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Siemens Simatic S7-400 User Manual

Page 273

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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

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