MODBUS RTU relay output module TDO340
TDO340 from Teracom Systems is relay output module with MODBUS RTU interface. It is a reliable 4-channel SPST device with independent contacts.
TDO340 MODBUS RTU relay output module.It is a reliable 4-channel SPST device with independent contacts.
It supports the MODBUS RTU protocol and allows you to set relay safety statuses at startup and during communication loss, ensuring your system remains secure.
The module includes a watchdog function that monitors communication failures and responds quickly to maintain safety. The TDO340 uses nonvolatile memory to remember relay states and restore them after power cycling.
It serves as an ideal relay output extension for MODBUS RTU master devices, with an RS-485 interface supporting up to 63 nodes.
Additional features include an LED indicator for communication status and a wide supply voltage range starting from 5VDC. The module also offers reinforced isolation for relay contacts, adding an extra layer of safety to your system.
A built-in 120-ohm termination resistor and easy DIN rail mounting make installation straightforward. Firmware updates can be done via the interface, simplifying maintenance
Feature:
- RS-485 interface supporting up to 63 nodes;
- Non-volatile memory to retain relay status;
- LED indicator for communication status;
- Wide supply voltage range, starting form 5VDC
- Watchdog functionality for communication loss;
- Reinforced isolation for relay contacts;
- Non-volatile memory for settings storage;
- Built-in 120ohms termination resistor;
- Easy DIN rail mounting;
- Firmware update via the interface.
Application:
- Control and monitor machinery, conveyors, and other equipment in manufacturing environments;
- Manage lighting, HVAC, and security systems in commercial buildings;
- Integrate with power distribution systems to control circuit breakers and monitor energy usage;
- Operate pumps, motors, and valves in remote or hard-to-reach locations;
- Interface with power grid components for load management and distribution automation;
- Control irrigation systems, greenhouse climate control, and livestock management;
- Manage traffic signals, street lighting, and other roadside equipment;
- Automate the operation of pumps, valves, and filtration systems in treatment facilities.
Specification:
- Physical characteristics
Dimensions: 52x91x59mm (3-module enclosure)
Weight: 101g Mounting: On 35 mm DIN top-hat rail
- Environmental limits
Operating temperature range: -20 to 60°C
Operating relative humidity range: 10 to 90% (non-condensing)
Storage temperature range: -25 to 65°C
Storage relative humidity range: 5 to 95% (non-condensing)
Ingress protection: IP40 (connections IP20)
- Power supply
Operating voltage range (including -15/+20% according to IEC 62368-1): 5 to 28VDC
Current consumption: 130mA@5V
- Relay outputs
Maximum switching current: 3A
Maximum switching AC voltage: 250V
Maximum switching DC voltage: 30V
Rated load: 3A at 250VAC, resistive, 50k cycles 3A at 30VDC, resistive, 30k cycles
Isolation: 4000 Vrms coil to contact
1000 Vrms between open contacts
Caution! If TDO340 is used to switch dangerous voltages (over 30V), a skilled person must install the device in rooms with controlled access.
- Interface
Protocol: Modbus RTU
Physical layer: RS-485 serial line
Number of bus transceivers: up to 63
Bus cable: Twisted, shielded, 2×0.5mm²
Response time ≤ 50ms
Master response time-out ≥ Response time + Answer time
The answer time depends on the number of bits and the baud rate.
- Connectors
Communication: 3.81mm pitch screwless pluggable for 28 to 16 (AWG) / 0.081 to 1.31 (mm²) wires
Relay outputs: 5.08mm pitch screwless pluggable for 26 to 14 (AWG) / 0.2 to 1.5 (mm²) wires
- Warranty
Warranty period: 3 years
Dispatch
In-stock orders are dispatched within 2 business days.
Shipping options
We deliver across Australia and internationally by any of the following methods:
- Australia Post Express
- Australia Post Parcel Post
- DHL
- FedEx (only international)
- Freight account. We'll email packaging dimensions when the shipment is ready to be book.
*Transit times vary depending on the shipping method and destination.
Store Pickup - Carrum Downs, Victoria, 3201
Order before 11am to collect after 2pm the same day. Mon–Fri, 9am–5pm, excludes public holidays.
RETURNS
How to return an item Contact us before sending anything back. Email info@oceancontrols.com.au or call +61 3 9708 2390. We'll confirm eligibility and guide you to the return process.
Return window 14 days from dispatch date.
Condition required Items must be unused and in original packaging, including all documentation and manuals.
Restocking fee A 20% restocking fee applies to all accepted returns. Return shipping costs are the customer's responsibility.
Non-returnable items
- Custom-made or specially imported products
- Software licences (some software have trial versions available)
- Items not in original, as-new condition
WARRANTY
How to make a warranty claim Before returning anything, please contact us. Our engineers can often resolve the issue remotely. If a return is required, our team will provide you with a warranty form to include with the goods.
What's covered Defects in materials and workmanship under normal use and correct installation.
What's not covered The warranty does not cover damage or failures caused by factors outside our control, including incorrect installation, unauthorised alterations or modifications, or any installation or use not recommended by the manufacturer.
Standard warranty All products carry a 12-month warranty from the date of purchase unless stated otherwise.
Extended warranty
- Labjack: 5 Years
- Atop: 5 Years
- MeanWell: 3 Years
- Teracom: 3 Years
- Novus: 3 Years
