CC-PAIX01 Honeywell Analog Input I/O Module

Description

Product Model: CC-PAIX01
Product Brand: Honeywell
Product Series: Experion / Series-C (I/O modules)

Key Features:

• Supports 16 analog input channels (12 single-ended + 4 differential) for voltage/current signals
• Accepts voltage and current inputs (e.g. 0-5 V, 1-5 V, 0.4-2 V, 4-20 mA via 250 Ω)
• High precision: 16-bit resolution, ±0.075 % accuracy (typical)
• Built-in diagnostics, open wire detection, non-incendive field power support, fast loop scan

Product Role & System Fit

Within Honeywell’s Series-C / Experion / C300 control architecture, analog input modules like CC-PAIX01 play a vital role as the interface between field transmitters (sensors) and the control logic. They convert real-world analog signals—current or voltage—into digital values that the controller uses for control loops, trending, alarms, and diagnostics.

The CC-PAIX01 is specifically a high-level analog input module, meaning it expects already-conditioned (voltage or current) signals rather than raw millivolt- or thermocouple-level signals. It thus plugs into the I/O stack (IOM plugged to IOTA, which handles field wiring) within the Series-C I/O system.

It is among the set of Series-C I/O modules enumerated in Honeywell’s I/O spec (EP03-490-520) under “Analog Input with HART – CC-PAIX01 / 02” section.

Because it supports both voltage and current input modes, and offers isolation, diagnostics, and high resolution, CC-PAIX01 is well-suited for mixed-signal environments, retrofitting, or systems that require flexibility in sensor types.

Technical Features & Benefits

Let’s dig into the technical strengths, trade-offs, and best practices for CC-PAIX01.

Input Types & Signal Flexibility

• The module supports both voltage and current signals. Acceptable ranges include 0–5 V, 1–5 V, 0.4–2 V, and 4–20 mA (through a 250 Ω resistor).
• For voltage mode, the input impedance is greater than 10 MΩ (when powered), minimizing loading on the source.
• Differential input support: 4 of the 16 channels are differential to improve noise rejection in certain wiring schemes.

This flexibility means you can mix sensors (some in current loop, some voltage) on a single module—as long as configuration and wiring are correct.

Accuracy, Resolution & Noise Handling

• CC-PAIX01 uses a 16-bit ADC, providing high resolution for fine measurement increments.
• Accuracy is specified around ±0.075 % of full scale at nominal conditions (e.g. 23.5 °C ±2 °C). Over full temperature range, accuracy may degrade to ~±0.15 %.
• Common-mode rejection (DC to 60 Hz, with 500 Ω imbalance) is 70 dB.
• Normal-mode rejection (60 Hz) is about 19 dB.
• The internal filter is a single-pole RC, –3 dB at ~6.5 Hz, which helps attenuate higher-frequency noise.
• Crosstalk (channel-to-channel) is about –60 dB (dc to 60 Hz).

These performance metrics enable stable, reliable readings even in electrically noisy or multi-channel environments.

Scanning & Timing

• The input scan rate is 50 ms per full channel sweep under normal operation.
• The module supports fast-loop scan capability for process-critical loops needing faster updates.
• There is built-in open wire detection and “bad PV” diagnostics for error detection when wiring is broken or out-of-range.

These capabilities help catch wiring faults early and maintain stable process behavior.

Power & Field Interfaces

• The I/O spec indicates that the module supplies non-incendive field power, meaning it can feed the transmitter loops from within the module safely (Class 1, Div 2, non-incendive mode).
• Current limiting circuits protect each channel.
• Jumper configuration: On certain IOTA modules, the 250 Ω load resistor for current mode is connected via a jumper. To use voltage mode, that jumper must be cut for channels being used in voltage mode (especially channels 13–16).

Thus, correct wiring and jumper settings are critical to avoid saturating the module or corrupting readings.

Technical Specifications Table

Here’s a distilled spec table for CC-PAIX01, based on Honeywell’s I/O specification and vendor data:

This table gives you a solid baseline for specification, procurement, and design.

Installation & Maintenance Insights

Here are best practices and caveats for working with CC-PAIX01 in the field.

Wiring & Jumper Configuration

• Carefully plan which channels will be used in voltage mode vs current mode. For those running voltage, the jumper (which connects the 250 Ω resistor) must be removed (cut) to prevent interference.
• For channels 13–16, voltage mode may be enabled by cutting the low-side jumper on IOTA modules; these channels also have ground-side jumpers in default wiring.
• Use twisted pair, shielded cables for analog signals, and ensure shield drainage is properly handled to avoid ground loop noise.
• Maintain consistent wiring polarity; miswiring differential channels or voltage inputs can degrade accuracy or misread signals.

Commissioning & Calibration

• After wiring, apply calibration sources (e.g. 4 mA, 12 mA, 20 mA) across each channel and validate reading linearity.
• Use the control system diagnostics to verify open-wire detection, bad PV flags, and channel health.
• Monitor PV stability over time to detect drift or noise coupling.
• If fast-loop scanning is used, test whether performance meets control loop demands.

Fault Handling & Replacement

• If a channel misbehaves, check wiring, jumper status, or shielding before suspecting module failure.
• Before replacing the module, record configuration parameters (channel scaling, mode, filters) so you can restore consistent behavior.
• Use a spare module with matching revision or firmware if possible, to avoid mismatch effects.

Environment & Reliability

• Ensure the module operates within temperature and humidity limits specified by the Series-C platform (often –20 to +60 °C, etc.).
• Inspect terminal screws periodically for tightness; vibration or thermal cycles may loosen connections.
• Look for signs of oxidation or corrosion on connectors or wiring over prolonged operation.

Related Modules / Family

Here are some sibling and complementary modules in the Series-C I/O family:

• CC-PAIH01 / CC-PAIH02 — High-Level Analog Input with HART (includes multivariable, HART protocol support)
• CC-PAIN01 — High-Level Analog Input without HART (pure current-mode input)
• CC-PAIM01 / CC-PAIL51 — Low-level analog input modules (RTD, thermocouples) for temperature measurement
• Analog Output / Universal I/O modules in the same family (CC-PAOX01, CC-PUIO01, etc.)