Siemens SIMATIC S7 System Manual page 754

Technical specifications
A.5 Thermocouple and RTD expansion modules (EMs)
The EM AT04 Thermocouple (TC) analog expansion module measures the value of voltage
connected to the module inputs. The temperature measurement type can be either
"Thermocouple" or "Voltage".
● "Thermocouple": The value will be reported in degrees multiplied by ten (for example, 25.3
degrees will be reported as decimal 253).
● "Voltage": The nominal range full scale value will be decimal 27648.
Table A- 119 Wiring diagram for the EM AT04 Thermocouple 4 x 16 bit (6ES7288-3AT04-0AA0)
EM AT04 4 x 16 bit
(6ES7288-3AT04-0AA0)
Note: Connectors must be gold. See Appendix F, Spare Parts and other hardware for article number.
①
TC 2, 3, 4, and 5 not shown connected for clarity.
Table A- 120 Connector pin locations for EM AT04 4 x 16 bit (6ES7288-3AT04-0AA0)
Pin
754
X10 (gold)
1 L+ / 24 V DC
2 M / 24 V DC
3 Functional Earth
4 AI 0+ /TC
5 AI 0- /TC
6 AI 1+ /TC
7 AI 1- /TC
X11 (gold)
No connection
No connection
No connection
AI 2+ /TC
AI 2- /TC
AI 3+ /TC
AI 3- /TC
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART