Alpha Technologies Cordex Controller Panel Mount_Rack Mount - Manual (Page 19)

Argus Technologies Ltd. 018-587-C0 Rev A WC
Printed in Canada. © 2008 Argus Technologies Ltd. ARGUS and CORDEX are trademarks of Argus Technologies Ltd. All Rights Reserved. Page 9 of 19
5.6.2 Midpoint Monitoring (connection examples)
An analog signal configured (at the factory) for voltage can be used for mid-point monitoring. Channel V1 is used
in the examples below but any of the available 60V voltage channels can be used.
NOTE: See CXC Software manual for detailed instruction on programming.
Connect as shown ensuring correct polarity in each case:
Figure 5–Connection examples for mid-point monitoring
5.7 Digital Inputs
The digital input channels (terminals 21 through 36) are used to monitor various alarm and control signals. All
input channels are voltage activated and accept a bipolar (i.e. negative or positive) DC signal directly.
5.7.1 Connection Method
Typical Argus systems use the “reset with Hot and trigger with Ground” connection. The digital input is wired in
such a way that the Hot is wired directly into one of the input terminals; e.g., positive input for +24V or negative
input for –48V systems. The other input terminal is wired to the Ground (common) of the system through a relay
(dry contact – usually located on the equipment requiring monitoring). This method (see Figure 6) allows the
digital input to receive (or not receive) a Ground signal on an alarm.
Figure 6–Showing connection method for +24V input
5.7.2 Programming the Digital Input
The digital input channels can be programmed for “active high” or “active low.” Active high indicates “alarm on the
presence of a ground signal” and active low indicates “alarm on the removal of a ground signal.”
NOTE: See CXC Software manual for detailed instruction on programming.
Voltage Range (Vdc)
Voltage Level (Vdc)
Considered As “0” (Off) Voltage Level (Vdc)
Considered As “1” (On)
0—60
(system voltage setting)
0—3 18—60
Table A–Voltage level definitions for digital inputs