Siemens SIMATIC ET 200SP System Manual page 92

Wiring
5.11 Labeling ET 200SP
● Color coding of the potential group
– Opening the potential group: Light-colored terminal box and light-colored mounting rail
– Further conduction of the potential group: Dark-colored terminal box and dark-colored
● Color coding of the spring releases
– Process terminals: gray, white
– AUX terminals: turquoise
– Additional terminals: red, blue
– Terminals for self-assembling voltage buses P1, P2: red, blue
92
release button
mounting rail release button
①
Module labeling
②
Color coding of the module classes
③
Color coding of the potential group
④
Color coding of the spring releases (by group)
Figure 5-30 Factory markings
Distributed I/O system
System Manual, 12/2015, A5E03576849-AF