TECHNICAL DATA (Modbus Extension)

Note for article package: The technical data below refer to the Modbus Extension only. For the technical data of the two surge arresters included in the set, please read the information in the corresponding article description (link above in the listing of the article package).

Dual-channel version for two independent Modbus RTU universes

• Number of channels: Two independent Modbus RTU channels (each with full address range)
• Number of Modbus devices: Up to 248 Modbus devices can be connected and addressed on one channel.
  Technical note: The two channels support 32 bus loads each. Please check the documentation of the Modbus devices to be connected for the bus load caused by this device in each case. Modern devices load the bus with a load between 1/4 and 1/8 units. If all connected devices load the bus with 1/8 units each (= 32 possible loads : 1/8 = 256) Load then the theoretical addressable maximum of 248 Modbus RTU devices can be used.
• Cable length: Maximum 1200 metres
• Communication: Interference-resistant communication through differential data transmission via two wires
• Plug'n'Play: This extension is automatically recognised and integrated by the Timberwolf server, set-up and administration via graphical web APP

RS-485 communication parameters (adjustable in the Timberwolf server)

• Baud rate: 1200 - 115200 (adjustable for each channel separately)
• Data bits: 8 bit
• Stop bits: 1 or 2 bit
• Parity: even, odd, none

Microswitch (for GND & switchable termination per channel)

• 120 Ohm: Terminating resistor
• 390 Ohm: Pull-up resistor
• 390 Ohm: Pulldown resistor
• Ground: Switchable GND

Galvanic isolation

• Power supply: The power supply (from USB) is galvanically isolated with an isolated DC/DC converter.
• Modbus RTU communication: The two channels are galvanically isolated from USB (data channel).

Overvoltage protection

The extension contains a basic protection against overvoltages. For a complete overvoltage and overcurrent protection of the Modbus RTU channels, we recommend the RS-485 BlitzART surge arresters from our range, which have been certified up to 10,000 V and 5,000 amperes. This Modbus extension is available in an inexpensive set together with two such RS-485 BlitzART modules.

• Surgeprotection USB: USB port is protected up to 15 kV and 24 A (8/20 us)
• Surge protectionModbus: Each Modbus RTU channel is protected up to 400 W peak pulse (80/20 us)

Display

• LED green: for power supply
• LED blue: for communication display CH 1 (flashes during data communication)
• LED blue: for communication display CH 2 (flashes during data communication)
  

Modbus RTU support in the Timberwolf server

Modbus RTU communication parameters (adjustable in Timberwolf Server)

• Poll interval: from 0.01 seconds (= 10 milliseconds between two polls)
• SupportedModbus function codes: 01 / 02 / 03 / 04 / 05 / 06 / 08 / 15 / 16 / 43
• Supportedregister widths: 1 / 16 / 32 / 48 / 64 / 96 / 128 / 256 bits in one query
• Supported Modbuserror codes: 0x81 / 0x82 / 0x83 / 0x84 / 0x85 / 0x86 / 0x88 / 0x8F / 0x90 / 0x90
• Supported Modbusexception codes: 01 / 02 / 03 / 04

Modbus RTU decoding / coding (adjustable in Timberwolf Server)

• Bit mask: Anybit mask (1 - 64 bit) can be applied for register queries with 16 / 32 / 48 / 64 bit
• Byte order: Big Endian & Little Endian (eight combinations for 16 bit / 32 bit / 64 bit)
• Data types: Bool, Integer (1 - 64 bit), Signed Integer (2 - 64 bit, as one or two's complement), Floating point 32 / 64 bit, ASCII

Value handling (configurable in Timberwolf Server)

• Configurable value check: value is equal to, within or outside value range, greater than or less than specified parameters
• Configurablevalue adjustment: calculate fixed point, replace with fixed value, invert value, free formula for any calculation up to 64 bit integer / floating point
• Conversion to Timberwolf object: All numeric values can be converted to Boolean, Integer, Floating Point or String
• Units: Physical units can be predefined
• Write direction: Most operations are also available for the write direction (towards the Modbus RTU device).
  

Connection terminals & power supply

USB interface

• USB: 2.0 type B (for connection to Timberwolf server)

Terminal for Modbus RTU connection

• Conductor type: Solid, stranded, fine-stranded
• Number of conductors: One (1) conductor may be clamped
• Cross-section: 0.05 - 1.31 mm² (30 - 16 AWG)
• Stripping length: 7 mm
• Operation of the spring clamp: Actuating push-button (orange)
  

Power supply & power consumption

• Powersupply: 5 V via USB interface (from Timberwolf server)
• Power consumption: 250 mW, this corresponds to approx. 2.2 kWh / year = 0.66 € per year at 0.30 € per kWh
  

Protection class & mounting

Protection class

• Protection class: III / SELV (according to EN60730)
• Protection class: IP 00 (according to EN 60529)

Mounting

• Construction: Open REG housing
• Mounting: This extension is intended for fixed mounting on the top-hat rail in buildings (Din Rail 35 mm according to EN50022)
• Ambient temperature: -20°C to +70 °C
• Housing material: Polyamide
• Housing colour: Green
• Dimensions: 76 mm x 46 mm x 46 mm (l x w x h with housing)
• Weight: 55 g (with housing)

Compatibility

This Isolated Dual Modbus Extension is suitable for use with all variants of the Timberwolf Server from firmware version 2.0. The extension is automatically recognised and integrated after connection via USB.

Use with other systems has not been tested, we cannot offer customer service for this.