Signaling Contact - Siemens SIMATIC NET SCALANCE X-100 Series Operating Instructions Manual

Installation, connecting up, sources of problems
4.2 Connecting up
The device is designed for operation with safety extra-low voltage. This means that only
safety extra-low voltages (SELV) complying with IEC950/EN60950/ VDE0805 can be
connected to the power supply terminals.
The power supply unit for the device power supply must meet NEC Class 2, as described
by the National Electrical Code(r) (ANSI/NFPA 70).
The power of all connected power supply units must total the equivalent of a power source
with limited power (LPS limited power source).
If the device is connected to a redundant power supply (two separate power supplies), both
must meet these requirements.
The signaling contact can be subjected to a maximum load of 100 mA (safety extra-low
voltage (SELV), 24 V DC).
Never connect the device to AC voltage.
Never operate the device with DC voltage higher than 32 V DC.
4.2.2

Signaling contact

Signaling contact
The signaling contact (relay contact) is a floating switch with which error/fault states can be
signaled by breaking the contact.
The signaling contact is connected to a 2-pin plug-in terminal block.
Figure 4-6
Figure 4-7
46
WARNING
Signaling contact SCALANCE X-100
Terminal block, two-pin
SCALANCE X-100
Operating Instructions, 04, A2B00060666D