Grounding The Device; Connecting The Failsafe Alarm Relay - Siemens SIMATIC NET RUGGEDCOM RSG920P Equipment Manual

2.4

Grounding the Device

The RUGGEDCOM RSG920P chassis features a threaded hole for connecting the
device to ground (Protective Earth). It is recommended to terminate the ground
connection with an #8 ring tongue or spade lug, and then torque to 1.2 N·m (11 lbf-
in).
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Figure 2.6
2.5

Connecting the Failsafe Alarm Relay

The failsafe alarm relay can be configured to latch based on alarm conditions. The
NO (Normally Open) contact is closed when the unit is powered and there are no
active alarms. If the device is not powered or if an active alarm is configured, the
relay opens the NO contact and closes the NC (Normally Closed) contact.
Note
Control of the failsafe alarm relay output is configurable through RUGGEDCOM
RSG920P. One common application for this relay is to signal an alarm if a power
failure occurs. For more information, refer to the "RUGGEDCOM ROS Configuration
Manual" for the RUGGEDCOM RSG920P.
The following shows the proper relay connections.
RUGGEDCOM RSG920P
Equipment Manual, 10/2023, C79000-G8976-1172-09
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3
Chassis Ground Connection
#8 Ring Tongue
#8-32 Screw
Chassis Ground Connection
Installing the Device
2.4 Grounding the Device
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