Connect To Field Devices; Digital I/O Multiplexer - Omni 4000 Series Installation Manual

3.7

Connect to Field Devices

CAUTION: Only personnel who are experienced with field wiring should perform
these procedures.
WARNING: When connecting main system components to the OMNI 4000/7000
back panel, verify that power is not connected to the system.
Follow these general guidelines for back panel wiring:
•
The recommended wire size for back panel terminals is 18-22 AWG.
•
When using a DC Power source, a common DC return is required on the back panel.
•
The recommended wire size for AC input terminals on the extended back panel is 16-
20 AWG.
Before wiring field equipment to the back panel, refer to the following:
•
The standard drawings and product data sheets included with the OMNI 4000/7000 flow
computer for guidance.
•
Your project-specific requirements and wiring diagrams, particularly if project requirements
differ from the factory default and standard drawings.
•
The Technical Bulletins on OMNI's support website for installation options and examples of
specific devices.
OMNI provides wiring diagrams in the standard drawings as a courtesy for guidance.
Project-specific wiring is the responsibility of the installer.

3.7.1 Digital I/O Multiplexer

Each digital I/O point on the DM module may be independently configured as an input or output
through the OMNICONNECT software. The first four digital points can be used for prove detector
switch inputs for conventional pipe provers. All digital points are referenced to the direct current
(DC) return of the flow computer.
Additional I/O points are available by adding one or more optional Digital I/O
Terminal boards (Section 3.7.1 Digital I/O Multiplexer).
Connect wiring from the OMNI 4000/7000 back panel (TB-1) pinouts to a field device according to
the project-specific drawings. Table 3-2 describes the pinouts.
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OMNI 4000/7000 Installation Guide – Rev H
Installation