| Number of channels per module | 
Max. 4 | 
| Distribution of channels into groups | 
1 group of 4 channels | 
| Connections of the channels AI0+ to AI3+ | 
Terminals 1.0 to 1.3 | 
| Reference potential for the inputs | 
Terminals 1.9, 2.9 and 3.9 (ZP) | 
| Indication of the input signals | 
1 LED per channel | 
| Input signal voltage | 
24 V DC | 
|   | 
Signal 0 | 
-30 V…+5 V | 
|   | 
Undefined signal | 
+5 V … +13 V | 
|   | 
Signal 1 | 
+13 V…+30 V | 
| Input current per channel | 
  | 
|   | 
Input voltage +24 V | 
Typ. 7 mA | 
|   | 
Input voltage +5 V | 
Typ. 1.4 mA | 
|   | 
Input voltage +15 V | 
Typ. 3.7 mA | 
|   | 
Input voltage +30 V | 
< 9 mA | 
| Input resistance | 
Ca. 3,5 kΩ |