Connection Of Thermocouples With Compensation Box To An Isolated Ai - Siemens SIMATIC S7-300 Reference Manual
Programmable logic controllers module data
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- Manual (676 pages) ,
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Analog Modules
Connecting thermocouples with compensating box
If all thermocouples connected to the inputs of the module have the same
comparison point, you compensate as follows:
Thermo-
couples
Compensating
leads (same
material as
thermocouple)
Figure 4-24
Connection of Thermocouples with Compensation Box to an Isolated AI
Note
Use compensating boxes with a reference junction temperature of 0_C 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.
4-62
Copper
L+
wire
M
L+
M
Comp.
Box
Ref. junction
M+
M–
ADC
M+
M–
COMP
+
COMP
/M
–
ANA
Programmable Logic Controllers S7-300 Module Data
Backplane
bus
A5E00105505-03
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