3.9.2
Connecting
Pin assignment
Table 3- 9
Pin assignment for BaseUnit BU20-P12+A4+0B
Terminal
1 to 12
1A, 2A, 3A, 4A, AUX
Block diagram
①
②
③
④
⑤
Figure 3-18
BaseUnits (6ES7193-6BP.../3RK1908-0AP00...)
Manual, 12/2016, A5E03727049-AG
Pin assignment for BaseUnit BU20-P12+A4+0B
Assignment is determined by the I/O module.
See manual I/O Module
(http://support.automation.siemens.com/WW/view/en/55679691/133300).
Protective conductor connection or voltage bus (freely usable up to 230 V AC/ DC with
max 10 A). If you connect a voltage, it must belong to the same potential group as the
rated supply voltage.
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-P12+A4+0B
BaseUnits for I/O modules
3.9 BU20-P12+A4+0B (BU type B0)
Descriptions
47