---
title: "Digital Input Module"
industry: "Machinery and Equipment Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:DIGITAL_INPUT_MODULE"
  data_integrity_hash: "94d223a52072323f472716adff40508b"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:DIGITAL_INPUT_MODULE"
  data_source_uri: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/digital-input-module.md"
  official_resource_url: "https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/digital-input-module"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-24 VDC input voltage, 0-100 mA input current, -20°C to +70°C ambient temperature"
    unit: "channels"
engineering_limits:
  max_safe_operating_point:
    value: 30
    unit: "VDC"
    consequence: "Semiconductor junction breakdown due to reverse bias voltage exceeding 30 VDC (avalanche breakdown), copper trace melting at 150 mA due to Joule heating (P=I²R), optocoupler LED degradation above 85°C due to Arrhenius equation acceleration (failure rate doubles per 10°C rise)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Electrostatic discharge (ESD) event exceeding 8 kV human body model"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Integrated TVS diodes with 5 ns response time and 600 W peak pulse power rating"
  - node_2:
      trigger: "Continuous common-mode voltage exceeding 60 VDC between channels"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Reinforced isolation design with 5 mm creepage distance and 8 mm clearance distance per IEC 61131-2"
bom_nodes:
  terminal-block:
    type: "part"
    urn: "URN:CNFX:ME:TERMINAL_BLOCK"
    interface_type: "physical-logic-coupled"
  optocoupler:
    type: "part"
    urn: "URN:CNFX:ME:OPTOCOUPLER"
    interface_type: "physical-logic-coupled"
  status-leds:
    type: "component"
    urn: "URN:CNFX:ME:STATUS_LEDS"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
url: "https://cnfx.com/llms/industry/machinery-and-equipment-manufacturing/product/digital-input-module.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "6f398eb1821b8b438db3f9fa81c2fcccaba89697a56b269e5ee354b47921c157"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Digital Input Module

## 1. Technical Definition
A hardware component that receives and processes digital signals from field devices for a PLC system.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-24 VDC input voltage, 0-100 mA input current, -20°C to +70°C ambient temperature**. Failure boundary: **Input voltage exceeding 30 VDC causes semiconductor junction breakdown, input current exceeding 150 mA causes trace melting, ambient temperature exceeding 85°C causes thermal runaway in optocouplers**, Mechanism: **Semiconductor junction breakdown due to reverse bias voltage exceeding 30 VDC (avalanche breakdown), copper trace melting at 150 mA due to Joule heating (P=I²R), optocoupler LED degradation above 85°C due to Arrhenius equation acceleration (failure rate doubles per 10°C rise)**.

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Electrostatic discharge (ESD) event exceeding 8 kV human body model | 8 | Gate oxide rupture in input protection MOSFETs | Integrated TVS diodes with 5 ns response time and 600 W peak pulse power rating |
| Continuous common-mode voltage exceeding 60 VDC between channels | 8 | Optocoupler isolation barrier breakdown | Reinforced isolation design with 5 mm creepage distance and 8 mm clearance distance per IEC 61131-2 |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | channels | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Terminal Block](https://cnfx.com/llms/industry/electrical-equipment-manufacturing/product/terminal-block.md) `(Standalone System)`
- [Optocoupler](https://cnfx.com/llms/industry/computer-electronic-and-optical-product-manufacturing/product/optocoupler.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Programmable Logic Controller (PLC)**, **Power Supply Unit**, **Signal Conditioning Unit**  
**Downstream Applications**: Automated Assembly Lines, Packaging Machinery, Industrial Robots  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the primary function of this digital input module in machinery manufacturing?
**A**: This module receives and processes digital signals from field devices like sensors and switches, converting them into signals compatible with PLC systems for industrial automation control.

### Q: How does the optocoupler in the BOM enhance module reliability?
**A**: The optocoupler provides electrical isolation between field devices and the PLC system, protecting sensitive electronics from voltage spikes, noise, and ground loops in industrial environments.

### Q: What advantages does the FR-4 PCB material offer for this industrial component?
**A**: FR-4 PCB provides excellent thermal resistance, mechanical strength, and electrical insulation, ensuring durability and stable performance in demanding machinery manufacturing environments.

## 6. Manufacturing Compliance

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### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Digital Input Module](https://cnfx.com/industry/machinery-and-equipment-manufacturing/product/digital-input-module)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **3** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: DIGITAL_INPUT_MODULE | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: bd25d804
