mBC083 Manual Rev A03 - CMC Industrial Electronics

mBC081 Bus Converter Technical Manual
BUS CONVERTER
Modbus RTU RS485 to IS Sensor Bus
/i
mBC083
mBC083
Bus Converter
Document No. 11755, Revision A03
March 2015
2001-2015 CMC Industrial Electronics Ltd.
CMC INDUSTRIAL ELECTRONICS LTD
Phone: (604) 421-4425 Toll Free: (888) 421-4425 Fax: (604) 421-7734
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mBC083 Bus Converter Technical Manual /ii
Revision History
REV
Description
Date
App.
A00
First Release
Jan 28/14
A01
Hazardous location rating of mBC changed
Aug 21/14
VA
A02
Added warning statement section 3.2
Sept 08/14
VA
A03
Added caution statements in sections 3.5 and 3.6;
Mar 12/15
VB
Web site link added in Appendix 2;
Figure 5 updated (AdaptaNet);
Drawings 10539, 10826, 11631, 11751 updated
(AdaptaNet)
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mBC081 Bus Converter Technical Manual /1
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mBC083 Bus Converter Technical Manual /i
Table of Contents
1.
Overview .............................................................................................................................. 1
2.
Description of Connectors, Operators and Indicators ........................................................... 3
3.
External Wiring .................................................................................................................... 5
3.1
Hazardous Area Location Information ........................................................................... 5
3.2
Wiring the Power and Communications Network .......................................................... 6
3.3
Wiring the Sensor Bus Network .................................................................................... 7
3.4
Wiring the mTB006 Field Wiring Interconnects ............................................................. 9
3.5
Setting the Converter’s Modbus Address .................................................................... 10
3.6
Terminating the RS-485 Network ................................................................................ 11
4.
Intrinsically Safe Sensor Bus Operation ............................................................................. 12
5.
Modbus RS485 RTU Communications............................................................................... 14
6.
Specifications..................................................................................................................... 18
7.
Troubleshooting Guide....................................................................................................... 20
Table of Figures
Figure 1: Terminal blocks and operators of bottom board of mBC083 ........................................ 3
Figure 2: Connectors, Operators and indicators of top board of mBC083 ................................... 3
Figure 3 - Typical Data/Power Connections ................................................................................ 6
Figure 4 – Wire Size Table ......................................................................................................... 7
Figure 5 - mTB006 Field Wiring Interconnect............................................................................ 10
Figure 6: Address Switch Details .............................................................................................. 10
Figure 7: Termination and Local switch ..................................................................................... 11
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1. Overview
The mBC083 Bus Converter is an industrial device mounted in a Hazardous Location
enclosure. The device is used to connect up to 32 CMC Intrinsically Safe sensors to a Modbus
485 RTU compatible PLC or computer system.
The Intrinsically Safe Sensor Bus allows the system to be installed in hazardous environments
using a fully specified non-hazardous wiring system. Automatic bus tuning is employed to allow
a wide variation in network topology and cabling systems. The sensor bus can extend up to
300 meters (1000 feet). The sensor field bus includes a failsafe current limited sensor power
supply.
The controller is mounted in a Class I, Groups B, C & D, Division 1 & 2, Class II, Groups E, F &
G, Division 1 & 2 housing suitable for hazardous areas. The enclosure is also rated for Zones 1
& 2 and Zones 21 & 22 for both ATEX and IECEx locations. Three conduit entries are provided.
Mounting is accomplished using provided mounting holes.
Communication to the host system is via an RS485 multi-drop network using Modbus RTU
protocol. The device looks like a simple PLC to the host system. Sensor values and status are
continuously available to the host system. Sensor network polling and maintenance are
handled automatically in the background. Sensor bus fault detection and recovery are also
automatic. The serial communications system is fully isolated.
A simple flashing lamp diagnostic is included to aid field service. This diagnostic identifies open
and shorted sensor bus cables. Up to 6 sensor bus and hardware faults are annunciated.
The sensor bus is rated Intrinsically safe for Class I, Groups C & D, Division 1 and 2, Class II,
III, Groups E,F & G, Divisions 1 & 2 as well as ATEX and IECEx Zones 0, 1 & 2 and Zones 20,
21 & 22.
The Intrinsically Safe Sensor Bus uses a unique serial number provided with each sensor for
polling. The converter will automatically capture the serial numbers of sensors present on the
bus and store them in ascending order. Included in the sensors serial number is also a device
code. The device code tells the converter what type of sensor is present and how to process
the sensors data. The sensor data is presented to the host system as a single 16 bit word in
2’s complement form.
mBC083 Bus Converter Technical Manual /2
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2. Description of Connectors, Operators and Indicators
Sensor
Bus Only
Modbus RTU
Cable Only
485 OUT
SHLD
GND
DATASHIELD
DATA+
+24V
TB2
ISO
GND
DATASHIELD
DATA+
+24V
S1
TERMINATE LOCAL OUT
TB1
EXTEND LOCAL IN
485 IN
GND
DATASHIELD
DATA+
+24V
Modbus RTU
Cable Only
Figure 1: Terminal blocks and operators of bottom board of mBC083
J2
+32
+16
+8
+4
+2
+1
ADDRESS
DS2
DS1
S1
J3
Figure 2: Connectors, Operators and indicators of top board of mBC083
mBC083 Bus Converter Technical Manual /4
ID
Label
Description
TB1
RS485 IN
Inbound communications and power connections. See drawing
11754 and 11752 in the Appendices for connection details.
TB2
RS485 OUT
Outbound communications and power connections. See drawing
11754 and 11752 in the Appendices for connection details.
DS2
Communications
DS2 (green)
Status
DS1 (red)
Flashes for each valid packet received and replied to. May light
continuously, depending on the poll rate.
DS1
Normal operation, flashing 1 second on / 1 second off;
Diagnostics, a series of short flashes followed by 1 second off;
Flashes
1
2
3
4
5
6
Description
5VDC supply wire shorted to common wire
No sensors detected on the bus
Data wire shorted to common wire
Data wire shorted to 5VDC wire
Excessive bus communications errors
during an acquire serial number operation
Power on test hardware fault or Flash
memory write fault
J2
Sensor bus
cable outlet
Conduit hub reserved exclusively for the pre-wired sensor bus
cable. See drawing 11751, 10539, 10540, 10826 and 11631 in the
Appendices of this manual for connection details.
J3
S1
Top
board
Upgrade Module
Connector for firmware upgrade module
S1 - ADDRESS
+32
+16
+8
+4
+2
+1
Address Switch
To set an address turn on the switches that add up to the address
required. Switch is shown set for address 3. For address 5,
switches marked +1 and +4 would be turned on. Switch is on when
moved towards the numbers on the circuit board.
S1
Bottom
board
The TERMINATE/EXTEND switch is used to terminate the RS485
bus. When in the “TERMINATE” position, TB2 is disconnected and
the bus is terminated. Only the last device with one
communications cable connected, can have this switch set to
“TERMINATE”. In the “EXTEND” position, termination is off and
the outbound connection,TB2 is connected.
The “LOCAL IN/LOCAL OUT” switch is used to remove this device
from the RS-485 network during troubleshooting.
ISO/
SHLD
Jumper to connect isolated common to the shield terminals on TB1
and TB2
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3. External Wiring
3.1 Hazardous Area Location Information
The mBC083 has been certified for installation in the following hazardous locations:
 Caution

