Which initial state do the MR-DO(A)4 outputs have after a reset or communication loss?
Is defined by the value in register 1 (see software manual).
MR-DO4 Modbus RTU
Description
The Modbus module with 4 digital outputs was developed for decentralized switching tasks. It is suitable for switching electrical components, such as motors, contactors, lamps, louvers, etc. In this case it is necessary to protect the relay contacts by appropriate load-dependent measures. The module is provided with a manual control for manually switching the relays. The outputs can be switched 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 screw type terminal blocks
Technical Data
General Data
Modbus RTU
00 to 99
RS485 (two-wire bus)
1200 to 115200 bit/s
24 V AC/DC +/- 10 % (SELV)
80 mA (AC) / 40 mA (DC)
100 %
4 changeover contacts (4PDT)
250 V AC
5 A / output
360 cycles/h
Green, red and yellow LED
35 x 69.3 x 60 mm
95 g
-5 °C to 55 °C
-20 °C to 70 °C
IP40 / IP20
Check US distributor inventory
Accessories
Accessory of
Part number
1108361321
4250184135661
Downloads
- Data sheet
- ePLAN data - Registration required -
- Brochure (Data logger)
- Brochure (Modbus Gateway - Network connection of Modbus RTU fieldbus components)
- Brochure (Modbus RTU components)
- REACh Statement
- 3D-Data - Registration required -
- Mounting note (Safety Instructions multilingual )
- Mounting note (1108361321, 110836132101, 110836132170, 11083613210170)
- Software manual (Modbus Software-Handbuch)
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 switch) set correctly, must not occur twice or be 0.
- Bit rate and parity (rotary switch) set correctly, only possible in programming mode (see mounting note).
- Shielded and twisted cable used.
- Termination resistor (120 Ω) set on both sides.
- Bias resistors available once on the BUS.
- Timeout high enough for all participants to respond (approx. 10 ms).
Additional Information