Yokogawa ADM51C-2 Contact Output Module

Configured for 16-point discrete signal execution and pulse generation in CENTUM CS 3000 and CENTUM CS 1000 systems, the Yokogawa ADM51C-2 (ADM51C Contact Output Module) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

Hardware Specifications

4-20 mA HART Loop Protocol and Channel Isolation

The module integrates transistor switching circuits with channel-to-channel isolation networks designed to prevent electrical crosstalk across discrete output channels. Operating within CENTUM CS 3000 I/O nodes, the galvanically isolated backplane interface shields internal processing logic from field voltage spikes. High-precision timing circuits allow localized pulse generation from 0.1 to 7200 seconds, maintaining stable operation alongside neighboring analog current loops and HART field buses.

Frequently Asked Questions

Q: What are the voltage and current limits for the transistor contact outputs on the ADM51C-2?

A: The transistor contact outputs are rated for a maximum of 30 VDC at 100 mA or less for both resistive and inductive loads.

Q: Can pulse width timing be processed directly on the ADM51C-2 module?

A: Yes. The onboard timing hardware handles pulse output durations from 0.1 to 7200 seconds with a resolution of 20 milliseconds, relieving host CPU backplane processing load.

Field Installation Guidelines

1. Turn off external 30 VDC field power supplies before seating or removing the module from the node unit slot.
2. Verify that field loads do not exceed the maximum rating of 30 VDC, 100 mA per channel to prevent transistor thermal damage.
3. Ensure single-point earthing for field cabling shields at the terminal board to eliminate ground potential loops.
4. Maintain physical separation between DC discrete output wiring and high-voltage AC cables to minimize electromagnetic coupling.