The use of this product in areas other than those specified above may result in an explosion or
fire. This product must be installed using the information and drawings supplied in this manual.
The field wiring cable, interconnect devices and attached sensors may only be those specified
in this manual. Substitution of components or the use of unapproved wiring invalidates the
Intrinsic Safety rating of this device.

Before attempting to install the bus converter, review the following drawings contained in
Appendix 2 of this manual:
11754
mBC083 Modbus RTU Data Network Details
11752
mBC083 Housing Assembly Details
11753
mBC083 Housing Dimension Details
11751
mBC083 Intrinsically Safe Field Wiring Overview
10539
mBC081/3 Sensor Bus Field Wiring Overview
mBC083 Bus Converter Technical Manual /6
10540
mBC081/3 Intrinsic Safety Calculations Table
11631
mBC083 Control Wiring Drawing
10826
mTB006 Field Interconnect Enclosure Installation Details

 Caution

To ensure the safe operation of this device, install the device exactly as shown in the
installation drawings. Separation of the Intrinsically Safe sensor bus cabling and all other
cabling must be maintained as required by the local Electrical Code. Do not place any other
conductors in the mBC083 Bus Converter housing than those specified in the installation
drawings. Do not modify the attached sensor bus cable in any way. Do not mix Intrinsically
Safe cables and non-safe cables in the same cable tray. Select cabling and wiring accessories
for the sensor bus that will protect the mechanical and electrical integrity of the cabling system
and meet the Electrical Code requirements for your area.

