Additional specifications and description
The DRM series
This series of relay output modules are controlled using Modbus RTU protocol. Modbus RTU communication protocol is widely used and popular in industrial control systems. It is commonly employed for connecting various devices, such as sensors, actuators, and I/O modules.
The DRM series of Modbus RTU I/O modules are available with 2 or 4 relays. This product version features four relay outputs. They are controlled by a Modbus master device or a BMS system via a Modbus communication interface thus making the module quite simple to use. Thanks to its fast communication and data transmission allowing for quick response times and high-speed communication between devices, stability, reliability, and safety, the DRM is an excellent choice for industrial control equipment.
How the module works
DRM is a Modbus output module featuring relay contacts that are mechanically actuated to open/close by a magnetic force to switch signals, currents and voltages ON or OFF. These relays can be switched by writing value '1' in the corresponding Modbus Holding Registers, which can be done by a BMS system or by a Modbus master device. A complete overview of the adjustable settings and all Modbus registers can be downloaded from our website (Modbus register map). If necessary, all parameter settings can be reset to the factory default values by writing value '1' in Modbus Holding register 10.
Four relay outputs
DRM-M-04 has four relay outputs with changeover. This type of contact has one normally open or one normally closed contact. When activated by a switch actuator or an energized relay the switch contact changes state. The maximum switching current for both relay contacts is 5 A for resistive loads. The maximum switching voltage is 220 VDC or 250 VAC.
The presence of two green LEDs on the RJ45 socket of the module, with specific indications, is a common industry standard, particularly for Modbus communication. The LED functionalities are:
- On the left (Power Indication): This LED lights up when the module is supplied with power. It serves as a general indication that the module is receiving the necessary electrical power to function.
- On the right (Modbus Communication Indication): This LED illuminates when there is Modbus communication established between the module and another device on the network. It indicates that the module is actively sending or receiving Modbus messages, facilitating data exchange and communication with other devices.
These LED indicators provide valuable visual feedback about the operational status of the module, helping users monitor its power supply and Modbus communication activity at a glance.
Connecting the device is very easy. All you have to do is crimp the RJ45 cable for connecting to Modbus RTU and plug it into the socket, while the wires are connected to the device without the need to disassemble the unit. That is all about it, it is meant to be easy, no special tools are necessary!
DIN rail mounted
This module is designed to be mounted on a DIN rail inside an electrical cabinet. DIN rail electronics have a long history and are gaining popularity in various industrial sectors. Installing this device is straightforward – simply attach it to the rail and secure it using the locking pin located at the bottom. The enclosure has an ingress protection rating of IP30, providing protection against dirt and dust. Furthermore, to ensure the product durability and reliability over its lifespan, the enclosure is internally designed and manufactured using a high-quality PC-ABS plastic blend. This blend combines the toughness and heat resistance of PC with the ductility and processability of ABS.