10.4.1.3 Supplemental information on AI 8 x 13-bit
Unused channels
Set the "disabled" value at the "measurement type" parameter for unused channels. This
setting reduces module cycle times.
Interconnect the M- terminals of unused channels.
Using PTC resistors
PTCs are suitable for monitoring the temperature of or providing thermal protection for complex
drives and transformer windings. The module has no analog values when PTC resistances are
used. Status information on fixed temperature ranges are displyed instead of analog values.
● When setting the parameters, select measurement type R "Resistance" and measuring
range "PTC".
● Connect the PTC (see "Terminal diagram for resistance measurement").
● Use PTC resistors that comply with IEC 60034-11-2 (previously, PTC thermistors that
complied with DIN/VDE 0660, Part 302).
● Sensor data for the PTC resistor:
Property Technical specifica‐
tions
Comment
Switching points Response to rising temperature
< 550 Ω Normal range:
Bit 0 = "0", bit 2 = "0" (in the PII)
550 Ω to 1650 Ω Advance warning range:
Bit 0 = "0", bit 2 = "1" (in the PII)
> 1650 Ω Actuating range:
Bit 0 = "1", bit 2 = "0" (in the PII)
Response to falling temperature
> 750 Ω Actuating range:
Bit 0 = "1", bit 2 = "0" (in the PII)
750 Ω to 540 Ω Advance warning range:
Bit 0 = "0", bit 2 = "1" (in the PII)
< 540 Ω Normal range:
Bit 0 = "0", bit 2 = "0" (in the PII)
(RRT-5) °C
(RRT+5) °C
(RRT+15) °C
Measurement volt‐
age
Voltage at PTC
Max. 550 Ω
Min. 1,330 Ω
Min. 4,000 Ω
Max. 7.5 V
RRT = Rated response temperature
ET 200PA SMART I/O modules
10.4 Analog input modules
ET 200PA SMART
Operating Instructions, 06/2019, A5E34192013-AB 163
To Next Page
Loading...
Need help?
General
