MQ-7255M

Description

Features

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.

6. Highly Reliable Under Harsh Environment
Wide Operating Temperature Range: -25 ~ +75°C
Storage Temperature: -30 ~ +80°C
Humidity 10 ~ 90% RH (Non-condensing)

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

2-Way Isolation
Ethernet / 1500 VDC
I/O / 2500 VDC

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