Siemens SIMATIC S5-95U - Page 25

S5-95U, Second Serial Interface Point-To-Point Link
Linking the S5-95U as master with the CP 521 SI (TTY passive) as slave (TTY active)
Cable length: < 100 m
Figure 2-5 Pin Assignments S5-95U (TTY Active) - CP 521 SI (TTY Passive)
20 mA
TTY OUT+
TTY OUT -
M
M
20 mA
TTY IN+
TTY IN
-
M ext
M ext
S5-95U CP 521 SI
Shield / Mext
13
9
2
12
11
6
7
15
18
21
9
7
1
8
TTY IN+
TTY IN -
TTY OUT+
TTY OUT -
M
10
Note
If the wiring is incorrect, the SI2 interface can be destroyed.
EWA 4NEB 812 6095-02 2-5