Floodline® MDD-R4/T Output Relay Control Monitoring Unit

Additional, addressable control module for extracting local control of actuators and signalling devices

The Floodline® MDD-R4/T Output Relay Control Monitoring Unit is an additional, addressable control module for extracting local control of actuators and signalling devices.

MDD-R4/T digital control module expands the digital gas detection system. The module enables the separation of local control of executive devices and signalling devices for a selected group of up to 32 detectors working in the digital gas leak detection system. There are four contact outputs and two 12V alarm outputs.

MDD-R4/T communicates with MDD-256/T master contol module via industrial standard RS485 in accordance with the Modbus RTU protocol.

Simple implementation of independent groups and zones of detectors, with up to 32 items in a group, with local control of executive devices with up to three MDD-R4/T modules per group.

12V alarm outputs control audio-visual alarms.

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Floodline® MDD-R4/T Output Relay Control Monitoring Unit

Optical signalling of the contact output states OUT1, OUT2, OUT3 and OUT4 for control of fans, motors, contactors, information boards or connect with building and plant automation. The system can be configured to individual customer requirements.

The housing is adapted for mounting on TS35 rail in a standard electrical switchboard.

Configuration of the module settings can be set up manually through the MDD-256/T master control module or alternatively with special configuration software on a PC.

The module constantly receives information from MDD-256/T on the alarm state of a selected group of detectors and performs the set alarm functions by activating the optical alarm signalling and activating its own contact and alarm outputs.

Key features

Additional control module for extracting local control of actuators and signalling devices
MDD-R4/T communicates with MDD-256/T master contol module via industrial standard RS485
Simple implementation of independent groups and zones of detectors, with up to 32 items in a group
Local control of executive devices with up to three MDD-R4/T modules per group
Optical signalling of the contact output states
Control output can operate fans, motors, contactors, information boards and plant automation
The system can be configured to individual customer requirements
Housing adapted for mounting on TS35 rail in standard electrical switchboard

Customers can enjoy the additional comfort of a 10-year warranty on all Floodline® leak detection products when subscribed to the Andel Service and Maintenance Plan. Please ask for details.

Component	Specification	Details
General	Product Type	Output Relay Control Monitoring Unit (Addressable Control Module)
	Purpose	Expands the digital gas detection system by extracting local control of actuators and signalling devices for a selected group of gas detectors
	System Integration	Requires cooperation with an MDD-256/T master control module (supervisory unit)
	Group Capacity	Enables control for a selected group of up to 32 detectors within the digital gas leak detection system
	Module Grouping	Up to three MDD-R4/T modules can be used per group of detectors for expanded local control
	Communication Protocol	Communicates with the MDD-256/T master control module via industrial standard RS485, in accordance with the Modbus RTU protocol (galvanically isolated port)
	Functionality	Constantly receives information from the MDD-256/T on the alarm state of its selected group of detectors and performs set alarm functions by activating optical alarm signalling and its own contact and alarm outputs
	Benefits	Simple implementation of independent groups/zones of detectors with local control, enhanced local response to gas leaks, flexible system configuration, easy integration into electrical switchboards
	Warranty	10-year warranty (when subscribed to the Andel Service and Maintenance Plan)
Control Unit	Indicators	Optical signalling of the contact output states (OUT1, OUT2, OUT3, OUT4)
	Controls	Configuration of module settings can be set manually through the MDD-256/T master control module or alternatively with special configuration software on a PC ("MDD256_View" program running through the MDD-256/T module PORT2)
Power	Supply Voltage	24VDC (typically supplied from the master control module or a dedicated power supply)
	Power Consumption	Low, as it's a control and relay unit, not a detector itself.
Construction	Enclosure	Housing adapted for mounting on a standard TS35 rail in electrical switchgear cabinets
	Fixing	TS35 rail mounting
	Terminals	All removable terminals, allowing for easy wiring (without sleeves) and quick assembly, commissioning, and replacement
Dimensions	Dimensions (H x W x D)	106mm x 90mm x 65mm
Outputs	Contact Outputs	4 galvanically separated relay outputs (OUT1, OUT2, OUT3, OUT4) for controlling external devices such as fans, motors, contactors, information boards, or connecting to building/plant automation (BMS)
	Alarm Outputs	2 x 12VDC voltage alarm outputs (OUT5 and OUT6) for controlling additional acoustic and optical sirens (e.g., SL-21, SL-32, S-3x, LD-2 type signalling devices)
	Digital Output	RS485 digital output (Modbus RTU protocol) for communication within the gas detection system network
Monitoring	Information Received	Receives alarm state information from the supervisory MDD-256/T unit for its assigned group of detectors

Frequently asked questions

What is the primary function of the MDD-R4/T module? + -

It's an additional, addressable control module designed to provide local control of actuators and signalling devices within a Floodline digital gas detection system.

How many contact outputs does the MDD-R4/T provide? + -

It has four contact outputs.

How many alarm outputs does this module have, and what is their voltage? + -

It has two 12V alarm outputs, used for controlling acoustic and optical sirens.

How does the MDD-R4/T communicate with the main control unit? + -

It communicates with the MDD-256/T master control module via industrial standard RS485 using the Modbus RTU protocol.

What types of devices can the contact outputs control? + -

The contact outputs can operate fans, motors, contactors, information boards, or connect with building and plant automation systems.

How many MDD-R4/T modules can be used in a single group of detectors? + -

Up to three MDD-R4/T modules can be used per group of up to 32 detectors.

How are the module's settings configured? + -

Settings can be configured manually through the MDD-256/T master control module or via special configuration software on a PC.

What is the warranty period for this product? + -

Customers can receive a 10-year warranty on all Floodline leak detection products when subscribed to the Andel Service and Maintenance Plan.

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Floodline® MDD-R4/T Output Relay Control Monitoring Unit

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