Installation MS20/MS30
Release
11
07/2013
39
2.9 Terminal block for supply voltage and signal
contact
The supply voltage and the signal contacts are connected via a 4-pin terminal
block and a redundant 4-pin terminal block with a snap lock.
2.9.1 Supply voltage
Redundant power supplies can be used. Both inputs are uncoupled. There is
no distributed load. With redundant supply, the power supply unit supplies
the device only with the higher output voltage. The supply voltage is
electrically isolated from the housing.
Note: With non-redundant supply of the mains voltage, the device reports a
power failure. You can prevent this message by applying the supply voltage
via both inputs, or by changing the configuration in the Management.
2.9.2 Signal contacts
The signal contact is a potential-free relay contact.
The device allows you to perform remote diagnosis via the signal contact. In
the process, the device signals events such as a line interruption. When an
event occurs, the device opens the relay contact and interrupts the closed
circuit. The management setting specifies which events switch a contact.
You can also use the management to switch the signal contact manually and
thus control external devices.
A break in contact is used to report the following conditions via the potential-
free signal contact (relay contact, closed circuit):
The detected inoperability of at least one of the two voltage supplies
(voltage supply 1 or 2 is below the threshold value).
A continuous detected error in the device (internal supply voltage).
The detected error of the link status of at least one port. The report of the
link status can be masked by the Management for each port. In the default
state, link status monitoring is deactivated.
The temperature of the device is outside the range specified in the
threshold values.
The removal of the ACA.
The following condition is also reported in RM mode:
Ring redundancy guaranteed. By default, there is no ring redundancy
monitoring
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