Omega Engineering OMB-DBK-34A, User Manual

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DBK25
8-Channel Relay Output Card
Overview …… 1
Hardware Setup …… 2
Card Connection …… 2
Card Configuration …… 2
DaqBook and DaqBoard and DaqBoard/2000 Connection …… 4
DaqBook and DaqBoard Configuration …… 4
Software Setup …… 4
DBK25 – Specifications …… 4
Reference Notes :
o
Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to your
system, as needed.
o
In regard to calculating system power requirements, refer to DBK Basics located near
the front of this manual.
o DBK25 users may be interested in the DBK208 module. DBK208 is a Carrier Board for Opto-22
Compatible Solid-State-Relays . Refer to the DBK208 section for additional information.
Overview
DBK25 provides 8 normally-open relay contacts for isolated switching of AC or DC loads or signals via
the LogBook’s P2 digital port or via the Daq device’s or adapter’s P2 digital port. The P2 port operating in
the expanded-I/O mode can address up to 32 DBK25s (256 relays max). The DigiBook/72 with 3 P2 ports
can address 96 DBK25s for up to 768 relay contacts. The relays are 2-coil sub-miniature latching relays
and do not require continuous current to stay closed. Such bi-stable relays can act as an 8-bit non-volatile
write-only memory byte.
The steady-state power drain of the DBK25 is very low, less than 1 mA at 5 VDC. It is practical, even
operating on a battery, to have hundreds of relay contacts. The stored-energy operation of the DBK25 does
limit the practical on/off speed (or the ability to generate 50% duty cycles) to about 10 Hz. The relay's
operating time is less than 15 ms.
DBK Option Cards and Modules
879795
DBK25, pg. 1