This contact output module provides sixteen fully isolated relay switching channels. The Yokogawa ADM51T belongs to the Advantum DCS product family. You can control solenoids, motors, and alarm indicators across different voltage zones. Per-channel isolation eliminates ground loop problems completely.
Physical Dimensions and Hardware Layout
The Yokogawa ADM51T measures 12.5 cm in overall width. Its total depth reaches 15.0 cm including the terminal block. This contact output module weighs approximately 0.58 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 output state.
Output Specifications and Load Handling
Each output channel uses a Form C (SPDT) electromechanical relay. The Yokogawa ADM51T switches resistive loads up to 2.0A at 250V AC. The relay also handles 2.0A at 30V DC for DC applications. Each relay provides normally open and normally closed contacts. Built‑in snubber circuits protect contacts from inductive load arcing. Every channel has its own isolated common terminal.
| Parameter | Specification |
|---|---|
| Number of Channels | 16 |
| Output Type | Form C relay (SPDT) |
| Contact Configuration | NO and NC contacts per channel |
| Max Load (Resistive AC) | 250V AC, 2.0A |
| Max Load (Resistive DC) | 30V DC, 2.0A |
| Max Load (Inductive AC) | 250V AC, 0.5A |
| Max Load (Inductive DC) | 30V DC, 0.5A |
| Contact Resistance | < 100 mΩ initial |
| Mechanical Life | 10 million operations |
| Electrical Life | 100,000 operations at rated load |
| Operate Time | 10 ms typical |
| Release Time | 5 ms typical |
| Dimensions (W x H x D) | 125 mm x 100 mm x 150 mm |
| Weight | 0.58 kg (1.28 lbs) |
| Terminal Type | Removable 20‑pin screw block |
| Wire Size | 0.2 to 2.5 mm² |
| Number of Terminal Screws | 20 |
| Backplane Current Draw | 300 mA @ 5V DC |
| Power Dissipation | 4.0 W max at full load |
| Internal Energy Storage | 120 µF capacitor for coil hold‑up |
| Isolation Voltage | 1500 Vrms per channel (coil‑to‑contacts) |
| Protection Features | Snubber circuit per channel |
| Number of Components | 1 main board, 16 relays, 16 snubbers |
| LED Indicators | 1 green (power), 16 red (channels) |
| Operating Temperature | 0°C to +55°C |
Energy Storage and Output Behavior
Internal capacitors maintain relay coil power during brief power dips. The Yokogawa ADM51T stores enough energy for 12 ms of hold‑up time. This storage prevents false output resets during short interruptions. All relays de‑energize safely after a power failure longer than 12 ms.
Per-Channel Isolation Benefits
Each output channel has complete electrical isolation from all others. The Yokogawa ADM51T allows each channel to switch different voltage types. You can mix AC and DC loads on the same module safely. This feature eliminates ground loop problems entirely. Therefore, one card serves multiple power zones without extra hardware.
Protection Circuits and Load Compatibility
Snubber circuits across each relay contact reduce inductive arcing. The Yokogawa ADM51T handles AC and DC loads without external suppressors. Use the normally open contact for most switching applications. Use the normally closed contact for fail‑safe functions. Proper fusing protects relay contacts from overload damage.
Details
| Weight | 0.7 kg |
|---|---|
| Dimensions | 2.5 × 20.3 × 15.2 mm |
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