Online help for 4-Channel Data Logger MBM

General product information

The 4-Channel Data Logger MBM is a data logger designed for stand-alone operation. It is used to determine, process and transmit analogue and digital signals as well as data read out of sensors, machines and control units via the modbus interface. For control and regulating tasks, the 4-Channel Data Logger MBM is not only equipped with an isolated switch contact for the direct control of an actuator, but it also allows for the option to transmit data to sensors, machines or control units via the modbus interface. The 4-Channel Data Logger MBM acts as a Modbus client and uses the RS485 interface to communicate with the sensors, machines or control units. For this purpose you can either use the onBoard RS485 interface or the RS485 interface of the RS485 interface extension order option . The "Modbus/RTU" operating mode is used for data transmission. Unlike the onBoard interface, the RS485 interface extension offers a galvanically isolated RS485 interface and a galvanically isolated 5V sensor supply. Thanks to the 4 universal inputs, which can be operated in different analogue and digital modes, the 4-Channel Data Logger MBM is compatible with a large number of different sensors. When using the onBoard RS485 interface, only 2 universal inputs can be used. However, when using the optional RS485 interface extension , all 4 universal inputs remain available. The sensors can be connected directly, without additional energy sources. The energy supply is then provided from the 4-Channel Data Logger MBM , which, depending on the power supply unit used, can itself be operated without mains supply. In addition to the switchable and selectable sensor supply, the 4-Channel Data Logger MBM is also equipped with a switchable 3,3 V supply. These can also be used to control actuators. An interface for connecting a PT100 or PT1000 is moreover available following the chargeable release. By using the mobile network to transfer data to the server, the site rarely has to be physically accessed and the data can be accessed at all times.

Product characteristics:

  • Modbus client
  • Modbus via RS485 interface
  • Operating mode Modbus/RTU
  • galvanically separated RS485 interface (order option)
  • Universal inputs for digital and analogue signals
  • Switchable and adjustable supply voltage for sensors
  • Isolated switch contact
  • Internal battery compartment
  • Battery, rechargeable battery or direct power supply
  • Exactstate of charge of the battery using Coulombmethod
  • Space for additional components in the housing
  • Integrated charge control
  • Configurable via web interface
  • Device time synchronised with the sever
  • Hardware real-time clock
  • Very low commissioning & operating costs
  • Integrated durable SIM chip

Application:

  • Data exchange with Modbus server
  • Level measurement
  • Flow measurement
  • Temperature measurement
  • Transmission of measurement values of probes
  • Remote meter reading

This online help is applicable from:

  • Firmware version: 01v045
  • IoT app version: 15v000
  • Server version: 54v00x
  • Product revision: 1.2

Frequently asked questions (FAQs)

Blink code Colour Description
0x --- Transport lock (transmission OFF, measurement OFF)
1x green Last connection OK
2x red Last transmission faulty
7x red Network block/no matching provider
8x red No mobile network
9x red incorrect PIN/1 attempt remaining
10x red No mobile network connection
11x red No server available
12x red Faulty SIM chip

A detailed explanation is provided in section Three colour status LED.

Yes.

The combi antenna "Flat antenna Disc multi band 2xFME-F 2m " (301196), which contains two mobile network antennas, is recommended in such cases. Alternatively, 2 separate antennas of the same type can also be used.

A list of available antennas is provided in section Antennas.

How-To-Video: Triggering Aloha transmission mode

 

Tap theMDN Magnet (206.803) for at least 3 sec. on the position shown in the following figure.

1 MDN Magnet (206.803) 2 4-Channel Data Logger MBM

Briefly (approx. 1 sec.) tap theMDN Magnet (206.803) on the position shown in the following figure.

Use a shielded twisted pair cable to prevent electromagnetic interference caused by the environment. The total length of the cables connecting the Modbus servers must not exceed 30 m. It is advisable to use a multi-core cable in which data and power lines can be routed together. When connecting multiple Modbus servers, only a bus structure is permitted. Stubs or star and tree topologies are not permitted.

A detailed explanation is provided in section Connecting the sensors, actuators and power supply.

The RS485 interface is used for communication with Modbus servers. RS485 A and universal input 3 share a terminal on the main terminal strip. The same applies to RS485 B and universal input 4. Therefore, universal inputs 3 and 4 are not available when using Modbus.

Further information is provided in section Connecting the sensors, actuators and power supply

When using the OnBoard RS485 interface:

Via the checkbox "Termination" located in the input mask for configuring the modbus interface, the 120Ω termination resistance between RS485 A and B can be switched on. (see Modbus interface)

The onBoard RS485 interface has no clamp resistances (pull up to RS485 A and pull down to RS485 B).

A detailed explanation is provided in section Technical details about the onBoard RS485 interface.

 

When using the optional RS485 interface extension :

In contrast to the onBoard RS485 interface, the 120Ω terminal resistance cannot be activated via the interface of the myDatanet server but must instead be activated via the 4-pin dip switch on the interface card. The clamp resistances can also be activated via this dip switch. The following table indicates the required settings for the switches.

Note: Only the combination of switch positions indicated in this table are permissible.

Dip switch to activate/deactivate the terminal or clamp resistances
S1 S2 S3 S4  
Off Off Off Off Neither terminal nor clamp resistance active
Off Off Off On 120Ω terminal resistance or RS485 A and RS485 B
On On Off Off 390Ω clamp resistances active
On On On Off 140Ω terminal resistaces and 390Ω clamp resistances active

Default settings upon delivery

A detailed explanation is provided in section RS485 interface extension.

Connection examples (digital, open collector output, 0/4...20 mA, 0...2/10 V)

1 Main terminal block of the 4-Channel Data Logger MBM 4 2-wire mA sensor
2 Isolated relay contact 5 3-wire mA sensor or 3-wire U-sensor
3 Sensor with open collector output    

Connection examples (active mA output)

1 Main terminal block of the 4-Channel Data Logger MBM 2 Active mA output, transducer or isolation transformer

A detailed explanation is provided in section Connecting the sensors, actuators and power supply.

Activate transport mode by setting the "operating mode" in the "Basic settings" configuration section (see Basic settings) to "transport". After that, initiate a connection (see Aloha transmission mode) to transmit the changed configuration to the 4-Channel Data Logger MBM .

A detailed explanation is provided in section Storage of the product.

Additional information