Yokogawa UT55A-001-11-00 Digital Indicating Controller
A standard-control UT55A execution with universal process input, ladder sequence functions and a dedicated RS-485 network interface.
Overview
UT55A-001-11-00 is a Yokogawa UTAdvanced 1/4 DIN digital indicating controller. The 001 function code identifies standard basic control, no added Type 2 I/O package and the Type 3 RS-485 communication selection.
Its universal process input, color LCD, control functions and embedded ladder sequence capability support panel-based temperature and process loops. The complete UT55A-001-11-00 suffix must remain visible because closely related UT55A codes change I/O and network hardware.
Specs
| Manufacturer | Yokogawa Electric Corporation |
|---|---|
| Model | UT55A-001-11-00 |
| Series | UTAdvanced |
| Product Type | Digital indicating controller |
| Panel Size | 1/4 DIN; 96 × 96 mm front |
| Basic Control Code | -0 standard type |
| Type 2 Function Code | 0; no additional Type 2 I/O package |
| Type 3 Network Code | 1; RS-485 communication |
| RS-485 Interface | EIA RS-485, two-wire or four-wire half duplex |
| RS-485 Baud Rates | 600 to 38,400 bps for the Type 3 interface |
| Maximum RS-485 Distance | 1,200 m under the specified wiring conditions |
| Process Input | Universal thermocouple, RTD, mV, V or mA input |
| Measurement Accuracy | ±0.1% of full scale for the stated standard conditions |
| Control Cycle | 50, 100 or 200 ms |
| Display | Two five-digit, 14-segment color LCD displays with bar graph |
| Standard Digital I/O | 3 digital inputs and 3 digital outputs |
| Power Supply | 100 to 240 VAC, +10% / -15% |
| Maximum Power Consumption | 18 VA |
| Front Protection | IP66; NEMA 4 water-test basis |
Features
Color-changing process-value display and readable alphanumeric guidance.
Universal input supports multiple temperature and process signal families.
RS-485 connection supports controller integration without adding an external gateway.
Ladder sequence function is included for interlocks and local logic.
Applications
- Temperature and process loops requiring a 96 × 96 mm panel controller.
- RS-485 supervisory links carrying process value, setpoint, output and alarm data.
- Skids and legacy panels where local display, PID control and discrete interlocks share one controller.
Lifecycle
- Export the parameter map and record input range, control mode, PID values, alarms and ladder sequence before removal.
- Capture RS-485 address, baud rate, parity, protocol, two- or four-wire topology and termination.
- Confirm the complete UT55A-001-11-00 suffix and power supply before moving field conductors.
- After replacement, test sensor scaling, control direction, outputs, alarms, communications and safety interlocks under an approved startup plan.
FAQ
Why can a UT55A-001-11-00 communicate intermittently after replacement?
A mismatched address, baud rate, parity, protocol, wire mode or termination can pass occasional traffic yet remain unstable; compare every serial setting with the saved network record.
What should be photographed before ordering UT55A-001-11-00?
Capture the complete side label, terminal wiring, panel cutout, supply terminals and the RS-485 conductors so the suffix and installation are independently verifiable.
Can another UT55A code replace UT55A-001-11-00?
Only after its basic-control, added-I/O and network codes are compared. Similar fronts can hide different terminal and communication hardware.
Which backup is most useful before changing UT55A-001-11-00?
Retain the full parameter map, ladder sequence, calibration-related settings, display assignments and serial communication setup.
What proves a successful UT55A-001-11-00 commissioning?
Record stable measured value, correct output direction, alarm and interlock tests, setpoint response and error-free RS-485 polling.
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