Siemens SIMATIC S7-300 Module data Reference Manual

Analog Modules
4-137
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Special characteristic of parameter assignment to upper and lower limit values
The programmable limit values (triggers for hardware interrupt) differ for the AI 8
RTD from the range of values shown in Table 4-68.
The reason for this is that numerical methods in the module software for evaluating
the process variables prevent values up to 32511 from being reported in some
cases. The process input value at which a hardware interrupt for an underflow or
overflow occurs depends on the calibration factors for an individual channel and
can vary between the lower limits shown in the table below and 32511 (7EFF
H
).
Limit values should not be set at values higher than the minimum potential limit
values shown in the table below.
End-of-scan-cycle interrupt
By enabling the end-of-scan-cycle interrupt, you can synchronize a process with
the conversion cycle of the module. The interrupt occurs when the conversion of all
the enabled channels is complete.
Table 4-72 Content of the 4 bytes with additional information from OB40 during a hardware
interrupt or an end-of-scan-cycle interrupt
Content of the 4 bytes with
additional information
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
Byte
Special
analog
2 bits per channel to identify the range
analog
markers
Upper limit exceeded in
channel
7 6 5 4 3 2 1 0 0
Lower limit exceeded in
channel
7 6 5 4 3 2 1 0 1
End-of-scan-cycle event X 2
Unassigned bit 3

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)