Connecting 24 V Digital Inputs; Connecting 24 V Digital Outputs - Siemens SIMATIC S5 Manual

Installation Guidelines
3.2.1

Connecting 24 V Digital Inputs

The signal cables of sensors in the plant are to be connected via the 9-pin sub D connector of the
IP 265 labelled "INPUT". The digital inputs of the IP 265 are designed for 24 V DC and must be
non-floating. For the power supply of the input circuit, 24 V DC must be supplied via the load voltage
connector on the front of the module ( Section 3.3).
The maximum length of the signal cables is 100 m. The signal cables must be shielded.
Figure 3-1 shows two connection examples for the 24 V inputs of the IP 265.
I
1
6
I
2 I
7
N
3
P
8
U
4
9
Ground (24 V)
T
5
Figure 3-1. Typical Connection for 24 V Digital Inputs
3.2.2

Connecting 24 V Digital Outputs

The signal cables to the actuators in the plant are to be connected to the 9-pin sub D socket "OUT-
PUT". The digital outputs of the IP 265 are to be designed for 24 V DC and must be non-floating.
For the power supply of the output circuit, 24 V DC must be supplied to the load voltage connector
on the front of the module ( Section 3.3).
Signal cables with a maximum length of 100 m can be used. Parallel connection of the 24 V outputs
is only allowed in pairs. The output current per 24 V output is thus 0.8 times the rated current.
Figure 3-2 shows a connection example for the 24 V outputs of the IP 265.
5
O
9
4
U
8
T
3
P
7
2
U
6
T
1
Figure 3-2. Typical Connection for 24 V Digital Outputs
3-2
Sensor
0.0
0.1
BERO
Ground (24 V)
Q 0.5
+
V
sensor
-
=24 V
Lamp
Load voltage
connector
L+
PS 931
(24 V DC)
M
Load voltage
connector
L+ PS 931
(24 V DC)
M
EWA 4NEB 812 6130-02a
IP 265