3.2 Wiring the Power and Communications Network
The mBC083 is equipped with 2 terminal strips for the RS485 communications network. The
second terminal strip allows for the continuation of the network. The terminal strip labelled
incoming should be used to connect the cable coming from the Modbus master station. The
outgoing terminal block should be used to continue the network. The RS485 network does not
allow taps or tees in the cabling topology. Always bring both incoming and outgoing network
cables directly to the mBC083. At the end of the cabling system the outbound terminal strip is
left unconnected.
POWER/DATA WIRING IS NOT INTRINSICALLY SAFE
PROVIDE WIRING SYSTEM SUITABLE FOR INSTALLED LOCATION
S1
TB1
LOCAL IN
+24V
DATA+
SHIELD
DATAGND
485 IN
EXTEND
LOCAL OUT
+24V
DATA+
SHIELD
DATAGND
TERMINATE
GND
485 OUT
TB2
+24V
DATA+
SHIELD
DATA-
+24V
DATA+
SHIELD
DATAGND
Figure 3 - Typical Data/Power Connections
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The RS485 Modbus RTU bus is not Intrinsically Safe and must be wired using approved cabling
for the rating of the installed area. Plug any unused conduits hubs on the enclosure.
 Caution

THE mBC083 MUST BE POWERED BY AN SELV / PELV TYPE POWER SUPPLY IN A
VOLTAGE RANGE OF 18 TO 28 VDC.

No cables other than the protected IS cable and the two Modbus RS485 RTU cables can be
present in the enclosure. Do not use the enclosure as a junction box or to route any other cable
systems. Follow the instructions on drawings 11754 and 11752 exactly to route and install the
cables. Bare wires or unprotected cables must not be present below the upper circuit board.
The following table describes the recommended wire sizes for different length cable runs. A
cross reference table to Tappan Wire part numbers is also provided. Any 4 conductor overall
shielded cable can be used.
AWG
<
<
<
>
Distance
100 ' ( 30 m )
200 ' ( 60 m )
500 ' ( 90 m )
500 ' ( 90 m )
Wire gauge
22
20
18
16
#COND
STR/SOLI
D
NOM. O.D
NOM.CAP.
#PF/FT
22
4
STR
0.137
39.7
20
4
STR
0.151
43.7
18
4
STR
0.184
46.8
16
4
STR
0.21
52
14
4
STR
0.255
53.6
UL
LISTINGS
CMP/CL3P/F
PLP
CMP/CL3P/F
PLP
CMP/CL3P/F
PLP
CMP/CL3P/F
PLP
CL3P/FPLP
AVG. LBS
PER MFT
SPEC #
16
P20270.1
22
P30003.1
32
P40073.1
47
P50023.1
71
P60024.1
Figure 4 – Wire Size Table
The mBC083 is a 1/8th load RS485 device allowing a maximum of 127 controllers from a single
RS485 host transceiver. It is recommended that the number of devices on a single network be
restricted to improve serviceability.
The RS485 data signals are fully isolated from the 24VDC supervisory power. A jumper block is
provided to allow the terminal strip SHIELD connection to be connected to the RS-485 isolated
common. The unit is shipped with common isolated. Connect the cable shield to ground at a
single point and insure the shield does not connect to ground at any other location.
The Data + line is the non-inverted RS485 data line and the Data - line is the inverted RS485
data line. The data lines of the mBC083 can be connected directly to an RS485 host or to an
RS232 host using a suitable converter.
3.3 Wiring the Sensor Bus Network
The mBC083 supports up to 32 Intrinsically Safe sensors. The Intrinsically Safe Sensor Bus
uses a single conductor for data communications. Included with the bus is 5VDC to power the
sensors. The bus converter is supplied with a pre-manufactured 3’ (1m) patch cable for the
sensor bus. The patch cable connects to a RJ-11 jack in the bus converter and a RJ-11 jack in
the field termination device. Use only the supplied patch cable or the sensor bus and do modify
the cable in any way.

mBC083 Bus Converter Technical Manual /8
 Caution

To ensure the safe operation of this device, install the device exactly as shown in the
installation drawings. Separation of the Intrinsically Safe sensor bus cabling and all other
cabling must be maintained as required by the local Electrical Code. Do not place any other
conductors in the mBC083 Bus Converter housing than those specified in the installation
drawings. Do not modify the attached sensor bus cable in any way. Do not mix Intrinsically
Safe cables and non-safe cables in the same cable tray. Select cabling and wiring accessories
for the sensor bus that will protect the mechanical and electrical integrity of the cabling system
and meet the Electrical Code requirements for your area.

Only CAT5 cable is permitted for the sensor bus. This cable is available in standard, plenum,
direct burial and Teck90/ACIC jacket configurations. The only difference between cables is the
jacket. Where the cable needs mechanical protection, we recommend direct burial cable or
cables with a Teck90/ACIC jacket. Direct burial cable has a semi-rigid, tough outer jacket with
good protection for most areas. Direct burial cable should be purchased with the available
integral copper plated steel shield. Superior Essex Type BBDGe, Part No. 04-001-55 is the
recommended direct burial cable.
The sensor bus allows for taps and tees in the network topology. The converter has an
automatic adaptive sensor bus system that adjusts for changes in the cabling topology. This
system is dynamic and requires no adjustments. Sensors can be installed anywhere on the
cable. Branch lines of any length can be used, but the entire CAT5 network, including
branches, must not exceed 305m or 1000’.
The CAT5 field wiring for the sensor bus does not require cabling and accessories suitable for
hazardous locations. The cabling system must however remain segregated from other cabling
that is not Intrinsically Safe. The cabling system must be designed to protect the conductors
from accidental connection to other sources of electrical energy. The cabling system should
also be shielded from severe electrical noise. Cable installation should prevent mechanical
damage to both the main bus cable and the individual sensor cables
 Caution

Variable Frequency Drives (VFD’s) create considerable electrical interference for low voltage
signaling systems. The high frequency PWM motor drive can easily couple into the cable
systems used for the bus converter. Provide a minimum of 2’ separation between conduits
carrying VFD motor cables and the bus converter cabling system. If possible do not run the
motor conduits parallel to the sensor bus conduits. Use metallic conduits and shielded CAT5
cable wherever possible.

In all cases the local Electrical Code regulations governing Intrinsically Safe cabling must be
complied with. This device remains Intrinsically Safe only when installed as detailed in this
manual and only when the field wiring complies with local Electrical Code provisions.
Drawing 11631 – mBC083 Control Wiring Drawing must be complied with during installation.
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3.4 Wiring the mTB006 Field Wiring Interconnects
The mTB006 Field Wiring Interconnect provides the transition between the CAT5 cable and the
cables provided with each sensor and the mBC083 Bus Converter. Each of the field devices
comes complete with 2 meters of cable and an attached RJ11 plug. The mTB006 has six RJ11
jacks to accept the field devices. Do not modify the cable attached to the mBC083 or the
cables attached to the sensors. Connect these cables directly to the RJ11 sockets on the
mTB006.
The backbone of the system is CAT5 cable, which punches down to the 110 punch-down
blocks on the mTB006 assembly. Any form of CAT5 cable including unshielded, shielded and
direct burial can be used. The mTB006 includes a NEMA4X plastic enclosure and all required
internal mounting hardware.
There are three, 110 punch-down blocks on the front of each mTB006. The center block is for
the incoming cable. This is the cable that will be supplying power and data from an mBC083 or
previous network branch. The 2 outgoing blocks are to continue the network. Punch the
cables down using an approved 110 tool. The required cable color codes are printed next to
the punch-down blocks. Use the supplied wire clamps to secure the cable to the assembly. The
shield on shielded CAT5 cable must be connected using the cable clamps. If shielded CAT5
cabling is used, connect the conduit ground plate used to bond the metal conduit fittings in the
bottom of the enclosure to the grounding terminal in the mTB006. This should only be
connected at the field interconnect enclosure where the bus converter is connected. This
establishes the single point of ground from the liquid tight conduit fitting from the bus converter
for the CAT5 cable shields. Do not connect the grounding plate to the grounding terminal at any
other mTB006.
There are 2 switches and 2 indicator lights on the mTB006. The Branch A switch controls the
network segment attached to the Network A punch-down block and Branch B switch controls
the network segment attached to the Network B punch-down block. The power lamp indicates
that 5 VDC control power is present. The Data lamp indicates that data packets are present on
the bus.
mBC083 Bus Converter Technical Manual /10
Ground strap connection
Connect only in mTB006
connected directly to the
mBC083/81
INCOMING
ON
1
BRANCH A
BRN
WBR
GRN
WGR
ORG
WOR
DATA
BLU
WBL
POWER
BRN
WBR
GRN
WGR
BLU
WBL
BRANCH A
ORG
WOR
GROUP 2
BRN
WBR
GRN
WGR
ORG
WOR
BLU
WBL
GROUP 1
BRANCH B
2
BRANCH B
Figure 5 - mTB006 Field Wiring Interconnect
When first powering up the network, have all switches off. Add each network segment,
observing the lamps. If a lamp goes out when a network segment is added, verify the wiring for
that segment. This method can also be used to troubleshoot the network in the future.
3.5 Setting the Converter’s Modbus Address
 Caution

Before removing a cover of the mBC083 for the purpose of settings, make sure that the power
of the mBC083 is off.


+32
+16
+8
+4
+2
+1
To set the converter’s address turn on the switches that add up to the address required.
Figure 6: Address Switch Details
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Each address switch adds the number shown to the address. The illustration above shows the
switch set to address 3. For address 5, switches marked +1 and +4 would be turned on. The
switch is on when the switch is moved towards the printed number on the circuit board. The
address switch is read during the power on sequence. Changes made to the address while the
controller is running will not take effect until the next power on cycle or soft reset.
3.6 Terminating the RS-485 Network
 Caution

Before removing a cover of the mBC083 for the purpose of settings, make sure that the power
of the mBC083 is off.

