Process I/O Modules - Omni 4000 Series Installation Manual

3.7.5 Process I/O Modules

The Process I/O modules are factory-installed in the following order:
•
A module
•
B module
•
E/D module
•
E module
•
HT module (single transmitter)
•
HM module (multiple drop mode transmitter)
The HT/HM HART module is used to interface to HART devices using the HART FSK protocol.
The module has four independent HART FSK networks along with two analog outputs. The HT
module is used for point to point communications and can support four single variable devices per
network. The HM Module is used for multi-drop configurations or multi-variable sensors.
The flow computer can handle up to six HT/HM modules.
Refer to the Technical Bulletin 090003 (52-0000-0019) for additional information on
the HT/HM modules.
The Process I/O modules are installed in the chassis and are connected to the back panel
terminal block with 12 wires on an internal ribbon cable.
CAUTION:
•
•
CAUTION: Always follow the OMNI factory module order. Each terminal block
corresponds to an I/O module slot on the motherboard. If the order of the modules is
modified, the reference to the terminal blocks will be altered.
Refer to the standard drawings that were supplied with the flow computer to determine the factory
default input settings. If different settings are required, go to Section 7 Troubleshooting for
installation troubleshooting.
Connect wiring from the back-panel terminal pinouts to field devices according to project-specific
drawings. Table 3-7 provides guidance for back panel wiring.
3-29
OMNI 4000/7000 Installation Guide – Rev H
Use 4-wire Resistance Temperature Detectors (RTDs) when connecting to a
Process I/O module's back panel terminal block.
2- or 3-wire RTDs may result in less accurate measurement or possible signal
loss.
Installation