The Yokogawa ADM52-2 S4 measures 12.5 cm in overall width. Its total depth reaches 15.0 cm including the terminal blocks. This digital input module weighs approximately 0.52 kg. A metal housing provides excellent shielding against electrical noise. One green LED indicates backplane power status. Two LED bars display input status for all channels efficiently.
Electrical Input Specifications
Each input channel operates at 24V DC nominal voltage. The Yokogawa ADM52-2 S4 provides a typical input resistance of 3.9 kΩ. Channel turn‑on voltage requires a minimum of 19V DC. Conversely, turn‑off voltage occurs below 9V DC. Built‑in optical isolation protects the backplane from field wiring faults. The module divides inputs into four isolated groups of eight channels.
| Parameter | Specification |
|---|---|
| Number of Channels | 32 |
| Input Type | Sink (NPN) or source (PNP) configurable per group |
| Nominal Voltage | 24V DC |
| Input Voltage Range | 19.2V to 28.8V DC |
| On‑State Threshold | ≥ 19V DC |
| Off‑State Threshold | ≤ 9V DC |
| Input Resistance | 3.9 kΩ typical |
| Input Delay (On→Off) | 2 ms typical |
| Input Delay (Off→On) | 2 ms typical |
| Dimensions (W x H x D) | 125 mm x 100 mm x 150 mm |
| Weight | 0.52 kg (1.15 lbs) |
| Terminal Type | Two removable 20‑pin screw blocks |
| Wire Size | 0.2 to 2.5 mm² |
| Number of Terminal Screws | 40 |
| Backplane Current Draw | 220 mA @ 5V DC |
| Power Dissipation | 1.8 W typical |
| Internal Energy Storage | 100 µF capacitor for status retention |
| Isolation Voltage | 1500 Vrms groups‑to‑backplane |
| Common Mode Rejection | 60 dB at 50/60 Hz |
| Number of Components | 1 main board, 2 terminal blocks, 4 optocoupler arrays |
| LED Indicators | 1 green (power), 32 yellow (channels) |
| Operating Temperature | -10°C to +60°C |
Energy Storage and Input Stability
Internal capacitors maintain input status during brief power dips. The Yokogawa ADM52-2 S4 stores channel states for up to 12 ms. This storage prevents false triggering during short interruptions. Consequently, the DCS reads stable input values at all times.
Noise Immunity and Filtering
This module includes hardware filters for electrical noise rejection. The Yokogawa ADM52-2 S4 rejects voltage spikes shorter than 1 ms. The input delay includes the filter time automatically. Therefore, false triggers rarely occur in noisy industrial environments.
Isolation and Channel Grouping
This module groups inputs into four isolated banks of eight channels. Each bank shares a common return terminal. The Yokogawa ADM52-2 S4 allows different commons per bank independently. You can connect sensors from different power zones to one module. This design simplifies wiring in complex control systems.
Wiring and Installation Guidelines
Connect field devices to the two removable 20‑pin screw terminal blocks. The Yokogawa ADM52-2 S4 accepts solid or stranded wires from 0.2 to 2.5 mm². Connect the common return for each input bank separately. Proper grounding reduces electrical noise significantly. Label each wire clearly for future maintenance.
Details
| Weight | 0.7 kg |
|---|---|
| Dimensions | 2.5 × 20.3 × 15.2 mm |
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