Bachmann AIO288/1 Analog Input/Output Module
The Bachmann AIO288/1, also cataloged as the AIO288/1 Analog Input/Output Module, operates as a dedicated hardware component for multi-channel analog signal acquisition and voltage control execution within Bachmann M1 Automation System networks.
Suffix Breakdown & Model Matrix
| Part Number | Analog Inputs | Analog Outputs | Pt100/Pt1000 Support | Galvanic Isolation |
|---|---|---|---|---|
| AIO288 | 8 Channels | 8 Channels (+/-10 V) | Up to 4 Sensors | Galvanic Isolation Present |
| AIO288/1 | 8 Channels | 8 Channels (+/-10 V) | Up to 4 Sensors | Non-Isolated (No Galvanic Isolation) |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AIO288/1 |
| Brand | Bachmann |
| Origin | Germany |
| Weight | 0.29 kg (10.2 oz) |
| Dimensions | 58 x 122 x 71 mm |
| Operating Temp | -30 to +60 deg C |
| Power Consumption | 18 to 34 VDC Field Power |
| Analog Inputs | 8 Channels (+/-1 V, +/-10 V, 0-20 mA) |
| Input Resolution / Sampling | 14-bit / 200 us |
| Input Impedance | 100 kOhm (Voltage), 243 Ohm (Current) |
| Temperature Measurement | Up to 4 Pt100/Pt1000 (-100 to +500 deg C) |
| Analog Outputs | 8 Channels (+/-10 V) |
| Output Resolution / Settling | 14-bit / <= 400 us |
| Potentiometer Power Supply | 4 Channels (+/-10 V, Max 40 mA Load) |
| Isolation Voltage | None (AIO288/1 is non-isolated) |
Backplane Bus Communication Velocity & Determinism
The Bachmann AIO288/1 delivers rapid 200 us conversion cycles across all 8 input channels to maintain high backplane bus communication velocity across the M1 controller chassis. Integrated hardware diagnostics continuously scan for cable break occurrences on voltage and temperature loops, while simultaneously monitoring short-circuit conditions on the outputs. Hardware-level firmware flash compatibility ensures that high-speed 14-bit analog data transfers remain fully synchronized with CPU application tasks without generating communication jitter.
Frequently Asked Questions
Q: What is the primary operational difference between the AIO288 and the AIO288/1 variant?
A: The AIO288/1 is a non-isolated version of the standard AIO288. While both share identical channel counts and conversion speeds, the AIO288/1 omits internal galvanic channel isolation and requires external ground loop prevention measures.
Q: How does the module handle temperature measurement using RTD sensors?
A: Up to 4 channels can be configured to read Pt100 or Pt1000 RTD sensors across a range of -100 to +500 deg C using either 2-wire or 4-wire termination topologies.
Field Installation Guidelines
Ensure system and field power supplies are fully disconnected prior to mounting or removing the module from the M1 rack frame. Install the module vertically within the chassis enclosure to facilitate passive thermal dissipation through the ventilation louvers. Because the AIO288/1 does not feature internal galvanic isolation, connect all sensor common leads to a single, equipotential system reference point to eliminate earth potential differences. Run analog signal conductors inside shielded twisted-pair cables, keeping them strictly separated from high-voltage motor or AC distribution lines, and clamp cable shields directly to the cabinet ground plane.
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