Siemens S5-135U/155U - Manual (Page 469)

9-87
System Manual
C79000-G8576-C199-06
9.6.6 Connecting the Signal Lines
For connection of the signal lines, front connectors for 20 and 40 mm
mounting width with crimp connection and 40 mm mounting width with
screw connection are available (screwdriver blade width: 3.5 mm, maximum
torque: 0.8 Nm).
Use stranded conductor to facilitate handling of the front connector. Ferrules
are not required for screw connections, because the screw terminals are
provided with wire protection.
When the crimp contact is inserted in the plastic body of the front connector,
a click can clearly be heard. This indicates that the contact is engaged. For
jumpering or to correct the wiring, you can remove the contacts with a
releasing tool (see ordering information) without having to pull out the front
connector.
Ferrules are not required for screw connections, because the screw terminals
are provided with wire protection. You can use ferrules of 7 mm in length to
DIN 46228. The maximum terminal area is 2 x 2.5 mm
2 .
!
Caution
Only extra-low voltage 60 V DC with safety separation from system voltage
may be used for the 24 V DC supply and for the 24 V DC input signals.
Safety separation can be implemented to the requirements of, amongst other
sources, VDE 0100 Part 410/HD 384-4-41/IEC 364-4-41 (as functional
extra-low voltage with safety separation) or VDE 0805/EN 60950/IEC 950
(as safety extra-low voltage SELV) or VDE 0106 Part 101.
Analog Input/Output Modules