Siemens SIMATIC S7-300 Module data Technical Data

Technical data of CPU 31xC
6.6 Technical data of the integrated I/O
CPU 31xC and CPU 31x, Technical data
Manual, Edition 08/2004, A5E00105475-05
6-45
6.6.4 Interrupts
Interrupt inputs
All digital inputs of the on-board I/O of CPUs 31xC can be used as interrupt inputs.
You can specify interrupt behavior for each individual input in your parameter declaration.
Options are:
• no interrupt
• Interrupt at the positive edge
• Interrupt at the negative edge
• Interrupt at the positive and negative edge
Note
Every channel will hold one event if the rate of incoming interrupts exceeds the handling
capacity of OB40. Further events (interrupts) will be lost, without diagnostics or explicit
message.
Start information for OB40
The table below shows the relevant temporary variables (TEMP) of OB40 for the interrupt
inputs of 31xC CPUs. A description of process interrupt OB 40 is found in the Reference
Manual
System and Standard Functions .
Table 6-11 Start information for OB40, relating to the interrupt inputs of the integrated I/O
Byte Variables Data type Description
6/7 OB40_MDL_ADDR WORD B#16#7C Address of the interrupt-
triggering module (here: default
addresses of the digital inputs)
8 on OB40_POINT_ADDR DWORD see the figure
below
Displaying the interrupt-
triggering integrated inputs

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)