Yokogawa YS1700 S2 Programmable Indicating Controller

Overview

The Yokogawa YS1700 S2 is a high-performance programmable indicating controller. It features a full-dot, semi-reflective color LCD for clear visibility in bright environments. The controller supports text-based and function block programming, enabling flexible strategies like single-loop, cascade, and selector control. Dual CPUs and a hard manual circuit ensure high reliability and fail-safe operation, ideal for critical industrial processes.

Technical Specifications

Display

• Full-dot, semi-reflective color LCD.

Programming Methods

• Text-based programming: up to 1000 steps.
• Function block programming: up to 50 modules.

Control Modes

• Single-loop control.
• Cascade control.
• Selector control.

Calculation Capabilities

• IEEE754-format 4-byte floating-point calculations.
• Over 100 modules including exponential, logarithmic, temperature, and pressure compensation.

I/O Configuration

• 8 analog inputs.
• 4 analog outputs.
• Up to 14 digital inputs/outputs (expandable).

Fail-Safe Features

• Dual CPU architecture (control and display).
• Independent hard manual circuit (/NHM option excluded).
• Nonvolatile memory (no battery required).

Power Supply

• AC: 100 V ±10% or DC: 24 V ±10%.
• 220 V AC models: 135 V DC ±10% or 220 V AC ±10%, 50/60 Hz.

Standard Working Conditions

• Ambient temperature: 23°C ±2°C.
• Relative humidity: 50% ±10%.

Accuracy

• I/O conversion: 1–5 V inputs ±0.1% of span.
• Direct inputs: ±0.5% or ±(2 × card accuracy + 0.1%).
• Analog voltage outputs (main): ±0.1% of span.
• Analog voltage outputs (expandable I/O): ±0.2% of span.
• Analog current outputs: ±0.2% of span.

Allowable Input Voltage

• 1–5 V, mV, or TC direct input.
• Two-wire transmitter: –0.5 to 4 V DC, ±40 mA DC.