The RS-485 network must be terminated at the physical ends of the cabling system. RS-485
networks must be linear, branches and T’s are not permitted. At the physical ends of the
network, the device termination switch marked TERMINATE/EXTEND must be in the
TERMINATE position. The termination switch is located on the bottom board of bus converter,
see Figure 6. The RS-485 Master, mOI215 or EZSentinel128, does not have to be at one end
of the network. If the master is at the end of the network, its termination switch must be on. All
other termination switches must be off.
For easier debugging of network in fault conditions a LOCAL IN/LOCAL OUT switch is
provided. This switch disconnects the bus converter from the RS-485 network when in the
LOCAL OUT position, see figure 6.
S1
EXTEND
1
LOCAL IN
2
TERMINATE LOCAL OUT
Figure 7: Termination and Local switch
mBC083 Bus Converter Technical Manual /12
4. Intrinsically Safe Sensor Bus Operation
The converter communicates with the field sensors over an Intrinsically Safe Sensor Bus. The
bus voltage levels are 5VDC and the data bus is at 5VDC (high) when idle. The method of
signaling is Master-Slave. The Master initiates communication by sending a command
sequence. The slave device responds by controlling the bus during pre-defined read time slots.
Each slave device (sensor) has a unique serial number assigned by the manufacturer. Slave
devices are selected by polling the bus with the slave’s serial number. The serial numbers to
be polled are stored in a table within the controller. Only devices specifically designed for use
with the converter can be attached to the bus. A list of supported devices and sensors is
included in the Appendix 1 of this manual.
Polling of the sensors is automatic and continuous. The entire network of 32 sensors is polled
approximately each second. Empty entries in the serial number table are skipped. The new
values obtained from the sensors are placed in the sensor value table. The status of each
sensor, either on or off line, is maintained in the sensor status registers.
The health of the sensor data bus is reported in the converter’s status register. Physical faults
with the sensor bus are automatically reported. Status bits indicate the cause of sensor bus
faults. Controller hardware and parameter table faults are also indicated.
The sensor bus power supply is current limited and controlled. If a short circuit is detected on
the 5 VDC wire, the current is limited and then the power source is turned off. The power
source will be returned in 10 seconds. If the power bus is still shorted, the cycle repeats every
10 seconds. No damage will occur to either the data or power portions of the sensor bus due to
shorts or open conditions. Do not apply external voltage sources of any kind to the sensor bus.
This device remains Intrinsically Safe only if the sensor bus is protected from connection to
external energy sources. Local Electrical Code provisions must be followed to ensure that the
sensor bus remains Intrinsically Safe.
The sensor serial number consists of eight, single byte (8-bit) numbers. The converter has a 32
entry table for the serial numbers. Sensors are polled from this table, starting from table entry
1. The converter stores the serial number table in flash memory. The serial numbers can be
read from the table over the Modbus Network using a group of scratch pad registers. The serial
number consists of:
Byte
1
2
3
4
5
6
7
8
Description
Sensor device code
MSB of serial number
Byte 5 of serial number
Byte 4 of serial number
Byte 3 of serial number
Byte 2 of serial number
LSB of serial number
Checksum of serial number
The converter has a command register that allows operations to be controlled over the Modbus
Network. One of these commands allows the setting of sensor serial number table entries from
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mBC083 Bus Converter Technical Manual /13
the values stored in the scratchpad registers. See Section 5. Modbus 485 RTU
Communications for details.
A second command can automatically obtain the serial numbers of the sensors connected to
the bus. A special sequence is initiated, which uses a high-speed algorithm to obtain the serial
numbers. A third command allows the clearing of the serial number table. See Section 5.
Modbus 485 RTU Communications for details on initiating the serial number search and clear
commands.
If the serial number table is clear when the acquire serial number command is executed, the
serial numbers located will be placed in the table in ascending order. If the table contains
previously located serial numbers, the controller will follow this sequence to store the new serial
