Connecting Up - Siemens SIMATIC ET 200SP Manual

BaseUnits for I/O modules
3.14 BU20-P8+A4+0B (BU type F0)
3.14.2

Connecting up

Pin assignment
Terminals of a potential group
1 to 4
9 to 12
P1, P2, AUX (1A to 4A)
The AUX terminals may only be used with an identical voltage or PE associated with the
supply voltage.
Block diagram
①
②
③
④
⑤
Figure 3-28
66
Fail-safe module
Overvoltage category 3
(http://support.automation.siemens.com/WW/view/en/55679691/133300)
(http://support.automation.siemens.com/WW/view/en/55679691/133300)
SELV/PELV
(max. 10 A)
Backplane bus
I/O module
Terminals with connection to the I/O module
Connected voltage buses without connection to the terminals
Connected AUX busbar connected to the terminals
Block diagram BU20-P8+A4+0B
Up to 230 VAC/VDC (AC only one phase)
Assignment is determined by the I/O module.
See manual I/O Module
Safe extra low voltage SELV/PELV
Assignment is determined by the I/O module.
See manual I/O Module
Up to 230 VAC/VDC (AC only one phase)
BaseUnits (6ES7193-6BP.../3RK1908-0AP00...)
Non-fail-safe module
Overvoltage category 2
SELV/PELV
or
(max. 10 A)
Manual, 12/2016, A5E03727049-AG