YOKOGAWA YS1500 | YS1000 Indicating PID Controller

Description

• Model: YS1500
• Brand: Yokogawa Electric Corporation
• Series: YS1000
• Core Function: Performs PID and cascade process control
• Type: Indicating controller
• Key Specs: 100 ms control period; 4 analog inputs; 2 × 1–5 V and 1 × 4–20 mA analog outputs
• Communication: Ethernet Modbus/TCP and RS-485 options
• Condition: New Original (New Surplus) or legacy stock, subject to supplier inventory

Product Introduction

Four analog inputs, three standard analog outputs, and a 100 ms control period put the YOKOGAWA YS1500 squarely in the process-control category. It is an indicating controller in the YS1000 family, with PID, single-loop, cascade, and auto-selector functions built into the platform. Yokogawa also offers configuration options for Ethernet Modbus/TCP, RS-485, DCS-LCS communication, and direct sensor inputs.

For maintenance teams, the useful point is flexibility without moving to a full PLC or DCS controller. The basic model provides four 1–5 V analog inputs, two 1–5 V analog outputs plus one 4–20 mA output, six configurable contact I/O points, and a fail-contact output. The 100 ms control period is fixed for the YS1500 basic type, so this is better suited to conventional process loops than applications needing the faster 50 ms cycle available on the YS1700.

Key Technical Specifications

Yokogawa’s published YS1000 technical material lists the 100 ms control period, four analog inputs, three analog outputs, six contact I/O points, self-tuning, Ethernet Modbus/TCP and RS-485 options, and the 72 × 144 mm front-panel size.

YOKOGAWA YS1500

Key Features and Practical Value

• 100 ms control cycle for conventional industrial process loops.
• Built-in PID control with single-loop, cascade, and selector modes.
• Four standard analog inputs for voltage-based process signals.
• Three analog output channels on the basic configuration.
• Six configurable contact I/O points.
• Self-tuning function for supported process applications.
• Ethernet Modbus/TCP available through the appropriate option.
• Direct-input cards support thermocouple, RTD, frequency, transmitter, and other signal types depending on model code.

The controller also uses nonvolatile memory for backup, so the published YS1000 architecture does not rely on a conventional backup battery for stored control data.

Typical Applications

The YS1500 fits well in:

• Boiler and utility control
• Temperature and pressure loops
• Flow and level regulation
• Skid-mounted process equipment
• Chemical dosing systems
• Pump and compressor auxiliaries
• Legacy panel-controller replacement

It is especially useful where the plant needs a dedicated process controller with clear front-panel operation but does not need a full PLC rack. Yokogawa also offers YS1500 versions with mechanical compatibility for earlier controller families, which can simplify panel replacement projects.

Related Models

YS1700 — Programmable indicating controller in the same YS1000 family. It adds programmable functions and can support faster 50 ms control periods, making it more suitable for applications that need embedded calculation or sequence logic.

YS1300 — Related YS1000-series controller for applications with different input and control requirements.

YS100 Series — Earlier Yokogawa controller family. YS1500 compatible versions are available with case and panel arrangements intended to simplify replacement of older instruments.

YS1360 — Manual Station for MV Setting within the YS1000 family, intended for manual manipulation and output-setting functions rather than full PID control.

Installation and Maintenance

Do not order from “YS1500” alone.

The complete model code determines the power supply, direct-input card, communication interface, certification, and other options. Yokogawa’s ordering structure includes options such as /A01–/A08 for direct inputs, /A31 for RS-485, and /A34 for Ethernet Modbus/TCP.

Before removal, photograph the rear terminals and record the complete nameplate code. Back up PID settings, setpoints, alarm parameters, communication addresses, and scaling values.

After installation, verify the supply voltage, PV reading, output scaling, contact I/O, communication link, and control action. For a running process, commission the loop in manual mode before enabling automatic control.

Quality Inspection and Test Procedure

For New Original, surplus, used, or refurbished stock, keep inspection records with the unit.

1. Inbound inspection

• Verify part number and serial number.
• Check the front display, housing, terminals, and mounting hardware.
• Inspect for corrosion, impact marks, or previous repair evidence.
• Confirm included accessories and documentation.

2. Live Test

Use a compatible Yokogawa YS1000 test setup.

• Power-up and display verification
• Analog input simulation
• Analog output verification
• Digital input/output testing where fitted
• RS-485 or Ethernet communication test where equipped
• PID response check
• Extended powered operation where practical
• Test Report generation

3. Electrical testing

Verify supply input and grounding continuity according to Yokogawa procedures. Insulation or withstand testing should only be performed when permitted by the applicable manual.

4. Program and configuration verification

Record the hardware configuration and available software information. Preserve the original parameter set and communication settings where possible.

5. Final QC

Apply QC approval, antistatic protection, cushioning, rigid carton packaging, and a dated inspection label. Test photos or video can be supplied with the shipment record.

Technical Replacement Pitfalls

Option-code mismatch: Two units labeled YS1500 can have different communication or input options. Check the full code.

Wrong sensor input: A thermocouple version is not automatically interchangeable with a transmitter-input configuration. Verify the direct-input option.

Communication mismatch: Ethernet Modbus/TCP and RS-485 are selectable options, not assumptions.

Power-supply mismatch: The 100 V system and 220 V system use different input ranges. Confirm the power-supply code before energizing the replacement.

Panel compatibility: The standard front dimensions are 72 × 144 mm, but replacement variants may be intended for earlier YS100 or YS80 panel arrangements. Check the mechanical code before shipment.

Configuration loss: A replacement unit may need the original PID and communication parameters restored. Save them first.

Procurement Guidance

For international MRO procurement, specify the complete YOKOGAWA YS1500 ordering code, not just the family name. Include condition, test status, warranty, country of origin, lead time, and Incoterms on the quotation.

For customs paperwork, a functional description such as “industrial process indicating controller” is more useful than “electronic board.” The applicable HS classification should still be confirmed against the actual configuration and destination-country requirements.

Quick Conclusion

• YS1500 is a Yokogawa YS1000-series indicating controller for PID process control.
• The basic type provides 4 analog inputs and 3 analog outputs, with a 100 ms control period.
• Ethernet Modbus/TCP and RS-485 are available through specified option codes.
• Direct-input options cover signals such as thermocouple, RTD, transmitter, and frequency inputs.
• For replacement purchasing, the complete suffix and option code are essential. “YS1500” by itself is not enough to guarantee compatibility.