Siemens Simatic S7 Series

Technical specifications
A.5 Thermocouple and RTD expansion modules (EMs)
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
627
Model
EM AT04 AI 4 x 16 bit TC
Module update time
See Filter selection table.
Cold junction error ±1.5°C
Cable length (meters)
100 m to sensor max.
Wire resistance 100 Ω max.
Table A- 110 Diagnostics
Model
EM AT04 AI 4 x 16 bit TC
Overflow/underflow
1
Yes
Wire break (current mode only)
2
Yes
24 V DC low voltage
1
Yes
1
The overflow, underflow and low voltage diagnostic alarm information will be reported in the analog data values even if
the alarms are disabled in the module configuration.
2
When wire break alarm is disabled and an open wire condition exists in the sensor wiring, the module may report ran-
dom values.
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.