Siemens SIMATIC S7-300 Module data Technical Data Manual

Cycle and reaction times
5.6 Sample calculations
CPU 31xC and CPU 31x, Technical Data
5-22 Manual, 01/2006 Edition, A5E00105475-06
5.5.2 Reproducibility of Time-Delay and Watchdog Interrupts
Definition of "Reproducibility"
Delay interrupt:
The period that expires between the call of the first instruction in the interrupt OB and the
programmed time of interrupt.
Watchdog interrupt:
The fluctuation width of the interval between two successive calls, measured between the
respective initial instructions of the interrupt OBs.
Reproducibility
The following times apply for the CPUs described in this manual, with the exception of
CPU 319
• Delay interrupt: +/- 200 μs
• Watchdog interrupt: +/- 200 μs
The following times apply in the case of CPU 319:
• Delay interrupt: +/- 140 μs
• Watchdog interrupt: +/- 88 μs
These times only apply if the interrupt can actually be executed at this time and if not
interrupted, for example, by higher-priority interrupts or queued interrupts of equal priority.
5.6 5.6 Sample calculations
5.6.1 Example of cycle time calculation
Design
You have configured an S7300 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.

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)