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
Faulty Goods and Warranty
Where such goods have been supplied we undertake to repair or replace them as quickly as possible.Prior to returning faulty items, please contact us with a description of the fault as one of our engineers might be able to assist you by resolving the issue over the phone.
A Warranty form must be filled out and returned with any goods.
Our standard warranty period is 12 months from the date of purchase unless stated otherwise.
Other warranty periods:
Labjack Products: 5 Years
Atop Products: 3 Years
MeanWell Products: 3 Years
Terracom Products: 3 Years
Warranty is subject to us being satisfied that a defect was caused by defective workmanship or materials and was not caused by or was not substantially contributed to by other factors beyond our control including incorrect installation, alterations or modifications of the product not recommended by the manufacturer.
Returns Policy
If you are dissatisfied with our goods you may return them within 14 days of the dispatch date. Contact us for an authorisation and we will refund your purchase less shipping costs and restocking fees. All returned goods MUST be in AS NEW condition including ALL PACKAGING and DOCUMENTATION / MANUALS etc.
Please note:
- The product returned will attract a 20% restocking fee.
- The customer must pay the delivery costs.
- Non standard, custom made or a specially manufactured or imported products are not returnable.
- Semiconductors, books and software are not refundable
Full Terms and Conditions
By placing an order with Ocean Controls, you agree to be bound by our Terms and Conditions of Trade.
