| Number of channels per module | 
2 | 
| Distribution of channels into groups | 
1 group for 2 channels | 
| Connection of the channels AO0+…AO1+ | 
Terminals 1.5…1.6 | 
| Reference potential for AO0+ to AO1+ | 
Terminal 1.7 (AO-) for voltage outputTerminal 1.9, 2.9     and 3.9 for current output | 
| Output type | 
  | 
|   | 
Unipolar | 
Current | 
|   | 
Bipolar | 
Voltage | 
| Electrical isolation | 
Against internal supply and other modules | 
| Configurability | 
-10…+10 V, 0…20 mA, 4…20 mA (each output can be     configured individually) | 
| Output resistance (load), as current output | 
0…500 Ω | 
| Output loadability, as voltage output | 
±10 mA max. | 
| Indication of the output signals | 
1 LED per channel (brightness depends on the value of     the analog signal) | 
| Resolution | 
12 bits (+ sign) | 
| Conversion error of the analog values caused by non-linearity,     adjustment error at factory and resolution within the normal range | 
Typ. 0.5 %, max. 1 % | 
| Relationship between input signal and hex code | 
Table Output Ranges Voltage and Current PROFINETâ IO Bus Module     CI501-PNIO (V3) | 
| Unused outputs | 
Are configured as “unused” (default value)     and can be left open-circuited |