Hardware and Connections
2-43
7SA6 Manual
C53000-G1176-C156-2
The system of numbers and letters used to designate the plug-in terminals is illustrat-
ed in Figure 2-15.
Figure 2-41 Correlation between plug-in terminals and connection numbers/letters
Each plug-in terminal forms a complete set of connections that consists of three pins
arranged as follows:
Pin a: Signal connection
Pin b: Common connection
Pin c: Shielding connection
The signal pins are the only terminal pins that are directly connected to the internal
printed circuit boards of the 7SA6. Depending on the version of the terminal block, 18
or 12 signal connections are provided. Refer to Figure 2-16.
There are two isolated groups of common pins. Within a group the pins are inter-con-
nected as shown in Figure 2-16. The common pins “b” are not connected to the boards
inside the 7SA6. Each common group can, for example, be used for signal multiplica-
tion or as a common point for a signal (independent of the signals on the pin “a” termi-
nals). Depending on the version of the terminal block, 18 or 12 common connections
are available.
Grouping of common connections within a terminal block is as follows:
12 terminal block: Group 1 Terminals 1 through 6
Group 2 Terminals 7 through 12
18 terminal block: Group 1 Terminals 1 through 9
Group 2 Terminals 10 through 18
All shielding pins are connected together as shown in Figure 2-16. The shielding pins
are also connected to the housing. Depending on the version of the terminal block, 18
or 12 shielding connections are provided.
1
abc
2
12
abc
Plug-in terminal 2
Plug-in terminal 1
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