User manual
3 Systemoverview| General description of I/O modules
12 1432790000/08/12.2015Manual u-remote
3.3 General description of I/O modules
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I/O module (Example UR20-4-DI-P)
1 Release lever for the DIN rail fixing
2 System bus
3 System current path
4 Input current path
5 Output current path
6 Seats for module markers
7 Type designation
8 Swivel marker for labelling modules and channels (optional)
9 Connector frame unlocking device
10 Module status LED (collective message)
11 Connector
12 Channel status LEDs
13 Latching hook for latching onto module sides
14 DIN rail foot
15 Type plate
Colour coding
The removal lever for the electronic unit as well as the con-
nectors are colour-coded as follows:
Black standard
White power supply
Red 230V
Yellow functional safety
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I/O module components
1 Base module
2 Electronic unit
3 Removal lever for electronic unit
4 Connector frame
5 Connector
6 Plug-in unit
A detailed description of the individual module types is avail-
able in Chapter6.