Which sensors can be connected to the MR-AI8?
Sensors in range from 40 Ohm to 4 MOhm and 0 to 10 V, already stored types (e.g. PT1000) are found in the software manual, a user-defined temperature curve can also be created.
MR-F-AI8 Modbus RTU
Description
The Modbus module with 8 individually configurable resistance or voltage inputs was developed for decentralized switching tasks. It is suitable for detecting resistances and voltages of, for example, passive and active temperature sensors, electrical vent and mixing valves, valve positions, etc. The inputs can be configured universally by means of standard registers via a Modbus master. 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
Modbus RTU
00 to 99
RS485 (two-wire bus)
1200 to 115200 bit/s
24 V AC/DC +/- 10 % (SELV)
65 mA (AC) / 25 mA (DC)
100 %
8 x individually configurable
40 Ohm to 4 MOhm
0 V to 10 V DC
15 bit
10 mV
0.1 %
1 %
Green and red LED
50 x 69.3 x 60 mm
104 g
-5 °C to 55 °C
-20 °C to 70 °C
IP40 / IP20
Check US distributor inventory
Accessories
Accessory of
Part number
1108321370
4251394620626
Downloads
FAQ's
Can passive three or four wire sensors be connected to the MR-AI8?
No, only possible with the EWIO2.
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).