BACHMANN SDI208 Safety Digital Input Module
The BACHMANN SDI208, also cataloged as the SDI208 Safety Digital Input Module, operates as a dedicated hardware component for digital signal acquisition and field device monitoring within Bachmann M1 Automation System platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | SDI208 (Item No. 00014544-00) |
| Brand | BACHMANN |
| Origin | Austria |
| Weight | 0.25 kg |
| Dimensions | 110 mm x 25 mm x 119 mm |
| Operating Temp | -30 deg C to +60 deg C |
| Power Consumption | Powered via 18 VDC to 34 VDC backplane supply |
| Input Channels | 8 digital inputs (SIL3 / PL e / Cat 4 compliant) |
| Input Voltage (High) | 15 VDC to 34 VDC |
| Input Voltage (Low) | 0 VDC to 5 VDC |
| Input Filter | 600 us (typical) |
| Internal Resistance | 6.8 k-ohm |
| Interrupt Inputs | 1 configurable interrupt input |
| System Isolation | 500 V galvanic isolation between field and logic |
| Status Indication | 1 green status LED per input channel |
Deterministic Network Scaling & Safety Bus Synchronization
The module transfers field input states directly across the backplane bus communication velocity Licences network structure, enabling tight cycle synchronization with the central SLC284 safety processor module. Distributed layout configurations allow engineers to position the input card locally in the M1 rack or over extended distances via FASTBUS optical interfaces. High-density I/O density scaling expands system capability while maintaining deterministic response times and full IEC 61508 safety integrity. Hardware-level diagnostic routines continually verify cross-channel functional states to preserve firmware flash compatibility across backplane processing nodes.
Frequently Asked Questions
Q: What safety integrity level certifications govern the inputs on this module?
A: The input channels comply with IEC 61508 SIL3, EN ISO 13849-1 PL e, and Category 4 structural requirements for safety-critical field signal evaluation.
Q: How does the module handle signal noise and switch contact bounce on inputs?
A: An integrated hardware input filter applies a 600 us typical time delay to incoming signals to prevent transient noise spikes from generating false logic trips.
Q: Can input channel values be accessed outside the dedicated safety code execution space?
A: Process values and state variables mirror directly into standard PLC application languages (PLC, C/C++) and HMI visualization systems without requiring separate parallel wiring loops.
Field Installation Guidelines
Mount the module on the standard M1 backplane rail inside an IP54-rated control enclosure. De-energize all 24 VDC power feeds supplying the rack prior to inserting or removing the card to protect backplane connector contacts. Wire field devices such as emergency stop switches, light curtains, and safety interlocks using shielded twisted-pair cables. Terminate cable drain wires directly at the functional earth (FE) bus bar using low-impedance grounding clamps, ensuring physical separation between safety signal leads and high-voltage power conduits.
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| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
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