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2. Declaration of Conformity 

The device was tested according to the applicable standards. 

Conformity was proofed. The declaration of conformity is 

available at the manufacturer BTR NETCOM GmbH.

Notes Regarding Device Description

These instructions include indications for use and mounting of 

the device. In case of questions that cannot be answered with 

these instructions please consult supplier or manufacturer. 
The indicated installation directions or rules are applicable to 

the Federal Republic of Germany. If the device is used in other 

countries it applies to the equipment installer or the user to 

meet the national directions. 

Safety Instructions

Keep the applicable directions for industrial safety and preventi-

on of accidents as well as the VDE rules. 
Technicians and/or installers are informed that they have to  

electrically discharge themselves as prescribed before installati-

on or maintenance of the devices.
Only qualified personnel shall do mounting and installation 

work with the devices, see section “qualified personnel”. 
The information of these instructions have to be read and un-

derstood by every person using this device. 

Symbols

Warning of dangerous electrical voltage 

Danger

 

means that non-observance may cause risk of life,  

grievous bodily harm or heavy material damage. 

Qualified Personnel

Qualified personnel in the sense of these instructions are 

persons who are well versed in the use and installation of such 

devices and whose professional qualification meets the require-

ments of  their work. 
This includes for example:

 

Qualification to connect the device according to the VDE  

specifications and the local regulations and a qualification to 

put this device into operation, to power it down or to activate 

it by respecting the internal directions.

 

Knowledge of safety rules.

 

Knowledge about application and use of the device within the 

equipment system etc. 

1. Description

The Modbus module with 10 digital inputs is designed for local 

switching operations. It is suitable to record potential-free swit-

ching states as for example electrical limit switches of  

ventilation valves or auxiliary contacts of power contactors. The 

inputs can be operated as contact and voltage inputs (A1, 24 

VAC/DC, jumper J - A2) or with actuation to GND (A2, jumper 

J - A1), depending on the setting of the jumper J. The inputs can 

be scanned via a Modbus-Master. Setting of the slave address, bit 

rate and parity is done with the two address  

switches (x1 / x10) on the front. Possible settings are addresses 

00 to 99 and bit rates 1200, 2400, 4800, 9600, 19200, 38400, 

57600 und 115200 Bd.
The device does not participate in bus communication if the 

address is 00 (reserved for broadcast commands).

8440/899288

Digital Input Module 

MR-DI10

1108311319

5. Connection Diagram

4. Wiring Diagram

3. Technical Data

Modbus Interface

Protocoll 

Modbus RTU

Transmission rate 

1200 ... 115200 Bd  

   

(factory setting 19200 Bd Even)

Cabling 

RS485 two wire bus with voltage  

   

equalizing cable in bus / line topology

Supply

Operating voltage range  20 ... 28 V AC/DC (SELV)
Current consumption 

85 mA AC / 75 mA DC

Relative duty cycle 

100 %

Input

Input voltage 

30 V DC 

High-signal recognition 

>10 V AC/DC

Housing

Dimensions WxHxD 

1.4 x 2.8 x 2.6 in. (35 x 70 x 65 mm)

Weight 

83 g

Mounting position 

any

Mounting 

standard rail TH35 per IEC 60715

Mounting in series  

the maximum quantity of modules  

without space 

connected in line is limited to 15 or to  

   

a maximum power consumption of  

   

2 Amps (AC or DC) per connection to  

   

the power supply.  

   

For any similar block of additional 

   

modules a separate connection to the 

   

power supply is mandatory.

Material 

  Housing 

Polyamide 6.6 V0 

  Terminal blocks 

Polyamide 6.6 V0

Cover plate  

Polycarbonate

Type of protection  

(IEC 60529) 

 Housing 

IP40 

  Terminal blocks 

IP20

Terminal blocks

Supply and bus 

  4 pole terminal block 

max. AWG 16 (1,5 mm²) solid wireg 

   

max. AWG 18 (1,0 mm²) stranded wire

Wire diameter 

min. 0.3 mm up to max. 1.4 mm 

   

(terminal block and jumper plug are  

   

included to each packing unit)

Module connection 

  Input/Output 

max. AWG 12 (4.0 mm²) solid wire 

   

max. AWG 14 (2.5 mm²) stranded wire

Wire diameter 

min. 0.3 mm up to max 2.7 mm

Temperature range

Operation 

-5 °C ... +55 °C

Storage 

-20 °C ... +70 °C

Protective circuitry 

polarity reversal protection of  

   

operating voltage 

   

polarity reversal protection of supply  

   

and bus

Display

Operating and bus activity green LED
Error indication 

red LED

Status of the inputs 

yellow LED

METZ CONNECT GmbH | Im Tal 2 | 78176 Blumberg | Germany
Phone +49 7702 533-0 | Fax +49 7702 533-433
Additional documentation see www.metz-connect.com

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