Rtd And Thermocouple Modules - Siemens SIMATIC S7-1200 Manual

Table A- 46 Analog output representation for current (CPU 1215C and CPU 1217C)
System
Decimal Hexadecimal
32767 7FFF
32512 7F00
32511 7EFF
27649 6C01
27648 6C00
20736 5100
34 22
0 0
Negative values
In an overflow condition, analog outputs will behave according to the device configuration properties settings. In the
1
"Reaction to CPU STOP" parameter, select either: "Use substitute value" or "Keep last value".
A.8

RTD and Thermocouple modules

The thermocouple (TC) modules (SB 1231 TC and SM 1231 TC) measure the value of
voltage connected to the analog inputs. This value can be either temperature from a TC or
volts.
● If voltage, the nominal range full scale value will be decimal 27648.
● If temperature, the value will be reported in degrees multiplied by ten (for example, 25.3
The RTD modules (SB 1231 RTD and SM 1231 RTD) measure the value of resistance
connected to the analog inputs. This value can be either temperature or resistance.
● If resistance, the nominal range full scale value will be decimal 27648.
● If temperature, the value will be reported in degrees multiplied by ten (for example, 25.3
The RTD modules support measurements with 2-wire, 3-wire and 4-wire connections to the
sensor resistor.
Note
The RTD and TC modules report 32767 on any activated channel with no sensor connected.
If open wire detection is also enabled, the module flashes the appropriate red LEDs.
Best accuracy will be achieved for the 10 Ω RTD ranges if 4 wire connections are used.
The resistance of the connection wires in 2 wire mode will cause an error in the sensor
reading, and therefore accuracy is not guaranteed.
Easy Book
Manual, 03/2014, A5E02486774-AF
Current output range
0 mA to 20 mA
See note 1
See note 1
23.52 mA
20 mA
15 mA
12 mV
0 mA
Negative values are not
supported
degrees will be reported as decimal 253).
degrees will be reported as decimal 253).
A.8 RTD and Thermocouple modules
Overflow
Overshoot range
Rated range
Technical specifications
317