PLC MODULE DRT2-DA02 DRT2DA02 DRT2-DAO2

OMRON DRT2-DA02 | DeviceNet 2-Channel Analog Output Module — Voltage / Current / 1/6000 Resolution / DIN Rail

Two Independent Channels on One DeviceNet Node

The DRT2-DA02 provides two analog output channels on a single DeviceNet node, each independently configurable for either voltage or current output. The configuration is set per channel — one channel can operate in current mode (4–20 mA) while the other runs in voltage mode (0–10V), or both can use the same range. The output range is selected via DIP switch or the OMRON Configurator tool.

This per-channel independence is the practical advantage in multi-device panels. An inverter drive may expect a 4–20 mA reference while an adjacent control valve accepts 0–10V. Rather than adding separate single-mode modules for each device type, a single DRT2-DA02 handles both from one DeviceNet address.

The 1/6,000 full-scale resolution provides 6,000 steps across the selected output range. On a 0–10V channel, this resolves to approximately 1.67 mV per count. On a 4–20 mA current channel, it resolves to approximately 2.67 µA per count. The ±0.4% accuracy at 25°C means the maximum output error at full scale is ±24 mV on a 10V range or ±64 µA on a 20 mA range — sufficient for most industrial analog control tasks including drive speed reference, valve position, and process controller setpoint.

Key Specifications

2 ms Conversion and Photocoupler Isolation

The 2 ms conversion time covers both outputs simultaneously — the PLC scan reads the DeviceNet data, the module converts both channels in 2 ms, and the updated analog voltages or currents appear at the output terminals. For the majority of industrial analog control applications — drives, valves, temperature controllers — 2 ms is well within the response time requirement.

Photocoupler isolation between the output circuits and the communications line prevents ground loops and high-frequency noise from the output field wiring coupling back into the DeviceNet communication bus. In cabinets where analog output cables run near variable-frequency drives or other noise sources, this isolation maintains communication reliability without additional filtering hardware.

FAQ

Q1: Can one channel be in voltage mode and the other in current mode simultaneously?

Yes. Each output channel is configured independently via DIP switch or the OMRON Configurator. One channel can operate in 4–20 mA current mode while the other runs in 0–10V voltage mode at the same time. The output range setting has no effect on the other channel.

Q2: What load resistance limitations apply to the two output modes?

For voltage output, the connected load must present a minimum impedance of 1 kΩ — lower impedance loads cause the output to exceed its rated current and degrade accuracy. For current output, the maximum loop resistance is 600 Ω — higher resistance in the loop prevents the output from reaching full-scale current. Verify connected device input impedance before commissioning.

Q3: How accurate is the DRT2-DA02 at elevated ambient temperatures?

At 25°C the accuracy is ±0.4% of full scale. Across the full operating temperature range (−10°C to +55°C) the accuracy specification is ±0.8% FS. This degradation is typical for precision analog circuitry under thermal variation. For applications requiring tighter accuracy at high ambient temperatures, locate the module in a temperature-controlled enclosure or derate the accuracy budget accordingly.

Q4: Is the module compatible with standard OMRON PLCs such as the CJ-series and CS-series?

The DRT2-DA02 communicates over DeviceNet as a DeviceNet slave. Any DeviceNet master scanner — including the OMRON CJ-series DeviceNet master unit or compatible third-party scanners — can communicate with this module. I/O allocation and configuration are performed through the DeviceNet master setup. The module's analog outputs are controlled by the data written to its output area in the DeviceNet master's I/O map.

Q5: What field wiring configuration does the 4–20 mA current output require?

The DRT2-DA02 current output is a sourcing (active) type — the module sources the current through the connected device. Two-wire field devices (which are powered by the 4–20 mA loop current) connect directly between the module's output terminal and signal common. Devices requiring separate power supply (passive transducers) must be wired accordingly with appropriate loop supply. Confirm the connected device's input type before wiring.