MR-F-LD6 Modbus RTU

Description

The Modbus module with 6 analog inputs and 2 relay outputs was developed for decentralized switching tasks. Suitable to monitor electrodes of leakage sensors or the fill level of fluid containers and to switch pumps or magnetic valves. In this case it is necessary to protect the relay contacts by appropriate load-dependent measures. The resistance of the conductive fluid is measured when the electrodes are immersed. It is also possible to signal a cable break (requires sensor LKS-ZD). The module can be operated independently or via a Modbus master. Inputs and outputs can be switched and scanned via standard registers. Module address, bit rate and parity are set with two rotary switches on the front or by software. Suitable for decentralized mounting on DIN TH35 rail according to IEC 60715 in electrical distribution cabinets.

Connection with spring clamp terminal blocks (push-in)

Technical Data

General Data

Protocol

Modbus RTU

Address range

00 to F9

Bus interface

RS485 (two-wire bus)

Transmission rate

1200 to 115200 bit/s

Operating voltage

24 V AC/DC +/- 10 % (SELV)

Current consumption

80 mA (AC) / 43 mA (DC)

Relative duty cycle

100 %

Input / contacts 1 to 6

connection of the electrodes

Input / contacts C

common reference potential

Internal resistance

20 kOhm

Sinus voltage

3 Veff, 70 Hz at resistance measurement

Measuring accuracy

+/-10 % with sensor resistance 4 to 40 kOhm; +/-20 % with sensor resistance 2 to 100 kOhm

Pulse voltage

+/-16 V at wire break monitoring

Zener diodes

6.2 to 10 V can be used as line termination

Lines capacity

40 nF max. equates 400 m at 100 nF/km

Measuring interval

1.5 s

Output / contacts

2 NO contacts (SPST-NO)

Output / switching voltage

250 V AC

Output / continuous current

6 A / output

Display

Green, red and yellow LED

Dimensions (W x H x D)

50 x 69.3 x 60 mm

Weight

126 g

Operating temperature range

-5 °C to 55 °C

Storage temperature range

-20 °C to 70 °C

Ingress protection for housing / terminal blocks

IP40 / IP20

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Accessories

Submersible electrode TE2

Leakage sensor LKS1

Leakage sensor LKS-ZD black

Terminal block Type 259

Power supply NG4-F 24 V DC

USB/RS485 Converter

Typ 135 RIACON 135_3.5

Accessory of

MR-GW
Modbus RTU / Modbus TCP Gateway

MR-F-GW
Modbus RTU / Modbus TCP Gateway

Part number

Part number:

1108441370

EAN:

4251394620725

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FAQ's

What can I do if the red ERROR LED on the module lights up or there is no communication?

There are several possible causes, please check the following:

- Operating voltage (A1 / A2) connected and sufficient for the device.
- BUS (A- / B+) connected and not reversed. Pay attention to (- / +), not to A/B.
- Address (rotary switches) set correctly, must not occur twice or be 0.
- Bit rate and parity (rotary switches) set correctly, only possible in programming mode (see mounting note).
- Shielded and twisted pair cable used.
- Termination resistor (120 Ω) set on both sides.
- Bias resistors available on the BUS.
- Timeout high enough for all participants to respond (approx. 10 ms).

What can I do if the red ERROR LED on the module lights up or there is no communication?

There are several possible causes, please check the following:

- Operating voltage (A1 / A2) connected and sufficient for the device.
- BUS (A- / B+) connected and not reversed. Pay attention to (- / +), not to A/B.
- Address (rotary switches) set correctly, must not occur twice or be 0.
- Bit rate (rotary switches) set correctly, only possible in programming mode (see mounting note).
- Shielded and twisted pair cable used.
- Termination resistor (120 Ω) set on both sides.
- Bias resistors available on the BUS.
- Max Master as high as the number of physical master I/Os on the BUS.
- Max Frame high enough for all answers from participants to get through (BMT-RTR setting).

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