Product Overview

The Yokogawa YS170-012 S4 is a sophisticated single-loop programmable controller engineered for high-precision regulation in industrial process environments. Part of the renowned YS100 series, this unit combines the functionality of a PID controller with programmable logic capabilities, allowing users to implement custom control strategies for pressure, flow, temperature, and level applications.

The YS170-012 S4 is designed for high reliability and ease of use, featuring a clear display for real-time monitoring of process variables (PV), set points (SV), and manipulated variables (MV). It is widely utilized as a standalone controller or integrated into larger Distributed Control Systems (DCS) via optional communication interfaces. Its robust architecture ensures stable operation in demanding sectors such as chemical processing, water treatment, and power generation.

Technical Specifications

• Manufacturer: Yokogawa

• Model Number: YS170-012 S4

• Device Type: Single-Loop Programmable Controller

• Input Signals: 1 to 5 V DC, 4 to 20 mA DC, or direct input (Thermocouple/RTD)

• Output Signals: 4 to 20 mA DC or 1 to 5 V DC

• Control Modes: PID control, Sample-and-hold PI control, Batch PID control

• Programming: Supports Function Block programming for custom logic

• Communication: Optional RS-485 or DCS-LCS support

• Power Supply: 100-120 V AC or 220-240 V AC (model dependent)

• Operating Temperature: 0 to 50°C

• Dimensions: 7.0 cm x 14.5 cm x 29.3 cm

• Weight: 2.05 kg

• Origin: Japan

Key Technical Characteristics

• Dual-CPU Architecture: Utilizes a dedicated control CPU and a display CPU to ensure that control functions continue uninterrupted even if the display interface encounters a fault, enhancing plant safety.

• Flexible Logic Programming: Beyond standard PID loops, the YS170 allows for the creation of complex calculations and sequence control using intuitive function blocks, adapting to unique process requirements.

• Non-Volatile Memory Protection: Program and configuration data are stored in EEPROM, eliminating the need for battery backups and ensuring immediate recovery following a power disruption.

• High-Visibility Display: Features a dual-display system (analog bar graph and digital readout) providing operators with immediate visual feedback on process status and deviation.

• Fail-Safe Manual Control: Includes a hard-manual station that allows operators to maintain control of the process output directly in the event of a main electronics failure.

• Simplified Maintenance: The modular internal design permits the main unit to be withdrawn from the case for inspection or replacement without disturbing the field wiring.