BAILEY 6637517A1 Replacement Module for INFI 90

The BAILEY 6637517A1 Replacement Module for INFI 90 is a circuit-board assembly used in the Bailey INFI 90® distributed control system. Based on available evidence, it is a miscellaneous (MISC-series) interface/keyboard circuit card belonging to the Bailey 6637xxx board family.

Key Features

1. Circuit-board assembly for the Bailey INFI 90® DCS product family
2. Associated with the Bailey "660-MISC" miscellaneous board series
3. Likely an interface / keyboard-interface class card within the INFI 90 operator or cabinet subsystem
4. Standard INFI 90 module form factor (one-slot plug-in module)
5. Field-replaceable board, typically used in power, process, and infrastructure plants with legacy INFI 90 DCS

1. Type Designation: 6637517A1
2. Product Type: INFI 90 system circuit board
3. System: Bailey INFI 90® DCS
4. Board Family: Bailey 6637xxx
5. Mounting: One slot in a standard INFI 90 module mounting unit
6. Dimensions / Weight: approx. 3.7 × 31.7 × 17.8 cm, approx. 0.1–0.24 kg
7. Origin: United States

Installation Notes

1. Verify the board's actual function and pinout against the INFI 90 cabinet drawing before installation — do not rely on conflicting market listings.
2. De-energize the INFI 90 power system before inserting or removing the board from its slot.
3. If the board belongs to the operator console subsystem, confirm the cable routing to the keyboard/interface panel per the original console manual.
4. After installation, verify module status via the INFI 90 diagnostics / operator station before returning the loop to service.

1. Is 660-MISC-3311 the same part? Multiple different Bailey part numbers (6637517A1, 6637804CI, 6637849E1, IMDS001) have been associated with "660-MISC-3311" by different dealers, so the 660-MISC-3311 reference itself is unreliable as a unique identifier and should not be used alone for ordering.
2. Can this board be ordered as a "digital input module"? Only if confirmed by documentation. The "16-channel digital input" description appears in low-credibility listings only and conflicts with other listings; ordering it as a DI module without verification risks receiving a wrong part.

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