Product Description

The Yokogawa ADV851-P50 is a hybrid digital I/O module designed for the CENTUM VP Integrated Production Control System. It combines 16 digital inputs and 16 transistor-based outputs in a single FIO slot, providing a compact solution for small-scale automation loops, localized process skids, or machinery groups.

Featuring P50 functionality, the module supports pulse-width modulation (PWM) and time-proportional output control, allowing precise duty-cycle management for devices such as solenoids, heating elements, and dosing pumps. A local pushbutton input is included for manual interventions or diagnostics, while the compact, display-less design maximizes space efficiency in control cabinets. Robust channel isolation ensures protection of the system backplane from field-side electrical transients.

Technical Specifications

Key Features

• Hybrid Efficiency: Integrates 16 inputs and 16 outputs on a single module, reducing slot requirements for paired device applications.

• Time-Proportional Control: Outputs can modulate duty cycles for heaters or dosing pumps via PWM logic.

• Pushbutton Functionality: Detects and counts pushbutton transitions for local manual triggers or low-speed pulse counting.

• Robust Field Isolation: Protects the DCS backplane against voltage surges and electrical noise.

• Flexible Load Support: Handles resistive and inductive loads; external surge protection recommended for high-inductance devices.

Industrial Applications

• Localized Machine Control: Monitoring motor feedback and driving start/stop commands for a single device in one module.

• Process Skids: Small batch or dosing operations where inputs and outputs are tightly coupled.

• Thermal and Dosing Control: Driving solid-state relays for heating or chemical injection with time-proportional outputs.

• Compact Control Cabinets: Optimizing cabinet space in distributed automation setups.

Technical FAQ

Q: When should I use the ADV851 instead of separate ADV151/ADV551 modules?
A: The ADV851 is ideal for paired field devices, like a motor with one status input and one command output, to localize wiring and reduce module count.

Q: What does “Current Sink” output logic mean?
A: The output transistor connects the load to ground. The external 24 V DC power must be applied to the positive side of the load.

Q: Does the module require an external power supply for field circuits?
A: Yes, a 24 V DC supply is needed to power both input loops and output loads.