Connecting External I/Os - Siemens SIMATIC S5-90U System Manual

Installation Guidelines
Connecting Interrupt and Counter Inputs
There are four interrupt inputs and two counter inputs available in the S5-95U. The interrupt inputs
and counter inputs have the same internal grounding point as the PLC. Use a 9-pin sub D connector
to connect the signal cables for these inputs to the PLC.
Example: Sensor S1 is to be connected to interrupt input I 34.0.
M
PINs 1; 3 and
5 are
interconnec- M
ted internally
All other interrupt inputs (I 34.1 to I 34.3) can be connected to the S5-95U in the same way as
I 34.0.
Example: A pulse generator is to be connected to counter A (IW 36).
24 V
Counter B (IW 38) can be connected analogously to counter A.
3.3.6

Connecting External I/Os

All I/O modules are plugged into bus units. Connect the I/O modules to the terminal blocks of the
bus units.
Both SIGUT screw-type connections and crimp-snap-in connections can be used (see Section
3.3.1). In both cases, the terminal assignments are marked on the terminal blocks.
The I/O modules are described in Chapters 15 and 16. Connection diagrams are shown for all
modules. The PIN number in the connection diagram is identical to the number stated on the
terminal block of the bus unit or crimp-snap-in/screw-type connector.
3-24
1
Interrupts
6
2
7
3
8
4
9
5
Figure 3-24. Connecting the Interrupt Inputs
Counter B IW 38
Counter A IW 36
M
Figure 3-25. Connecting a Counter Input
S5-90U/S5-95U
S1
1 I 34.0
1 I 34.1
2 I 34.2
3 I 34.3
M
1
M
6
2
PINs 1; 3
7
3
and 5 are
M
8
intercon-
4
9 nected
5
internally
EWA 4NEB 812 6115-02b
24 V