Product Overview
The Honeywell 900A16-0001 is a 16-point high-level analog input module designed for the Honeywell ControlEdge HC900 process and safety controller platform, where it serves as the primary interface between field transmitters and the controller’s control strategy. Each of the sixteen channels is independently configurable for either voltage or current operation, so a single card can carry a mixture of 4-20 mA pressure loops, 0-10 V position feedback signals and 1-5 V analyzer outputs without any external signal conditioning or range-specific hardware variants.
What elevates the Honeywell 900A16-0001 above a conventional analog card is its isolation architecture and conversion performance. Every input is galvanically isolated point-to-point at 400 V DC through solid-state switching, and isolated to the logic side at 1000 V DC, which means a ground fault, lightning-induced surge or common-mode disturbance on one field loop cannot propagate into neighbouring channels or corrupt the backplane. A 15-bit plus sign analog-to-digital converter delivers a module-level update rate of 100 ms, with factory accuracy of ±0.1 percent of range that can be tightened to ±0.05 percent through field calibration, and temperature drift limited to ±0.01 percent of full scale per degree Celsius.
Within the HC900 architecture, the Honeywell 900A16-0001 plugs into any available slot of a local or remote I/O rack and is auto-recognised by the controller on insertion, supporting removal and insertion under power so that maintenance can proceed without a system shutdown. Channels scale to 2304 galvanically isolated analog inputs on larger C70 and C75S configurations, making the Honeywell 900A16-0001 equally at home in a single-skid packaged unit and in a plant-wide distributed control system with remote I/O racks connected over supervised networks.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 900A16-0001 |
| Manufacturer | Honeywell |
| Product Type | High-Level Analog Input (HLAI) Module |
| Compatible System | Honeywell ControlEdge HC900 Process & Safety Controller (C30, C50, C70, C75S CPUs); local and remote I/O racks |
| Input Channels | 16, individually configurable per point for voltage or current |
| Input Signal Types | Current 0-20 mA and 4-20 mA; voltage 0-5 V, 1-5 V, 0-10 V (plus bipolar ranges as configured) |
| Input Impedance | Greater than 1 MΩ in voltage mode; 250 Ω in current mode (per-channel shunt resistor selectable) |
| A/D Resolution | ±15 bits (16-bit class) with sign |
| Accuracy | ±0.1% of range factory configured; ±0.05% of range with field calibration |
| Temperature Effect | ±0.01% of full scale per °C maximum |
| Update Rate | 100 ms per module (analog-to-digital conversion synchronized with controller execution) |
| Galvanic Isolation | 400 V DC point-to-point via solid-state switching; 1000 V DC input to logic/backplane |
| Common-Mode Rejection | Greater than 90 dB at 120 V AC, 50/60 Hz |
| Diagnostics | Continuous monitoring of factory calibration, field calibration, 24 V DC supply and configuration; per-channel failsafe value on communication loss |
| Power Supply Loading | 5 V DC at 75 mA maximum; 24 V DC at 50 mA maximum (backplane powered) |
| Wiring Interface | 36-position Euro-style terminal block (900TEK-0001) or barrier-style terminal block (900TBK-0001); Remote Terminal Panel (RTP) with pre-wired cables optional |
| Hot-Swap Capability | Removal and Insertion Under Power (RIUP) supported; auto-configured on insertion |
| Dimensions (H × W × D) | Approximately 137 mm × 35.6 mm × 148 mm |
| Weight | Approximately 397 g |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 5% to 95%, non-condensing |
| Certifications | CE, UL, cUL, CSA; suitable for Class I Division 2 hazardous locations as part of a listed HC900 assembly |
Main Features and Advantages
Per-channel voltage or current configurability: The most practical strength of the Honeywell 900A16-0001 is that each of its sixteen points can be independently assigned to current or voltage operation through the Process Control Designer or Hybrid Control Designer software, with 250 Ω shunt resistors enabled per channel where current measurement is required. This removes the usual compromise of buying separate voltage cards and current cards, allows a mixed-signal panel to be built from one part number, and lets a channel be reassigned later when a field instrument is upgraded — a change that costs minutes in software rather than a hardware purchase and a shutdown window.
Point-to-point galvanic isolation for fault containment: With 400 V DC point-to-point isolation and 1000 V DC isolation to logic, the Honeywell 900A16-0001 prevents the classic domino failure where one grounded transmitter drags down an entire card. In real installations this is the difference between losing one measurement and losing sixteen, and it also eliminates the cost of external loop isolators that would otherwise be needed to break ground loops between instruments referenced at different potentials. High common-mode rejection above 90 dB further protects measurement integrity in plants with variable-frequency drives, large motors and long cable runs.
Measurement quality that supports tight control: A 15-bit plus sign converter, ±0.1 percent factory accuracy improving to ±0.05 percent after field calibration, and drift of only ±0.01 percent of full scale per degree Celsius mean the Honeywell 900A16-0001 delivers data good enough for demanding PID loops rather than just indication quality. The 100 ms module update rate, with conversion synchronized to controller execution rather than running on an independent slower scan, removes data handoff latency, and because all analog input modules in a rack convert in parallel, expanding the I/O does not lengthen the controller scan.
Diagnostics, failsafe behaviour and serviceability: The Honeywell 900A16-0001 continuously monitors its own factory and field calibration data, its 24 V DC supply and its configuration, and reports channel-level faults to the controller so that sensor and wiring problems surface as alarms rather than as unexplained process deviations. Each point supports a user-defined failsafe value that is applied if communication with the controller is interrupted, which is essential for predictable behaviour during a CPU failover. Combined with RIUP hot-swap support and LED status indication, a failed Honeywell 900A16-0001 can be replaced in minutes with the process running.
