Product Details

Modicon AS-B884-002 is a professional pid loop module and high-performance process control card belonging to the Modicon 800 / 984 series rack system. This intelligent io module supports two independent PID control loops and integrates rich analog and discrete I/O resources to realise closed-loop regulation for temperature, pressure, flow and liquid level without heavy reliance on the main CPU. It accepts analog signals from transmitters and thermocouples, executes P, PI, PD and PID algorithms, and outputs regulating signals to valves and actuators. As a discontinued legacy spare, this pid loop module is widely used for retrofit and replacement in ageing process plants, and this process control card helps stabilise continuous production by restoring automatic closed-loop control.

Basic Parameters

Brand: Modicon

Model: AS-B884-002

Product Type: 2-Loop PID Intelligent I/O Module

Compatible Series: Modicon 800 series backplane, 984 racks

Power Supply: 24 VDC

Control Loops: 2 independent PID loops

Analog Inputs: 4 channels (4–20 mA, 1–5 VDC, 0–10 VDC)

Thermocouple Inputs: 2 channels

Analog Outputs: 2 channels

Discrete I/O: 2 discrete inputs, 2 discrete outputs, 1 pulse input

Rejection Ratio: 60 dB normal mode, 90 dB common mode

Mounting: Standard rack slot mounting

Product Status: Discontinued legacy spare

Net Weight: Approximately 1.59 kg

Supported Functions

This pid loop module supports independent PID parameter configuration, auto-tuning, setpoint adjustment and closed-loop holding. The process control card performs real-time signal sampling, engineering conversion and fault detection for broken transmitters and out-of-range signals. This intelligent io module can run control loops autonomously, upload process variables and alarm information to the host PLC, and supports parameter backup and restoration for fast commissioning after replacement.

Core Functions

As a dedicated process control card, this pid loop module executes closed-loop regulation for process variables and outputs corrective signals to field regulating devices. It offloads heavy loop calculation tasks from the main processor and maintains stable control even during brief bus fluctuations. This intelligent io module serves as a drop-in replacement to recover automatic PID regulation for old Modicon automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Compact industrial metal module shell

Protection: Built-in signal over-range detection

Anti-interference: High common-mode rejection for noisy field wiring

Compatibility: Matches 800 series backplane and compatible peripheral modules

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note: Confirm 800 series backplane compatibility, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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