Overview
Manuals
Channel Pairing
Transmitter Wiring
HART Compatibility
Features:
- Sixteen input channels on a nominal 6-inch non-redundant termination assembly, with 51306309-175 shown in the board drawing.
- Eight dual-channel MTL4544 isolators provide the documented current-input arrangement and support two- or three-wire transmitter configurations.
- Separate F1 IOM-feed and F2 isolator-feed fuses use different current ratings and exact manufacturer spare-part numbers.
The Honeywell CC-GAIX21 is the non-redundant, high-density GI/IS analog input termination assembly in the Series C family. Its exact row in the manufacturer's hardware matrix specifies a 6-inch board, sixteen channels and eight MTL4544 isolators. The board illustration identifies the assembly as 51306309-175 and shows the IOM location, isolator positions and separate feed fuses. These are terminal-assembly characteristics; converter resolution, input filtering and scan timing must be taken from the selected IOM rather than attributed to the IOTA itself.
For an installed loop, the transmitter connects through the specified galvanic isolator before its signal reaches the analog input electronics. The MTL4544 supplies two input paths, and Honeywell illustrates two- and three-wire transmitter connections for its channels. HART communication also requires compatible HART electronics and a suitable field device, not simply an isolator marked for HART. Before installing a spare, verify the full board identity, individual channel assignments, power connections and approved hazardous-area wiring. The non-redundant board does not gain redundant IOM capability by using a similar-looking module or by copying configuration from a redundant IOTA.
The CC-GAIX21 Honeywell Non-Redundant GI/IS Analog Input IOTA may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Honeywell CC-GAIX21 official technical documentation and product links.
This multi-page Honeywell technical document contains the exact model and its technical data. Apply the values to the supplied type number and verify its revision before installation.
Eight MTL4544 isolators provide the sixteen field-input paths. Each isolator serves two channels, so the relationship between a field circuit, an isolator position and the configured IOM channel must be preserved during maintenance. Honeywell lists MTL4599 for unused isolator positions. Do not import the single-channel MTL4541 or temperature-converter MTL4575 options from the larger CC-GAIX11 arrangement into this board's compatibility list.
Honeywell illustrates two- and three-wire transmitter configurations for the MTL4544 channels on CC-GAIX21. Use the appropriate drawing for the actual transmitter supply and return arrangement, and keep shield-grounding requirements separate from signal wiring. A transmitter's current range alone does not establish intrinsic-safety compatibility; the field device, isolator, cable parameters and approved installation must be assessed together.
The supported MTL4544 is a dual-channel 4–20 mA isolator with HART capability. Honeywell's IOM compatibility table lists CC-PAIH02 for HART and CC-PAIX02 for non-HART input arrangements. Select the complete supported combination for the required communication function. An MTL4544 on the terminal board does not convert a non-HART IOM into a HART input module.
