Siemens SIMATIC Distributed I/O ET 200eco PN Operating Instructions Manual page 171

I/O device analog input/analog output
10.1 I/O device analog input
frequency suppression "Off (Fast Mode)" means 500 Hz, which corresponds to an integration
time of 2 ms for a measurement channel.
Temperature unit
This parameter is used to select the unit in which the temperature is detected.
Reference temperature for TC
The reference temperature applies to all channels at which "Fix Ref. Temp." was selected at
"Reference junction". Information about the value range of the reference temperature is
available in the table Reference temperature for TC (Page 186-187).
Measurement type (channel-wise)
Click the field to have the available measurement types displayed and select them.
Possible measurement types:
• Voltage ±80 mV
• Resistor (4-wire connection)
• Resistor (3-wire connection)
• Resistor (2-wire connection)
• Thermal resistor (linear, 4-wire connection)
• Thermal resistor (linear, 3-wire connection)
• Thermal resistor (linear, 2-wire connection)
• Thermocouple
This parameter is used to set the measuring method, for example voltage. For any unused
channels, you must select the disabled setting. For a disabled channel, the conversion time
and integration time of the channel = 0 s, and the overall cycle time of the device is reduced.
Measuring range
With this parameter, you set the measuring range of the selected measurement type.
Temperature coefficient (for RTD, thermoresistor)
The correction factor for the temperature coefficient (α-value) specifies the extent to which
the resistance of a certain material changes when the temperature is raised by 1 °C.
The α-values conform to EN 60751, GOST 6651, JIS C 1604, and ASTM E-1137.
The temperature coefficient depends on the chemical composition of the material.
172
Operating Instructions, 06/2022, A5E01250250-AN
ET 200eco PN