Siemens ESM - Manual (Page 55)

Interfaces, Displays and Operator Controls
Industrial Ethernet OSM/ESM
C79000-Z8976-C068-10
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Power Supply
The power supply can be connected redundantly. Both inputs are isolated. There is
no load distribution. With redundant power supply, the power supply unit with the
higher output voltage supplies the OSM/ESM alone.
Signaling Contact
The following is signaled via a floating signaling contact (relay contact) when
contact is broken:
• The failure of a monitored power supply. Which power supply is monitored is
specified in the fault mask (see Section 4.2.3).
• The incorrect link status of a monitored port (in other words, the port is not
correctly attached or there are no link test pulses coming from the partner
device). The ports to be monitored are selected using the fault mask.
• When at least one port is segmented.
• If the DIP switch setting was changed during operation.
(Inconsistency between the switch setting and the actual operating state
because the switch setting is adopted only after a restart)
In the RM Mode (additional)
• The incorrect link status of port 7 or port 8 of the OSM ITP62, OSM ITP53, ESM
ITP80, OSM TP62, ESM TP80, and OSM BC08 or of port 3 or port 4 of the
OSM TP22 and ESM TP40, regardless of the status of the fault mask.
• When a second OSM is switched to the RM mode in the same ring.
OSM/ESM in Normal Mode and ITP XP Standard Cable 9/9 Plugged into the
Standby-Sync Port:
• Short-circuited ITP XP Standard Cable 9/9
• Bad standby configuration: The partner device connected via the ITP XP
Standard Cable 9/9 is not switched to standby.
• If there is an incorrect link status on a standby port.