Siemens Simatic S7-400 - Manual (Page 273)

Analog Modules
5-57
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
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.
Table 5-45 Ordering Data of the Comparison Point
Recommended Compensating Box Order Number
Reference junction with integrated power supply
unit, for rail mounting
Auxiliary power 220 VAC
110 VAC
24 VAC
24 VDC
Connection to thermocouple Fe-CuNi Type L
Fe/Cu Ni Type J
Ni Cr/Ni Type K
Pt 10% Rh/Pt Type S
Pt 13% Rh/Pt Type R
Cu-CuNi Type U
Cu/Cu Ni Type T
Reference temperature 0 _ C
M72166 -
VVVVV
B
1
B
2
B
3
B
4 1
2
3
4
5
6
7
0
0
Connecting to the Comparison Point (Order No. M72166-xxx00)
Output
(Cu wires)
M
+
M
–
M
+
M
–
Compensating leads (same
material as thermocouple)
+
–
–
+
–
Auxiliary power
+
Figure 5-19 Connection of a Thermocouple with Reference Junction (Order No. M72166-xxx00) to an
Isolated AI