numbers;
1) All of the serial numbers currently attached to the sensor bus will be located and
stored in a temporary table;
2) The temporary table will be verified against the existing table and any serial numbers
from the existing table not found in the temporary table will be deleted from the
existing table;
3) Any new serial numbers from the temporary table not founding in the existing table
will be placed in the existing table in ascending order starting with the first empty
space;
This method of operation allows replacement sensors to be located and added to the table
without disturbing the table positions of the pre-existing sensors. The serial number table may
not be in true ascending order after completion of an acquire command with a previously
populated sensor serial number table.
mBC083 Bus Converter Technical Manual /14
5. Modbus RS485 RTU Communications
The controller communicates with a host computer or PLC over an RS-485 network using the
Modbus RTU protocol. The settings for the communications network are 19200 Baud, no parity
and 1 stop bit. The memory of the controller has been configured to simulate a PLC with 47, 16
bit registers. These registers are allocated as follows:
Register
40001
Typ
e
R/W
Description
Sensor number
Setting this register causes the serial number for the selected sensor to be
loaded immediately into registers 40002 – 9.
The sensor number is also used for the write sensor serial number
command. The values in registers 40002 – 9 will be written to the location
specified by this register upon execution of a write serial number
command.
The range of sensor numbers is 1 – 32. Setting the sensor number to 0will
return all zeros in the scratchpad registers. Unused serial numbers are set
to all 255’s (0x0FF).
40002 - 9
R/W
Sensor serial number
The values entered in these registers are the sensor’s serial number. The
sensor table entry is selected by register 40001. Each 16 bit register
contains 1 byte (8 bits, right justified) of the serial number. The serial
number is represented as follows:
40002 - The device code
40003 – The most significant byte of the serial number
40004 – Byte 5 of the serial number
40005 – Byte 4 of the serial number
40006 – Byte 3 of the serial number
40007 – Byte 2 of the serial number
40008 – The least significant byte of the serial number
40009 – The checksum of the serial number
The range of each serial number byte is from 0 – 255. If all bytes are set
to 255 (0x0FF), the entry is not polled during communications.
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40010
R/W
Command register
The command register contains a series of bits that initiate operations
within the controller. To initiate an operation, set the associated bit. The
controller automatically clears the bits when the operations are initiated. A
list of the bits and their functions:
0
Soft reset
1
Write serial no from
scratch
2
Acquire serial
numbers
3
Clear serial no’s
8
Channel select 0
9
Channel select 1
10 Channel select 2
11 Channel select 3
Reset the controller, equivalent to a
power on reset.
Write the serial number from registers
40002 – 9 to the table entry indicated in
register 40001.
Automatically acquire the sensor serial
numbers for all sensors connected to the
bus. If the table was cleared before
performing this operation, the serial
numbers will be retrieved and stored in
ascending order
If the sensor serial number table was
already populated, sensors that existed in
the table would remain in their previous
locations. Sensors that were in the table,
but not detected during this operation
would be deleted. Any new sensors
detected would be added to the blank
spaces in the table in ascending order.
The new table may now not be in
ascending order. This method of
operation allows the controller to acquire
replacement sensors without disturbing
the remaining sensors table positions.
Clear the serial number table of all
existing entries. The table will be filled
with 255’s (0x0FF) and no sensors will be
polled on the bus.
On multi-channel sensor devices, select
channel 0 for all sensors.
On multi-channel sensor devices, select
channel 1 for all sensors.
On multi-channel sensor devices, select
channel 2 for all sensors.
On multi-channel sensor devices, select
channel 3 for all sensors.
mBC083 Bus Converter Technical Manual /16
40011
R
Status Register
This register indicates the internal status of the converter and the sensor
bus. A set bit indicates a fault. The fault assigned to each bit is as follows:
0
Bus data shorted low The data wire is shorted to the common wire.
1
Bus data shorted high The data wire is shorted to the 5VDC wire.
