TOHO TTM-004W-I-AB – Digital Temperature Controller (TTM-000W Series)
Technical Overview

The TOHO TTM-004W-I-AB belongs to the TTM-000W Series of digital temperature controllers, designed for precise heating and cooling applications across a wide range of industries. It integrates self-tuning PID control, multiple input compatibility, and communication functions in a compact 48 × 48 mm package, making it suitable for control panels with limited space.

Engineered for reliability and accuracy, this model supports both thermocouple and RTD inputs, provides a fast sampling time of 250 ms, and ensures seamless integration with industrial automation systems via RS-485 communication (TOHO protocol / Modbus).

Key Features

Self-Tuning PID control for heating and cooling

Multiple Input Support: Thermocouple (K, J, R, T, N, S, B) and RTD (Pt100 / JPt100) selectable from the front panel

High Visibility: Dual 4-digit LED display (PV in white, SV in green)

Fast Response: Sampling cycle of 250 ms

Compact Design: Only 77 mm depth (space-saving installation)

Flexible Outputs: Current output (4–20 mA DC) + Relay contact options for control and alarms

Built-in Safety: EEPROM memory retention and IP66-equivalent protection on the front panel

Communication Ready: RS-485 with TOHO and Modbus protocols

Overshoot Control with PID optimization

Functions Included: Blind function, simplified timer, ramp function, digital PV filter, and CT input with monitoring

Technical Specifications

Manufacturer: TOHO

Series: TTM-000W

Model: TTM-004W-I-AB

Power Supply Voltage: 100–240 VAC

Operating Temperature Range: 0 °C to +50 °C

Input Types: RTD (Pt100, JPt100) / Thermocouple (K, J, R, T, N, S, B)

Display:

PV (Process Value): 4-digit white, 10 mm height

SV (Set Value): 4-digit green, 8 mm height

Outputs:

Control Output 1: 4–20 mA DC

Output Options: Relay contacts for Out2 / EV1 / EV2

Sampling Time: 250 ms

Memory: EEPROM

Power Consumption: 10 VA (264 VAC) / 6 VA (24 VAC) / 4 W (24 VDC)

Enclosure Protection: IP66 equivalent (front panel)

Dimensions (W × H × D): 48 × 48 × 77 mm

Compliance: UL, cUL, CE

Applications

Industrial furnaces and ovens

Plastic molding machines

HVAC temperature control

Food & beverage process equipment

Packaging and sealing machines

Laboratory equipment requiring precision heating/cooling

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