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MR-F-AO4 Modbus RTU

917853
909378
910162
909380
Description

The Modbus module with 4 analog outputs was developed for decentralized switching tasks. It is suitable as encoder for control variables, for example for electrical vent and mixing valves, valve positions, etc. The outputs can be output by means of standard registers via a Modbus master. Module address, bit rate and parity are set with 2 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)
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Technical Data
General Data
Modbus RTU
00 to 99
RS485 (two-wire bus)
1200 to 115200 bit/s
24 V AC/DC +/- 10 % (SELV)
50 mA (AC) / 20 mA (DC)
100 %
4 x analog
0 V to 10 V DC
5 mA at 10 V DC
0.3125 mV/digit
Green and red LED
35 x 69.3 x 60 mm
72 g
-5 °C to 55 °C
-20 °C to 70 °C
IP40 / IP20
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Accessories
873544
Terminal block Type 259
908429
Power supply NG4-F 24 V DC
906798
USB/RS485 Converter
905881
Typ 135 RIACON 135_3.5
Accessory of
952520
MR-GW
Modbus RTU / Modbus TCP Gateway
952521
MR-F-GW
Modbus RTU / Modbus TCP Gateway
Part number
110835130270
4251394610061
Downloads
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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