How can I safely test the functionality of an input?
PT100, 3-wire
For testing, link terminals 10 and 11 of input 1, and connect a fixed resistor or resistance decade between 9 and 10.
| Value of resistor / resistance decade setting |
Display value |
| 18.52 ohms | -200 °C |
| 100 ohms | 0 °C |
| 109.73 ohms | 25 °C |
| 390.481 ohms | 850 °C |
Thermocouple
For testing, link terminals 10 and 11 of input 1.
If the input is working correctly, the controller will indicate the ambient temperature.
Current/voltage input
For testing, configure input 1 to 0-20mA or 0-10V.
If the input is open-circuit, the display will indicate the lower scaling value (start of display range).
If a 20 mA or 10 V source is connected, then the upper scaling value (end of display range) will be indicated. As standard, this corresponds to 0-100 %.