Siemens SIMATIC S5-100U System Manual page 54

Installation Guidelines
Connecting Eight-Channel Digital Modules
These modules do not have a two-wire connection. You therefore need an external distribution
block.
The eight channels of a module are numbered from .0 through .7. One terminal on the terminal
block is assigned to each channel. The terminal assignment and the connection diagram are printed
on the front plate of the module.
Connecting Eight-Channel Input Modules
The sensors must be connected to terminal 1 via the L+ terminal block.
Example: Connecting a sensor to channel 4 (address I 3.4) on an input module in slot 3
(see Figure 3-14)
L+
1
F
2
M
.0
.1
.2
.3
.4
.5
10
.6
.7
DIGITAL INPUT
8 x 24 V DC
6ES5 421-8MA12
1 2 3 4 5
Figure 3-14. Connecting a Sensor to Channel 4
3-16
4
3
6
5
8
7
9
4
6
5
1 3
2 4 6
L+ M
L+Terminal
S5-100U
7 9
10
8
Sensor
EWA 4NEB 812 6120-02b