Description
The Bachmann DIO232 (Item No. 00012120-00) is a high-density, multifunction digital interface module designed for the Bachmann M1 automation platform. This module features 32 channels that can be individually configured via software to operate either as a digital input or a digital output.
Engineered for high-speed industrial environments such as wind energy control systems, marine automation, and specialized machine building, the DIO232 supports advanced features including input pulse counting, interrupt generation, and pulse-width modulation (PWM) outputs.
Commercial Availability & Procurement Details
- Product Model Options:
- DIO232 (Standard Isolated Variant, Item No. 00012120-00)
- DIO232 CC (ColdClimate Conformal Coated, Item No. 00016155-50)
- Product Condition: New Original (Factory Sealed Surplus) or Refurbished (Fully Bench Tested)
- Warranty Period: 12-Month Comprehensive Warranty
- Worldwide Shipping: 1–3 business days via DHL Express, FedEx, or UPS
- Pricing Notice: Listed pricing is indicative and fluctuates based on global supply chains. Price subject to market conditions; contact our sales team for a firm technical and commercial quote.
Technical Specifications
The table below outlines the electrical parameters, switching characteristics, and environmental boundaries for the DIO232 series.
| Parameter | Value / Technical Specification |
| Total Channels | 32 (Configurable individually as Input or Output) |
| Nominal Operating Voltage | 24 V DC (Acceptable operating range: 18 to 34 V DC) |
| Digital Input Type | Type 1 / Type 3 characteristics according to IEC 61131-2 |
| Input Low Level | < 5 V DC |
| Input High Level | > 15 V DC |
| Input Current / Impedance | 2.3 mA typical at 24 V DC |
| Digital Output Type | High-side semiconductor switch (Source output) |
| Output Current Rating | 0.5 A per channel continuous (Maximum 12 A total per module) |
| Switching Frequency | Up to 10 kHz (Resistive load); up to 100 Hz (Inductive load) |
| Specialized Functions | 2x Counters up to 50 kHz; 2x PWM channels up to 10 kHz |
| Galvanic Isolation | 500 V DC between fieldbus side and backplane logic |
| Current Consumption | 120 mA typical from the M1 internal 5 V DC backplane rail |
Engineering Architecture & Functional Configurations
Dynamic Channel Configuration
The defining characteristic of the DIO232 is its bidirectional versatility. Unlike conventional dedicated I/O blocks, each channel circuit contains both an optocoupled input receiver and a high-side semiconductor driver.
If a channel is set as an output, the logic drives the internal MOSFET to source 24 V DC to the field load. If configured as an input, the output driver remains inactive, and the channel monitors incoming voltage levels against the IEC 61131-2 switching thresholds.
Counter and PWM Subsystems
To reduce processing overhead on the primary M1 CPU, the DIO232 contains dedicated onboard logic processors capable of executing high-frequency hardware functions independently:
- Hardware Counters: Channels 1 and 2 can be mapped as high-speed counter inputs supporting frequencies up to 50 kHz. This allows direct integration of single-channel pulse flowmeters or proximity-based speed sensors.
- Pulse Width Modulation: Channels 17 and 18 can be set up to supply PWM signals up to 10 kHz. This is frequently used for proportional valve control or basic brightness dimming applications.
[ Bachmann M1 Internal Processor Bus ]
|
+-----------------+-----------------+
| DIO232 Internal Logic |
+-----------------+-----------------+
|
(500 V Galvanic Isolation)
|
+-----------------+-----------------+
| 32x Bidirectional Drivers |
+-----------------+-----------------+
|
[ Individual Software Selectable I/O ]
/ \
(Input Mode: 2.3mA Type 3) (Output Mode: 0.5A High-Side)
Field Installation Guidelines
To ensure proper electrical operation and prevent thermal overloading within your enclosure layout, adhere to these guidelines:
- External Power Sourcing: The module requires external 24 V DC to power the output switches. Connect the field supply across the dedicated +V and GND terminal points on the front connector block. Ensure a reverse-biasing diode is placed across any external inductive loads (such as DC relay coils or solenoids) to suppress voltage spikes during turn-off.
- Thermal Management and Current Derating: While each output channel is rated for 0.5 A, the total simultaneous current draw for the entire module cannot exceed 12 A. If multiple channels drive heavy inductive loads concurrently, apply a derating factor based on your ambient temperature inside the cabinet.
- Removable Terminal Coding: Field wiring lands on a removable 40-pin terminal wedge or connector unit. Ensure the mechanical coding blocks match the slot position to prevent high-density accidental cross-connections with adjacent analog or communication modules.
Frequently Asked Questions
What happens if a digital output channel experiences a direct short circuit to ground?
The DIO232 incorporates internal short-circuit and overcurrent protection for every channel driver. If an output detects a fault current exceeding its thermal threshold, the electronic protection circuit trips and disables that specific output path. The module then writes an error flag to the M1 system controller’s diagnostics log. Once the short circuit is corrected and the channel is cycled within the software application, normal operation resumes.
How is the input filter time adjusted for debounce protection?
The digital input debounce filter configuration is managed completely within the Bachmann SolutionCenter engineering utility. The hardware filter can be adjusted from its default value (typically 1 ms to 3 ms) down to lower thresholds for high-speed latching applications, or raised to suppress contact bounce on slow physical mechanical limit switches.
What is the exact purpose of selecting the DIO232 CC version?
The DIO232 CC (ColdClimate) version features an industrial-grade conformal coating across its entire internal printed circuit board (PCB) assembly. This layer isolates the surface components from ambient atmospheric threats like condensing humidity, salt-laden marine air, and sulfurous gasses. The standard version is limited to standard non-condensing environments, whereas the CC module operates reliably in extreme conditions such as those found inside wind turbine nacelles or near-shore installations.
