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2... OMP-MODL System Base
Using the OMP-MODL
2-10
Relay R2 (Terminals 5 & 6)
Wiring connections for Output Relay 2. The relay is a normally open
device with contacts rated for 500 ma MAX at 32VDC MAX.
Operation is dependent on logic associated with the Relay Alarm #2
icon within the Program Net executing in the logger.
+5V (Terminal 7)
This terminal provides a current limited, voltage regulated +5 VDC
supply for alarm and sensor excitation applications. The supply is
current limited to approximately 100mA and is short-circuit
protected. ON/OFF control of the output is dependent on logic
associated with the +5 Volt Out icon within the Program Net
executing in the logger.
Loads should be connected between Terminal 7 ( + ) and GND at
Terminal 9 ( - ).
TTL Alarm Output (Terminal 8)
A low current 5Vdc rated digital output is available from this terminal
under control from the Digital Alarm #1 icon within HyperNet. The
output swings from 0 to 5VDC relative to the GND terminal (terminal
9) and is intended for sourcing and sinking signal level loads only.
The output is current limited with an internal 4.3Kohm series resistor
which results in varying output voltage levels as a function of load or
sourced current as shown in Figure 2... -5. This Digital Output
provides sufficient current for control of the Omega Engineering
RPS-1, Rechargable Power Supply which can be used for powering/
exciting higher current sensors such as 4-20mA transmitters (see
Accessories in Appendix H).
GND (Terminal 9)
This terminal serves as a common or ground connection for the
Digital Outputs and for the +5V supply. It is connected directly to
the OMP-MODL circuit ground.
Figure 2... -6: System Base Digital Output
(TTL) Current Sourcing Characteristics