Technical Overview

The ADV859 is a hybrid digital I/O module designed for the Yokogawa CENTUM-ST2 control environment. It combines 16 digital inputs and 16 digital outputs in a single module, enabling localized bidirectional control while minimizing I/O slot usage.

With robust electrical isolation and support for both contact and voltage inputs, the ADV859 is well suited for applications requiring tight coupling of sensing and actuation, while protecting the system backplane from electrical noise and field-side disturbances.

Detailed Technical Specifications

Operational Applications

The ADV859 is ideal for applications where balanced input/output density is required at the field interface, including:

• Skid-mounted equipment control (sensors + valves in one module)

• Interlock logic combining switch monitoring and solenoid actuation

• Time-proportional control of heaters or dosing pumps (with /P option)

• Corrosive environments such as wastewater or pulp & paper plants (with /G3 option)

Technical FAQ

Can the ADV859 drive high-current loads directly?
No. Each output is rated at 100 mA, 30 V DC. High-current devices such as motors or large heaters must be driven via interposing relays or SSRs.

What is the purpose of the /G3 option?
The /G3 option applies an ISA G3-compliant conformal coating, protecting the PCB against corrosive gases such as sulfur and chlorine, commonly found in wastewater and chemical processing facilities.

Are pulse width functions available by default?
No. Pulse width and time-proportional control are only enabled when the module is ordered with the /P option (ADV859/P).