Connecting Digital Modules - Siemens SIMATIC S5-100U System Manual

S5-100U
3.2.3

Connecting Digital Modules

All I/O modules are plugged into bus units. Connect the I/O modules to the terminal blocks of the
bus units. The connections illustrated in this section are of the screw terminal type (SIGUT
connection method).
You can also use the crimp snap-in connection method described in section 3.2.1. In both cases,
the terminal assignments are marked on the terminal blocks.
The assignments listed in Table 3-2 always apply for connecting the load voltage.
Load Voltage
24 V DC
115/230 V AC
* 115/230 V AC digital modules can be operated with a load voltage of 120/230 V AC.
Note
For digital outputs, energy is temporarily stored in an internal capacitor for about
100 ms after the L+ supply is switched off.
Please note that this energy may be sufficient to activate low-rating loads (e.g., pulse
valves) for a triggered output.
EWA 4NEB 812 6120-02b
Table 3-2. Connecting the Load Voltage
Terminal 1
L+
L1
Installation Guidelines
Terminal 2
M
N
3-13