Siemens CPU 315-2 DP Reference Manual

Cycle and Reaction times
3-4
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
Shortest Response Time
Figure 3-2 shows you the conditions under which the shortest response time is
reached.
Operating
system
User
program
PII
The status of the observed input changes
immediately before reading in the PII. The
change in the input signal is therefore taken
account of in the PII.
PIO
The change in the input signal is processed
by the user program here.
The response of the user program to the
input signal change is passed on to the
outputs here.
Response Time
Delay of the inputs
Delay of the outputs
Figure 3-2 Shortest Response Time
Calculation
The (shortest) response time consists of the following:
 1  Process image transfer time of the inputs +
 1 operating system execution time +
 1  Program execution time +
 1 Process image transfer time of outputs +
 Execution time of S7 timer
 Delay of the inputs and outputs
This corresponds to the sum of the cycle time and the delay of the inputs and
outputs.

Siemens CPU 315-2 DP Specifications

General

Memory	64 KB
Power Supply	24 V DC
Order Number	6ES7 315-2AG10-0AB0
Number of DP Masters	1
Number of DP Slaves	124
Load Memory	64 KB
Number of Timers	256
Number of Counters	256
Data Memory	64 KB
Operating Temperature	0 to 60 °C
Integrated Interfaces	MPI, DP
Digital Outputs	Not integrated
Analog Inputs	Not integrated
Analog Outputs	Not integrated
Programming Languages	LAD, FBD, STL
Digital Inputs	Not integrated
Weight	660 g