2
No Sensors present
No sensors are present on the sensor bus, or
the sensor bus data wire is open.
3
Bus power overload
The 5VDC wire is shorted to the common
wire.
4
Excessive bus errors During an acquire serial number operation,
the converter detected excessive bus errors.
This condition would indicate faulty sensor
bus cabling, or excessive electrical
interference on the sensor data bus.
8
Sensor bus fault
9
Sensor table overflow More than 32 sensors were detected during a
sensor serial number acquire operation.
A sensor bus fault is present
10 Unsupported Sensor
detected
A sensor was detected in the serial number
table that is not supported by this converter.
11 In acquire
An acquire sensor serial numbers operation
is in progress.
13 RAM fault
The converters RAM did not pass the power
on test.
14 Parameter table fault The parameter table checksum is invalid or a
write to the parameter table flash memory
has failed.
15 Firmware fault
The converters flash memory firmware failed
the power on CRC test.
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400012 13
R
Sensor status
40014 45
R
40046
R
Watchdog counter, increments every second and rolls over at 65535
40047
R
Channel 0 - Software Version
Channel 1 - Address switch setting
Each bit of these registers represents a single sensor. If the bit is set the
sensor is faulted and not available. If the bit is clear the sensor is online.
Bit 0 of register 400012 represents sensor 1. Bit 31 of register 40013
represents sensor 32.
Sensor values
Each of these registers represents a sensors raw 2’s complement value.
The value is right justified, with the MSB representing the sign. Sensors
that are offline have a forced value of +4095.
mBC083 Bus Converter Technical Manual /18
6. Specifications
Description
Characteristic
Intrinsically Safe Sensor Bus
Voltage
Current
Communications
Distance
5 VDC
160mA, electronically limited
Single-Wire Bus
300m (1000’)
DC Power Supply
Voltage
Current
18 to 28 VDC
90mA @ 24VDC maximum
Communication
Standard
Distance
Input Load
Termination
RS485 differential isolated
500m (1640’)
96k, 1/8 load standard
120 balanced line
Environment
Temperature
Relative Humidity
-40C to +55C (-40F to 131F)
0 to 95% non-condensing
Enclosure
Make and Material
Dimensions
RS-485 Bus conduit opening
Single-Wire Bus conduit opening
Cast aluminum with glass window
See dimensional drawing above
¾” NPT
½” NPT
Hazardous Location Ratings
CSA/UL
Class I, Groups C & D, Divisions 1 & 2, T4
Class II, III, Groups E, F & G, Divisions 1 & 2
o
o
Type 4X, IP66, -40 C ≤ Ta ≤ 55 C
IECEx
IECExFMG13.0041X
Ex d[ia IIB Ga] IIC T4 Gb
Ex tb[ia Da] IIIC T135°C Db
ATEX
FM13ATEX0095X
II 2(1)GD
Ex d[ia IIB Ga] IIC T4 Gb
Ex tb[ia Da] IIIC T135°C Db
CE 1725
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mBC083 Bus Converter Technical Manual /19
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mBC083 Bus Converter Technical Manual /20
7. Troubleshooting Guide
Before attempting troubleshooting, familiarize yourself with the indicator lamps and address
switch settings detailed in section 2. Description of Connectors, Operators and
Indicators.
There are 2 basic systems operating within the mBC083. The first is the Modbus RTU
RS485 communications network. This network connects multiple mBC083’s to a single Host
or Master device. It is the host that polls for data from the mBC083. Before starting this
guide, insure that the host is running and polling the mBC083’s.
The second system is the sensor bus network. The mBC083 manages the sensor bus and
continually polls for sensors in its serial number table. Before starting this guide verify that
the sensor serial numbers table in the mBC083’s are correct. The status lamp on each
mBC083 provides information as to the state of the sensor bus. The mTB006 status lamps
and switches can be used to isolate network segments during troubleshooting. To isolate a
defective cable or sensor, start at the mTB006 closest to the mBC083 and disable outgoing
network segments using the switches. Observe the lamps on the mTB006 as you switch in
additional segments. If a segment has a shorted cable or sensor, the lamps will go out when
that segment is added. Note if the power conductor is shorted, the mBC083 will turn off the
5VDC supply. Wait for at least 10 seconds to see if power is restored.
Start
Are any lamps
flashing?
No
Yes
Is
24VDC present on
TB1 and TB2?
No
Check network
cabling and device
supplying 24VDC
No
Correct host
No
Correct host
No
Set addresses and
cycle the power
Yes
Replace mBC083
Is the
green lamp flashing
or on steady?
No
Is the host
polling the
mBC083's?
Yes
Yes
Is the
