
Analog modules
5.13 Connecting thermocouples
S7-400 Automation System Module Data
234 Reference Manual, Edition 09/2009, A5E00850736-06
Connecting the compensating box
The compensating box is looped in through the leads of each thermocouple. The
compensating box must be supplied on an isolated basis. The power supply module must
provide adequate noise filtering, for example, by means of grounded cable shielding.
Each channel can use a thermocouple type supported by the analog module independently
of the other channels. Each channel requires its own compensating box.
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 reference junction (with integrated power supply unit) from
Siemens as a compensating box. You will find the necessary ordering data in the table
below.
Ordering information for the reference junction
Recommended compensating box Order number
Reference junction with integrated power supply unit, for rail
mounting
Auxiliary power B1
B2
B3
B4
230 VAC
110 VAC
24 VAC
24 VDC
Connection to
thermocouple
1
2
3
4
5
6
7
Fe-CuNi
Fe/Cu Ni
Ni Cr/Ni
Pt 10% Rh/Pt
Pt 13% Rh/Pt
Cu-CuNi
Cu/Cu Ni
Type L
Type J
Type K
Type S
Type R
Type U
Type T
Reference
temperature
00 0° C
M72166
-V V V V V
B1
B2
B3
B4
1
2
3
4
5
6
7
00
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