This contact input module captures sixteen dry contact or voltage signals. The Yokogawa ADM51-2 S4 belongs to the Advantum DCS product family. You can connect limit switches, pushbuttons, and relay contacts directly. Its compact design fits standard Advantum I/O racks seamlessly.
Physical Dimensions and Hardware Layout
The Yokogawa ADM51-2 S4 measures 12.5 cm in overall width. Its total depth reaches 15.0 cm including the terminal block. This contact input module weighs approximately 0.45 kg. A metal housing provides excellent shielding against electrical noise. One green LED indicates backplane power status. Additionally, sixteen red LEDs show each channel’s active input state.
Electrical Input Specifications
Each channel accepts dry contact or 24V DC voltage inputs. The Yokogawa ADM51-2 S4 provides a typical input resistance of 4.7 kΩ. Channel turn‑on voltage requires a minimum of 15V DC. Conversely, turn‑off voltage occurs below 5V DC. The module filters input signals to remove contact bounce noise. Two isolated groups share eight channels per common return.
| Parameter | Specification |
|---|---|
| Number of Channels | 16 |
| Input Type | Dry contact or voltage (configurable) |
| Nominal Voltage | 24V DC |
| Input Voltage Range | 0 to 30V DC |
| On‑State Threshold | ≥ 15V DC (or contact closed) |
| Off‑State Threshold | ≤ 5V DC (or contact open) |
| Input Resistance | 4.7 kΩ typical |
| Filter Time (Selectable) | 1 ms, 5 ms, 10 ms, 20 ms |
| Input Delay (Typical) | Filter time + 1 ms |
| Dimensions (W x H x D) | 125 mm x 100 mm x 150 mm |
| Weight | 0.45 kg (0.99 lbs) |
| Terminal Type | Removable 20‑pin screw block |
| Wire Size | 0.2 to 2.5 mm² |
| Number of Terminal Screws | 20 |
| Backplane Current Draw | 160 mA @ 5V DC |
| Power Dissipation | 1.1 W typical |
| Internal Energy Storage | 47 µF capacitor for status retention |
| Isolation Voltage | 1500 Vrms channel‑to‑backplane |
| Contact Wetting Voltage | 24V DC (internal, selectable per group) |
| Number of Components | 1 main board, 2 optocoupler arrays |
| LED Indicators | 1 green (power), 16 red (channels) |
| Operating Temperature | 0°C to +55°C |
Energy Storage and Input Stability
Internal capacitors maintain input status during brief power dips. The Yokogawa ADM51-2 S4 stores channel states for up to 10 ms. This storage prevents false triggering during short interruptions. Consequently, the DCS reads stable input values at all times.
Filtering and Noise Immunity
This module includes selectable input filters for contact bounce rejection. The Yokogawa ADM51-2 S4 rejects voltage spikes shorter than the selected filter time. Choose the 1 ms setting for clean contact signals. Choose the 20 ms setting for noisy field contacts. Therefore, false triggers rarely occur in industrial environments.
Isolation and Channel Configuration
This module groups inputs into two isolated banks of eight channels. Each bank shares a common return terminal. The Yokogawa ADM51-2 S4 provides internal 24V wetting voltage for dry contacts. You can enable or disable the wetting voltage per bank independently. This design accommodates both contact types without external components.
Details
| Weight | 0.7 kg |
|---|---|
| Dimensions | 2.5 × 20.3 × 15.2 mm |
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