Connecting The Digital Inputs; Technical Specifications - Siemens RUGGEDCOM RSG920P Installation Manual

Chapter 2
Installing the Device
Figure 8: Failsafe Alarm Relay Wiring
1. Failsafe Alarm Relay Terminal 2. Normally Open Terminal 3. Common Terminal 4. Normally Closed Terminal
Section 2.7

Connecting the Digital Inputs

The RUGGEDCOM RSG920P offers two independent digital inputs for monitoring external equipment. Each digital
input is associated with an alarm that is configured in RUGGEDCOM ROS. Depending on the configuration, the
associated alarm may be triggered if the digital input is in either the HIGH or LOW state.
Each input operates in one of two modes:
• Passive Mode
Supports the use of passive switches, such as a cabinet door switch, relay or a leak detector, where each digital
input detects if it is open or closed.
• Direct Mode
Supports direct inputs from external equipment. A voltage between 10 and 30 V indicates state 1, while a
voltage between -30 and 8 V indicates state 0. In the undetermined range between 8 and 10 V, the input may
be determined to be in either state.
The nominal input voltage is 24 VDC.
NOTE
For information about configuring the digital input alarms, refer to the RUGGEDCOM ROS User Guide
for the RUGGEDCOM RSG920P.
NOTE
For technical specifications related to the digital input ports, refer to
Specifications".
To connect a digital input, do the following:
1. Secure a European-style terminal block (or Euroblock) to the terminal.
2. Connect the positive cable to the DI1/2+ terminal.
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Section 5.5, "Digital Input
Connecting the Digital Inputs
RUGGEDCOM RSG920P
Installation Guide