Siemens SIMATIC S7-300 Module data Technical Data

Cycle and reaction times
5.6 Sample calculations
CPU 31xC and CPU 31x, Technical data
5-24 Manual, Edition 08/2004, A5E00105475-05
5.6 Sample calculations
5.6.1 Example of cycle time calculation
Installation
You have configured an S7300 and equipped it with following modules in rack "0":
• a CPU 314C-2
• 2 digital input modules SM 321; DI 32 x 24 VDC (4 bytes each in the PI)
• 2 digital output modules SM 322; DO 32 x 24 VDC/0.5 A (4 bytes each in the PI)
User program
According to the Instruction List, the user program runtime is 5 ms. There is no active
communication.
Calculating the cycle time
In this example, the cycle time is equivalent to the sum of the following times:
• User program execution time:
approx. 5 ms x CPU-specific factor 1.10 = approx. 5.5 ms
• Process image transfer time
Process image of inputs: 100 μs + 8 Byte x 37 μs = approx. 0.4 ms
Process image of outputs: 100 μs + 8 Byte x 37 μs = approx. 0.4 ms
• Operating system runtime at the scan cycle checkpoint:
approx. 0.5 ms
Cycle time = 5.5 ms + 0.4 ms + 0.4 ms + 0.5 ms = 6.8 ms.
Calculating the physical cycle time
• There is no active communication.
• Interrupts are not processed.
Hence, the physical cycle time is 6 ms.

Siemens SIMATIC S7-300 Module data Specifications

General

Series	S7-300
Manufacturer	Siemens
Protection Class	IP20
System	SIMATIC S7-300
Digital Inputs	Varies by module
Digital Outputs	Varies by module
Analog Inputs	Varies by module
Analog Outputs	Varies by module
Central Processing Unit	Varies by CPU model
Supply Voltage	24V DC or 120/230V AC
CPU Type	Varies (e.g., CPU 312, CPU 315, etc.)
Memory	Varies by CPU model
Communication Interfaces	MPI, PROFIBUS
Programming Languages	LAD, FBD, STL, SCL, GRAPH
Operating Temperature	0°C to 60°C
Storage Temperature	-40°C to 70°C
Relative Humidity	10% to 95% (non-condensing)