interface	No
SIMATIC Computing Platform	No
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Communication	PROFIBUS DP
Cycle Time	0.1 ms
Engineering with	STEP 7
Backup available	Yes
Transmission rate, max.	12 Mbit/s