1. Support for MQTT Protocol MQTT stands for Message Queuing Telemetry Transport. It is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol with extremely lightweight publish/subscribe messaging transport. It is useful for mobile applications because of its small size, low power usage, minimized data packets, and efficient distribution of information to one or many receivers.
2. Built-in I/O Various I/O components are mixed with multiple channels in a single I/O module, which provides the most cost effective I/O usage and enhances performance of the I/O operations.
3. Daisy-Chain Ethernet Cabling The MQ-7200M Series has a built-in two-port Ethernet switch to implement daisy-chain topology. The cabling is much easier and total costs of cable and switch are significantly reduced.
4. LAN Bypass LAN Bypass feature guarantees the Ethernet communication. It will automatically active to continue the network traffic if any one of the MQ-7200M looses its power.
5. Dual Watchdog The Dual Watchdog is consists of a Module Watchdog and a Communication Watchdog. The actions of digital output are also associated to the Dual Watchdog. Module Watchdog is a built-in hardware circuit to monitor the operation of the module and will reset the CPU if a failure occurs in the hardware or the software. Then the Power-on Value of digital output will be loaded. Communication Watchdog is a software function to monitor the communication between the MQTT broker and the MQ-7200M.
When the MQ-7200M is disconnected from the MQTT broker for a while, the watchdog forces the digital output to pre-defined Safe Value to prevent unpredictable damage of the connected devices.
7. Power-on Value and Safe Value Power-on value and Safe Value are designed to improve system safety: Power-on Value: The Power-on Value is loaded into the digital output when the module is powered on or reset by Module Watchdog. Safe Value: When the Communication Watchdog is enabled and a Communication Watchdog timeout occurs, the “safe value” is loaded into the digital output.
8. LED indicators for DIO status The LED indicators are used to indicate the status of digital I/O on the MQ-7200M.
9. Two pair of power input pins The MQ-7200M has 4 pins as two pairs for power input to ease the wiring.
Software / Model MQ-7255M Built-in Web Server / Yes Web HMI / Yes
Communication Ethernet Port / 2 x RJ-45, 10/100 Base-TX, Switch Ports Protocol / MQTT 3.1.1 Dual Watchdog / Yes, Module (0.8 seconds), Communication (Confi gurable) PoE -
LED Indicators for System Running / Yes for Ethernet Link/Act / Yes for DI/DO status / Yes
EMS Protection ESD (IEC 61000-4-2) / ±4 kV Contact for Each Terminal and ±8 kV Air for Random Point EFT (IEC 61000-4-4) / ±2 kV for Power Line Surge (IEC 61000-4-5) / ±2 kV for Power Line
Power Reverse Polarity Protection / Yes Powered from Terminal Block / +12 ~ +48 VDC Consumption / 3.9 W
Mechanical Dimensions / (L x W x H) 120 mm x 97 mm x 42 mm Housing / Metal Installation / Wall Mounting
Environment Operating Temperature / -25 ~ +75°C Storage Temperature / -30 ~ +80°C Humidity /10 ~ 90% RH, Non-condensing