Product Details:

MODICON AS-B872-100 is a four-channel analog current output module belonging to the Modicon 800 series I/O family, originally produced under AEG Modicon. It receives digital setpoint commands from the host CPU over the backplane bus and converts these values into stable 4-20 mA analog current signals to drive field actuators such as control valves, proportional regulators and positioners for closed-loop process control. Each channel can be independently configured and scaled to match engineering units for flow, pressure, temperature and liquid level regulation. It adopts standard rack mounting and plugs directly into the Modicon 800 dedicated backplane. Front panel LED indicators show module ready status, bus activity and channel fault alarms to support fast on-site inspection and troubleshooting. Integrated signal filtering and surge suppression circuits protect analog output lines from electrical noise and transient spikes induced by long field cables in heavy interference factory environments. As an obsolete original spare part, it is used for maintenance and retrofit of legacy Modicon process automation systems. Direct drop-in replacement keeps the existing actuator wiring, channel scaling parameters and rack layout unchanged, removing the need to redesign analog control loops and cutting production downtime.

Basic Parameters

Product type: 4 channel analog current output module

Compatible series: Modicon 800 series

Output signal: 4-20 mA

Channel quantity: 4

Resolution: 12 bit

Installation: rack mount for Modicon 800 backplane

Power supply: powered via backplane bus

Operating temperature: 0°C ~ +60°C

Protection grade: IP20

Supported Functions

Digital to analog conversion for 4-20mA output

Independent channel scaling and configuration

Setpoint transmission to field regulating actuators

Channel fault and overrange detection

Backplane data exchange with host CPU

Output transient and noise suppression

Core Functions

Real-time conversion of digital command to analog current

Stable continuous current drive for process valves

Onboard LED ready and fault indication

Isolation and surge protection for output loops

Diagnostic flag generation for faulty channels

Synchronous data reception from PLC backplane

Hardware Specifications & Environmental Features

Built-in analog loop filtering and surge suppression circuit

Storage temperature: -25°C ~ +70°C

Relative humidity: 5% to 95% non-condensing

Status: Obsolete original part, available for spare replacement

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

Note:Confirm backplane compatibility, loop load requirement and channel scaling configuration before ordering.

This is from our current stock.

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