PXC100E.D SIEMENS Digital input module

Description

PXC100E.D SIEMENS Digital input module

Product Dimensions：

Product Description

The Digital Input Module is an electronic assembly that forms the bridge between the physical world of discrete states (ON/OFF, 1/0, True/False) and the digital processing logic of the PLC. It receives voltage signals from field devices, isolates them electrically from the sensitive internal logic, conditions them, and converts them into the binary digital format that the PLC can read.

DI Modules are categorized primarily by the type of power source they connect to (AC or DC) and the method of wiring (sinking or sourcing, or single-ended/differential). They typically feature multiple channels (inputs) per module, allowing efficient wiring density. Modern modules often include advanced features like integrated diagnostics, time stamping, and configurable filtering.

Product Parameters

General functional and electrical parameters for DI Modules include:

• Number of Channels: The total count of inputs available on the module (e.g., 8, 16, 32 channels).

• Nominal Input Voltage: The standard operating voltage the module expects to receive (e.g., $24 text{V DC}$, $120 text{V AC}$).

• Input Type: Specifies the wiring method:

  • Sinking/Sourcing (DC): Defines whether the module provides the source current (Sourcing) or accepts the return current path (Sinking).

  • AC/DC: Identifies the nature of the accepted signal.

• Input Delay (Filter Time): The configurable time setting (e.g., $0.1 text{ms}$ to $20 text{ms}$) used to suppress contact bounce or electrical noise, ensuring stable signal readings.

• Input Current (Threshold): The minimum current required for the module to reliably register a logic ‘1’ (ON) state.

• Isolation: Specifies the electrical isolation between the field connections, the backplane bus, and groups of channels.

Product Advantages

1. Noise Suppression and Reliability: Modules feature integrated digital filters and high electrical isolation, ensuring that noisy field signals are reliably converted into clean digital inputs for the CPU.

2. High Channel Density: Modern designs allow for a large number of inputs in a compact physical footprint, minimizing panel space and reducing overall system size.

3. Comprehensive Diagnostics: Advanced modules offer channel-specific diagnostics, such as short-circuit detection, wire break monitoring, and supply voltage monitoring, simplifying troubleshooting and reducing maintenance time.

4. Flexible Wiring Options: Availability of modules supporting various voltage levels and sinking/sourcing configurations allows integration with almost any type of external sensor or device.

5. Time Stamping (High-Speed): Specialized modules offer features to time stamp signal changes with high precision, essential for sequence-of-events recording and high-speed control applications.

Notes (Important Considerations)

• Wiring Standard: Always ensure that the selected module’s input type (sinking or sourcing) is compatible with the output type of the connected field device (sensor or switch).

• Voltage Rating: Verify that the nominal input voltage of the module exactly matches the voltage of the field device to avoid damage or unreliable operation.

• Channel Grouping: Be aware of the grouping of inputs on the module, as multiple channels often share a common power potential or fuse protection.

• Filter Configuration: The input filter time must be set correctly. A filter time that is too short may allow noise to cause false signals, while a time that is too long may delay critical inputs.

• Shielding and Grounding: Proper cable shielding and grounding practices are necessary to minimize electromagnetic interference (EMI) on the input lines, especially in noisy industrial environments.

Product Applications

Digital Input Modules are fundamental to controlling and monitoring virtually all industrial equipment:

• Basic Machine Control: Monitoring the state of limit switches, emergency stop buttons, selector switches, and proximity sensors on conveyors, presses, and assembly lines.

• Safety Systems Integration: Reading signals from light curtains, safety interlocks, and safety mats (requires specialized safety-rated DI modules for functional safety).

• Process Monitoring: Reading the status of simple valves (open/closed), circuit breaker positions, and level switches in tanks and silos.

• Material Handling: Detecting the presence or absence of workpieces using optical or magnetic sensors.

• System Interlocks: Monitoring feedback signals from motor contactors and protective relays to verify machine states.

Shipping Port: Xiamen, China

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