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
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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
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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
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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
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mDI001 Digital Input Module Technical Manual /3
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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
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mDI001 Digital Input Module Technical Manual /5
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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
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mDI001 Digital Input Module Technical Manual /7
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4. Communications
The mDI001 Digital Input Module is a fully compliant Dallas 1-Wire®device. The module is supplied with
2m of cable terminated with a RJ-11 plug. The module connects to the CMCIEL wiring system through a
CMCIEL Field Interconnect.
The output of the module is a single 16 bit word. There are 3 bits for each digital input. In standard on / off
mode, the fault bits are disabled and will read as “0”. The bit assignments are shown below:
Bit
Description
0
Input 1, 0 = switch open, 1 = switch closed
1
Input 2, 0 = switch open, 1 = switch closed
2
Input 3, 0 = switch open, 1 = switch closed
3
Input 4, 0 = switch open, 1 = switch closed
4
Input 1 = 0 = OK, 1 = loop shorted
5
Input 2 = 0 = OK, 1 = loop shorted
6
Input 3 = 0 = OK, 1 = loop shorted
7
Input 4 = 0 = OK, 1 = loop shorted
8
Input 1 = 0 = OK, 1 = loop open
9
Input 2 = 0 = OK, 1 = loop open
10
Input 3 = 0 = OK, 1 = loop open
11
Input 4 = 0 = OK, 1 = loop open
The module can be configured using the CMCIEL Configuration Tool. The module has a single
configuration register the “Input Sample Time”. This register allows the setting of the input sample time,
default is 1.0 second, from 0.5 seconds to 409.5 seconds to reduce false transitions in some applications.
The module requires a bus converter to convert the Dallas 1-Wire®signaling system to a system
recognized by commercial programmable controllers. The Bus Converters provide a Modbus485 RTU
interface. CMCIEL manufactures Bus Converters for both commercial and hazardous areas. The input bit
mapped value is represented as a single word in the Bus Converter Modbus register map. The Bus
Converters will automatically acquire the serial number of the module on request.
As a Dallas 1-Wire®device, the module value is returned using the read scratch function as 3 bytes, the
first 2 bytes a signed word containing the input data and the 3rd byte the Dallas 1-Wire®- 8 bit CRC. The
family code for the module is 165 decimal or A5 Hex. The module responds to the following Dallas
function codes:
Code Decimal
Code Hex
Function
240
F0
Search ROM
85
55
Match ROM
15
0F
Read ROM
51
33
Read ROM
204
CC
Skip ROM
190
BE
Read Scratch, 3 bytes, low byte + high byte + Dallas 8 bit CRC
Refer to Dallas Semiconductor documentation for complete details on the operation of the Dallas 1-Wire®
signaling system.

mDI001 Digital Input Module Technical Manual /8
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Internet / Intranet
Desktop Computer
mTB001
mBC081
16-0-8-0
31-104-108-190
mTS011-1/4 5VDC
CMCIEL CANADA
16-0-8-0
31-104-108-190
mTS014 / 5VDC
CMCIEL CANADA
16-0-8-0
31-104-108-190
mTS012 / 5VDC
CMCIEL CANADA
mTS012
mTS011
mTS015
Indoor Commercial Application Indoor / Outdoor Industrial Application
mTB006
mTS014
mRH001
mAM001
mBC082
mOI215
mTS012
mTS015 mRS001
www.cmciel.com
STATUS
CMCIndustrial
Electronics
mRS001
Rotation
Sensor ROTATION
mCM001
mTB005
16-0-8-0
31-104-108-190
mTS014 / 5VDC
CMCIEL CANADA
mRH001
Relative Humidity
Monitor
www.cmciel.com
STATUS
CMC Industrial
Electronics
www.cmciel.com
STATUS
CMCIndustrial
Electronics
mCM001
AC Current
Monitor
0 - 5A AC
CMC Industrial
Electronics
mAM001
AnalogInput
Module
www.cmciel.com
STATUS
POWER
INPUT
12 V
I
POWER
- + I
C
V
1 2
0 4
16
64
XX X X
16-0-8-0
31-104-108-190
mDI001
www.cmciel.com
STATUS
CMC Industrial
Electronics
mDI001
Digital Input
Module
C 1 2 3 4
FAILSAFE
STANDARD
Figure 2 - Typical Network Layout

mDI001 Digital Input Module Technical Manual /9
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5. Specifications
Description
Characteristic
Sensor bus
Voltage
Current
Communications
5 VDC
3.0 mA max
1-Wire®Bus
Inputs
Voltage
Current
Delay
3.3VDC
220 A
State change delay 1 second (default)
Environment
Temperature
Relative Humidity
-40 to 70C (-40 to 165F)
0 to 100% non-condensing
Dimensions
Length
Width
Depth
74mm (2.9in)
33mm (1.3in)
30mm (1.15in)

mDI001 Digital Input Module Technical Manual /10
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