CMC mDI001 User manual

DIGITAL INPUT MODULE
1 WIRE®SENSOR BUS
mDI001
mDI001
Digital Input Module
Document No. 11141, Revision A
March 2010
1997-2009 CMC Industrial Electronics Ltd.

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mDI001 Digital Input Module Technical Manual /i
CMC INDUSTRIAL ELECTRONICS LTD
Phone: [phone] Toll Free: [phone] Fax: [phone]
www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
Table of Contents
1. Overview..............................................................................................................................1
2. Description of Indicators and Switches ................................................................................3
3. Installation............................................................................................................................4
4. Communications..................................................................................................................7
5. Specifications.......................................................................................................................9
Table of Figures
Figure 1 - Illustration of Indicators...............................................................................................3
Figure 2 - Typical Network Layout...............................................................................................8

mDI001 Digital Input Module Technical Manual /ii
CMC INDUSTRIAL ELECTRONICS LTD
Phone: [phone] Toll Free: [phone] Fax: [phone]
www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
Revision Notes
First Release –May 12, 2009
Revision A –March 4, 2010
Correct failsafe resistor values

mDI001 Digital Input Module Technical Manual /1
CMC INDUSTRIAL ELECTRONICS LTD
Phone: [phone] Toll Free: [phone] Fax: [phone]
www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
1. Overview
The mDI001 Digital Input Module provides 4 self-powered digital inputs. A switch allows the inputs to be
set as either simple open/closed inputs or monitored failsafe inputs. The inputs are self-powered for direct
connection to switches or dry relay contacts. A programmable input sample delay is provided.
Each module has a unique digital serial number and will be automatically recognized by CMCIEL Bus
Converters. Communications utilize the Dallas 1-Wire®bus standard. Power for the module is supplied by
the bus system.
The modules are packaged in a fully potted plastic housing with a pluggable terminal strip for the inputs.
Each module comes complete with 2 meters of heavy-duty industrial cable rated for use in direct sunlight.
The cable is terminated with an RJ-11 connector for direct connection to CMCIEL wiring accessories.
When used with the mBC081 Bus Converter the device is Intrinsically Safe. In order to preserve the
Intrinsic Safety of the inputs, the field devices connected to the inputs must be physically isolated from any
line or battery powered devices.

mDI001 Digital Input Module Technical Manual /2
CMC INDUSTRIAL ELECTRONICS LTD
Phone: [phone] Toll Free: [phone] Fax: [phone]
www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
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mDI001 Digital Input Module Technical Manual /3
CMC INDUSTRIAL ELECTRONICS LTD
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www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
2. Description of Indicators and Switches
Figure 1 - Illustration of Indicators
The module requires no settings. There is one indicator lamp:
Description
Color
Flash Rate
Operation
Status
Green
1
2
3
4
5
6
Ok, no communications
Ok, communication active
Power on self test fault
Calibration parameter fault
Firmware fault
Serial number fault
There is a single input mode selector switch. The switch settings are described below:
Mode
Input Type
Standard
Inputs are simple open/closed inputs
Failsafe
Inputs use series resistors and can detect open or shorted input loops

mDI001 Digital Input Module Technical Manual /4
CMC INDUSTRIAL ELECTRONICS LTD
Phone: [phone] Toll Free: [phone] Fax: [phone]
www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
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mDI001 Digital Input Module Technical Manual /5
CMC INDUSTRIAL ELECTRONICS LTD
Phone: [phone] Toll Free: [phone] Fax: [phone]
www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
3. Installation
The module should be mounted in a dry clean environment. Do not mount the module where it can be
exposed to liquids or corrosive liquids or gases. Mount the module using the 2 mounting holes on the case
tabs. Care should be taken not to damage the housing by over-tightening the mounting screws. Connect
the cable to a field interconnect using the RJ-11 connector provided. Do not modify the cable. Protect the
cable and module from physical damage.
Note that the inputs are self-powered and no external voltage should be applied to the inputs. Each input
can source a maximum of 220A at 3.3VDC.Use switch and relay contacts that are designed to operate
reliably with very low DC current. The use of reed relays and gold plated bifurcated switch and relay
contacts is recommended. Standard silver contacts can corrode over time and the module supplies
insufficient current to clean these contacts.
The input can be configured as standard open/closed inputs or failsafe inputs that can detect an open or
shorted switch loop. The input type is switch selected on the module. The wiring for each configuration is
shown below:
Standard Open/Closed Mode Failsafe Mode
4.7K
C
1
2
3
4
C
1
2
3
4
15K
4.7K
4.7K
4.7K
15K
15K
15K
When using failsafe inputs to detect multiple switches, the switches are connected in series and a 4.7K
resistor is connected across the entire string. The second 15Kresistor is located at the last device or
end of line.

mDI001 Digital Input Module Technical Manual /6
CMC INDUSTRIAL ELECTRONICS LTD
Phone: [phone] Toll Free: [phone] Fax: [phone]
www.cmciel.com [email protected]
The Industry Leader in HazMon Technology
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