Siemens X-400 - Manual (Page 92)

Installation and Commissioning
Operating Instructions for SCALANCE X-400 Industrial Ethernet Switches
92 C79000-G8976-C186-03
6.6.3 Digital Input Connectors (X1)
Polarity Reversal Protection X1, X2
The two 5-pin male connectors (X1, X2) of the digital inputs 1 through 8 have no
polarity reversal protection. If the connectors are accidentally swapped over, this
does not cause damage or destroy circuits. In display modes A and C or B and D,
incorrect inputs are displayed during the time the connectors are swapped over.
Digital inputs 1 through 4 are connected using a 5-pin connector at the front termi-
nal block on the DI module.
X 2
X 1
I N 2 M 4 I N 3 I N 4 I N 1
Figure 6-11 Pin assignment of connector X1 (Inputs 1 through 4)
Conn. 1 IN1 Digital input 1
IN2 Digital input 2
M4 Ground
IN3 Digital input 3
IN4 Digital input 4
! Warning
The input voltage must not exceed + 30 V and must not fall below – 30 V, other-
wise the DI module will be destroyed.