Key Parameters & Specifications:
| Category | Specification |
| ：--- | :--- |
| Function | 16-channel Isolated Digital Input (Contact Input) |
| Input Signal Type | Dry Contact (volt-free contact). The module provides the wetting voltage. |
| Wetting Voltage | 24 V DC (sourced by the module itself) |
| Number of Channels | 16 |
| On/Off Voltage Level | ON (Close): ≤ 5 V DC
OFF (Open): ≥ 15 V DC |
| Input Impedance | Approximately 5.6 kΩ |
| Isolation | Channel-to-Channel Isolation: Yes
Channel-to-Backplane Isolation: Yes |
| Response Time | OFF → ON: Typically 5 ms max.
ON → OFF: Typically 5 ms max. (Configurable via software for noise immunity) |
| Internal Power Consumption | Typically 120 mA @ 5 V (from backplane) |
| Field-Side Power | The module supplies a shared 24V DC sourcing voltage for all input points. |
| Connection Method | The module has a removable front connector that interfaces with a terminal block unit (TBU), which is wired to the field devices. |
| Compatible Systems | • Yokogawa ProSafe-RS (Safety Instrumented System)
• Yokogawa CENTUM VP (Distributed Control System) |
| Mounting | Installed in a dedicated N-IO Node, RIO cabinet, or other compatible Yokogawa rack assemblies. |
| Diagnostics | Built-in diagnostics for module health, communication errors. |
| Status Indicators | Per Channel: LED indicates the ON/OFF state of the input.
Module-Wide: LEDs for module status (RUN, ERR, etc.) and power. |

Typical Application
This module is used to monitor a large number of binary field devices:

Field Devices: Emergency stop buttons, limit switches, level switches, pressure switches, valve position feedback, and motor run-status contacts.

Wiring: Each field contact is wired between the module's common point and an individual input channel.

Operation: When a field contact closes, it allows the module's internal 24V DC wetting current to flow, which the module detects as an "ON" or "1" state.

System Integration: The state of all 16 channels is transmitted digitally to the ProSafe-RS or CENTUM VP controller for logic processing.