Siemens SIMATIC S5 CP 523 Manual page 39

CP 523
CPU 944 (TTY active) - CP 523 (TTY passive)
CPU 944
+
Ground
+
Ground
Figure 3-11. Pin Assignments for CPU 944 (TTY Active) to CP 523 (TTY Passive)
EWA 4NEB 811 6044-02a
20 mA (11)
TTY OUT+ (6)
TTY OUT - (7)
(5)
20 mA (13)
TTY IN+ (9)
TTY IN - (2)
(12)
Shield (1)
Shield (8)
Hardware Installation
(6) TTY IN+
(8) TTY IN -
(10) TTY OUT+
(12) TTY OUT -
(24) Shield
(25) Shield
CP 523
3-11