Honeywell UDC3500 1/4 DIN Digital Single or Dual Loop Digital Controller
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1/4 DIN digital single or dual loop (cascade) controller, three universal low level inputs for thermocouples, RTDs, linear current and voltage, NEMA 4X/IP66 front-face, two-line digital display for process variable and setpoint, real-time clock, eight-segment characterizer, totalizer
Honeywell’s UDC3500 universal digital loop controller introduces new features in the popular 1/4 DIN size while retaining the reliability, cost-effectiveness, simplicity, and popular interface of Honeywell's retired UDC3300 enhanced controller. The UDC3500 adds infrared communications for programming the controller, thermocouple health drift alarming, Modbus RTU over RS-485 or Ethernet communication options, Accutune III advanced tuning with fuzzy overshoot control, and more.
Available as a single loop or dual loop controller, the waterproof NEMA 4X/IP66 faceplate makes the UDC3500 suitable for use in wash-down applications. It's a direct drop-in upgrade to Honeywell's retired UDC330E models or as a functional replacement for UDC5000 models.
During normal operation, the UDC3500's upper display is dedicated to the process variable, and the lower display shows key operating parameters (output, setpoints, inputs, deviation, tuning parameter set, timer status, or minutes remaining in a setpoint ramp). Other indicators on the display show alarm, control mode, temperature unit indication, status of control relays, whether setpoint program is in run or hold mode.
- Three universal analog inputs for thermocouple, RTD, mA, mV, or voltage, sampled 6 times per second; Can be configured as one universal plus four high level inputs
- Accuracy ±0.1% full scale input, typical resolution 16 bits
- Up to three analog outputs, five digital outputs, four digital inputs
- Up to four electromechanical alarm relays to activate external equipment: latching or non-latching, PV rate of change, loop break, diagnostic alarms and timer output reset
- Accutune, math functions, heat break alarms, and thermocouple health diagnostics
- Basic and enhanced setpoint programming: Up to 4 programs, 20 segments each
- Optional RS485 Modbus RTU or Ethernet communications
- PID or On/Off, heat/cool, ratio, position proportional, actuator three-position step control, carbon potential/dewpoint/O2, or feed-forward control modes. Cascade control in dual loop model
- Optional real-time clock to start/stop setpoint programmer
- Optional totalizer
- CE, UL, CSA approvals available
- Each UDC3500 comes with mounting brackets, four screws for the NEMA 4 faceplate, and a printed quick-start guide
Model Selection Guide
Use this table to find the right model for your application. Not all options are available on all models. See the latest specification datasheet under the Product Literature tab for complete details.
| Description | Model Number | |
|---|---|---|
| Power | 1/4 DIN Digital Controller, Current Output #1, for 90-264 VAC Power 1 4 DIN Digital Controller, Current Output #1 for 24 VAC/VDC Power | DC3500- DC3501- |
| Output #2 | None Current Output — 0/4-20 mA 5 Amp Form C Electromechanical Relay 1 Amp Solid State Relay Open Collector Transistor Output Two 2 Amp Form A Relays for Heat/Cool Applications | 0 _ - C _- E _- A _- T _- R _- |
| Relay Outputs #3, #4, and #5 | None Three 5 Amp Form C Electromechanical Relays | _ 0- _ E- |
| Communications | None 1 Auxiliary Output and 1 or 2 Digital Inputs RS-485 Modbus plus Aux Out/DI Ethernet (Modbus RTU) plus Aux Out/DI | 0 _ _ _ - 1 _ _ _ - 2 _ _ _ - 3 _ _ _ - |
| Software | Standard Functions
(Includes Accutune) Math Option Setpoint Programming (1 Program, 20 Segments) Setpoint Programming plus Math HealthWatch Setpoint Programming and HealthWatch Math Option and HealthWatch Setpoint Programming, Math, and HealthWatch Enhanced Setpoint Programming (4 Programs, 20 Segments Each) Enhanced Setpoint Programming plus Math Enhanced Setpoint Programming plus HealthWatch Enhanced Setpoint Programming, HealthWatch, and Math | _ 0 _ _ - _ A _ _ - _ B _ _ - _ C _ _ - _ D _ _ - _ E _ _ - _ F _ _ - _ G _ _ - _ H _ _ - _ J _ _ - _ K _ _ - _ L _ _ - |
| Loops of Control | Single Loop Two Loops plus Internal Cascade | _ _ 0 _- _ _ 2 _- |
| Real-Time Clock | None Real-Time Clock | _ _ _ 0- _ _ _ C- |
| Input #1 | Thermocouple, RTD, mV, 0-5 VDC, 1-5 VDC Thermocouple, RTD, mV, 0-5 V, 1-5 V, 0-20 mA, 4-20 mA Thermocouple, RTD, mV, 0-5 V, 1-5 V, 0-10 V, 0-20 mA, 4-20 mA, | 1 _ _ - 2 _ _ - 3 _ _ - |
| Input #2 | None Thermocouple, RTD, 0-5 V, 1-5 V, 0-20 mA, 4-20 mA Thermocouple, RTD, 0-5 V, 1-5 V, 0-10 V, -1 -1 V, 0-20 mA, 4-20 mA Two High Level Analog Inputs Instead of 1 Low Level AI Relative Humidity (Requires Output 2) Carbon, Oxygen, or Dewpoint (Requires Output 2) | _ 0 _- _ 1 _- _ 2 _- _ 3 _- _ 5 _- _ 6 _- |
| Input #3 | None Thermocouple, RTD, 0-5 V, 1-5 V, 0-20 mA, 4-20 mA Thermocouple, RTD, 0-5 V, 1-5 V, 0-10 V, -1 -1 V, 0-20 mA, 4-20 mA Two High Level Analog Inputs Instead of 1 Low Level AI Slidewire Input for Position Proportional Control (Requires Output #2 R_) | _
_ 0- _ _ 1- _ _ 2- _ _ 3- _ _ 4- |
| Approvals | CE (Standard) CE, UL, and CSA | 0 _ _ _ _ - 1 _ _ _ _ - |
| Tags | None Stainless Steel Customer ID Tag | _ 0000- _ T000- |
| Documentation | English User Manual English User Manual and F3391 Certificate of Conformance | E0-0 EC-0 |
| Cutout Size | 1/4 DIN |
|---|
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