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Siemens SIMATIC S7-300 Module data Reference Manual

Siemens SIMATIC S7-300 Module data
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Analog Modules
4-62
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
Connecting thermocouples with compensating box
If all thermocouples connected to the inputs of the module have the same
comparison point, you compensate as follows:
M+
M–
M+
M–
Backplane
bus
ADC
M
L+
Compensating
leads (same
material as
thermocouple)
Box
Comp.
Ref. junction
ML+
Copper
wire
COMP
/M
ANA
COMP
+
Thermo-
couples
Logic
Figure 4-24 Connection of Thermocouples with Compensation Box to an Isolated AI
Note
Use compensating boxes with a reference junction temperature of 0C for
analog input modules.
Recommended compensating box
We recommend you to use a comparison point (with integrated power supply unit)
from Siemens as a compensating box. You will find the necessary ordering data in
the table below.

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Siemens SIMATIC S7-300 Module data Specifications

General IconGeneral
SeriesS7-300
ManufacturerSiemens
Protection ClassIP20
SystemSIMATIC S7-300
Digital InputsVaries by module
Digital OutputsVaries by module
Analog InputsVaries by module
Analog OutputsVaries by module
Central Processing UnitVaries by CPU model
Supply Voltage24V DC or 120/230V AC
CPU TypeVaries (e.g., CPU 312, CPU 315, etc.)
MemoryVaries by CPU model
Communication InterfacesMPI, PROFIBUS
Programming LanguagesLAD, FBD, STL, SCL, GRAPH
Operating Temperature0°C to 60°C
Storage Temperature-40°C to 70°C
Relative Humidity10% to 95% (non-condensing)

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