Siemens SIMATIC S7-300 Module data Reference Manual

Digital Modules
3-33
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Hardware interrupt lost
In an interrupt has been buffered for a channel and another interrupt occurs on that
channel before it has been processed by the CPU, a diagnostic interrupt “hardware
interrupt lost” is triggered.
More interrupts on this channel are not acquired until processing of the interrupt
buffered on this channel has been executed.
Interrupt-triggering channels
The channel triggered by the hardware interrupt is entered in the start information
of the OB 40 in the OB40_POINT_ADDR variable. Figure 3-9 shows the
assignment of the bits to the local data double word 8.
Byte Variable Data type Description
6/7 OB40_MDL_ADDR WORD B#16#0 Address of the interrupt
triggering module
From
8
OB40_POINT_ADDR DWORD See
Figure 3-9
Display of the interrupt
triggering inputs
1
Bit no.
3130
29 28 2726
LD 8
1
LB 8
25 24
Edge change channel 2
Edge change: Channel 0
Edge change: Channel 7
LB 11
0
1
Edge change: Channel 1
11
LB 10
1
2322
21 20 1918
1
LB 9
17 16
11
Edge change channel 10
Edge change: Channel 8
Edge change: Channel 15
Edge change: Channel 9
reserved
Figure 3-9 Start Information of OB 40: Which Event Has Triggered the Hardware Interrupt at the Limit
Value

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)