BACHMANN AO202SI (AO202/SI) – 2‑Channel Isolated Analog Output Module for Precise Current/Voltage Control

If you’re standardizing on the BACHMANN M1 platform and need reliable analog actuation, the AO202SI fits well. It provides two high‑precision analog outputs with electrical isolation, typically selectable per channel for 0/4–20 mA or 0–10 V ranges. From my experience, this model is chosen when you want stable control of drives, valves, and analog actuators without fighting ground loops or noise on long cable runs.

Our Order Placement Process and Guarantees

Key Features

• 2 isolated analog outputs – Typically configurable per channel for 0/4–20 mA or 0–10 V, helping one module serve multiple field devices.
• Channel and bus isolation – Reduces ground loop issues; you might notice cleaner signals in mixed-signal cabinets.
• Industrial-grade precision – 16‑bit class DAC performance is commonly used on this series for stable closed-loop control.
• M1 backplane integration – Seamless with BACHMANN controllers; engineering via SolutionCenter in most cases.
• Rugged operating range – Designed for cabinet environments that typically run from −25 to +60 °C.
• Safe field wiring – Pluggable terminals for quick swaps and clear serviceability.

Technical Specifications

Application Fields

Where this module tends to shine:

• Process control – Driving control valves, dampers, variable‑area flow meters (4–20 mA loops).
• Machine automation – Analog speed/torque commands for VFDs and servo amplifiers (0–10 V).
• Power & renewables – Setpoint control for exciters, inverters, or auxiliary skids in power plants.
• Marine & offshore – Utility subsystems where galvanic isolation helps keep noise at bay.
• Test benches – Repeatable, low‑drift analog setpoints for lab and end‑of‑line stations.

“Swapping to AO202SI stabilized our valve control loops; we shaved minutes off warm‑up and haven’t seen a ground loop alarm since.” — Maintenance Lead, food & beverage OEM

Advantages & Value

• Reliability you can budget for – Isolation and industrial temperature ratings reduce nuisance trips in noisy cabinets.
• Compatibility first – Works natively in BACHMANN M1 racks; no protocol gateways, no guesswork.
• Lower lifecycle cost – One module covers current or voltage outputs, simplifying spares and panel standardization.
• Scalable – Combine with DI/DO and AI modules to keep the same toolchain and spare parts pool.
• Supportable – Documentation and diagnostic transparency usually make commissioning faster for mixed teams.

Installation & Maintenance

• Cabinet environment – Install in a ventilated, dry enclosure; typical panel standard is 24 VDC control power with proper bonding.
• Wiring tips – Use shielded twisted pairs for analog runs; ground shields at one end to limit hum. Keep power and analog separate.
• Loop integrity – For 4–20 mA, verify loop power and burden; check external shunts when converting to voltage.
• Safety – De‑energize field wiring before servicing; confirm isolation before touching neighboring I/O.
• Routine care – Periodically re‑tighten terminals, clean dust with dry air, and review firmware/toolchain updates during planned downtime.
• Recommended companions – Pair with BACHMANN PS200 series power supplies, DI/DO modules (e.g., DI232/DO232), and compatible terminal blocks.

Quality & Certifications

• Certifications: CE; UL (series dependent); RoHS compliant
• Manufacturer policy: Industrial‑grade design and conformity suitable for global deployments
• Warranty: 365 days from delivery