host polling
the correct
adresses?
Yes
Are the
mBC083
addresses
set correctly?
Yes
Check bus
voltage at first and
last device on
network
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mBC083 Bus Converter Technical Manual /21
Is Data + =
1.0 - 1.5V &
Data - =
1.5 -2.0V?
No
Is the bus
terminated
properly?
Yes
Yes
Replace mBC083
Turn off power and
break network so
only the host and the
first mBC083 are
present. Make sure
bus is terminated.
Re-apply power.
Is the green
lamp now flashing
or steady?
No
Check for
termination at the
host and insure
terminate switch is on
at the last mBC083
on network
No
Check cabling.
Replace 1st mBC083
then host until
communications is
restored.
No
Replace the mBC083
just connected
Yes
Turn off power. Add
next mBC083 to the
network Re-apply
power.
Is next
mBC083 now
communicating?
Yes
Is this the last
mBC083 on the
network?
Yes
Done
Is the red
lamp flashing at
1 sec on
1 sec off
rate?
Yes
No
Is the red
light flashing
1 short flash?
Yes
Sensor bus 5VDC
bus wire is shorted to
common wire
Yes
No sensors detected
on the bus, data wire
is open
Yes
Sensor bus data wire
is shorted to the
common wire
No
Is the red
light flashing
2 short flashes?
No
Is the red
light flashing
3 short flashes?
No
No
mBC083 Bus Converter Technical Manual /22
No
Is the red
light flashing
4 short flashes?
Yes
Data wire is shorted
to the 5VDC wire
Yes
Excessive bus
errors were detected
during a serial
number acquire
operation
Yes
The mBC083
hardware failed the
power on test or write
serial numbers to
Flash memory has
failed
No
Add the sensor's
serial number to the
table or correct the
sensor's serial
number entry in the
table
No
Check the 5VDC wire
connected to the
sensor with the
incorrect value
No
Is the red
No
light flashing
5 short flashes?
No
Is the red
light flashing
6 short flashes?
No
Any other lamp
flashing sequence,
mBC083 is defective,
replace
Are sensors
indicating fault
in the sensor
status table?
Yes
Is the
faulted
sensor's serial
number entered
in the serial
number
table?
Yes
Yes
The sensor is
defective or not
connected to the
sensor bus
Are any sensor's
value incorrect?
No
Yes
Is the sensor
bus 5VDC wire
connected to the
sensor?
Yes
Replace the sensor
Done
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mBC083 Bus Converter Technical Manual /23
Intentionally Left Blank
mBC083 Bus Converter Technical Manual /24
Appendix 1 – Supported Sensors
Only sensors supplied and approved by CMC Industrial Electronics can be used in Intrinsically
Safe systems. A wide variety of sensors are available. Contact the factory or our web site
www.cmciel.com for a list of available sensors for this system.
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mBC083 Bus Converter Technical Manual /25
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mBC083 Bus Converter Technical Manual /26
Appendix 2 – Installation Drawings
The following is a list of the installation drawing in this appendix:
All drawings and manuals referred to mBC083 are available on our website
WWW.CMCIEL.COM
10539
mBC081/3 Sensor Bus Field Wiring Overview
10540
mBC081/3 Intrinsic Safety Calculations Table
10826
mTB006 Field Interconnect Enclosure Installation Details
11631
mBC083 Control Wiring Drawing
11751
mBC083 Field Wiring Overview
11752
mBC083 Housing Assembly Details
11753
mBC083 Housing Dimension Details
11754
mBC083 Modbus RTU Data Network Details
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GROUP 1
WGR
BRANCH A
1
2
A
1
2
WBL
WBL
BLU
BLU
DATA
DATA
GROUP 2
IN
POWER
IN
INCOMING
BRANCH A BRANCH B
O
N
WOR
INCOMING
BRANCH A BRANCH B
O
N
POWER
BRANCH B
BRANCH B
WBR
WBR
WBR
1
WBL
BLU
WGR
GRN
WGR
WOR
GRN
ORG
WOR
2
WBR
IN
BRANCH B
WGR
BRN
B
WBR
BLU
Direct burial CAT5
Shielded cable
A
BRN
BRN
WBR
BLU
BLU
WBL
BRANCH A BRANCH B
O
N
BRN
GRN
GRN
ORG
ORG
BRN
WBR
WGR
WGR
WOR
WOR
WBL
BLU
WBR
BRN
WGR
GRN
WOR
ORG
ORG
WBL
GRN
WOR
WBL
ORG
BLU
WBL
GROUP 1
GROUP 1
BRANCH A
A
BRANCH A
1
2
ORG
2
DATA
BRANCH B
DATA
GROUP 2
IN
POWER
IN
INCOMING
BRANCH A BRANCH B
O
N
1
WOR
INCOMING
BRANCH A BRANCH B
O
N
POWER
GROUP 2
BRANCH B
B
BRN
BLU
WBR
GRN
GR
N
WOR
WOR
WGR
A
BRN
WBR
WGR
IN
WBR
B
GROUP 1
1
2
INCOMING
BRANCH A BRANCH B
O
N
A
BRANCH A
POWER
IN
DATA
GROUP 2
Grounding plate
Plug the mBC081/83
Bus Converter cable
into an RJ-11 jack in the
mTB006 Field Wiring
Interconnect.
BRANCH B
B
GROUP 1
1
2
INCOMING
BRANCH A BRANCH B
O
N
A
BRANCH A
WBR
BLU
WBL
ORG
BLU
ORG
OR
G
WBL
WBL
BLU
BL
U
GRN
WOR
BRN
WOR
WGR
IN
DATA
BRANCH B
B
DATE
GROUP 1
1
2
INCOMING
BRANCH A BRANCH B
O
N
A
BRANCH A
POWER
IN
DATA
GROUP 2
BRANCH B
COPYRIGHT 2015
JUN 16, 2015
B
Burnaby, BC Canada
APPROVED BY:
CHECKED BY:
DMF
VB
VB
VB
JP
PAGE:
1 OF 1
10539
DRAWING NO:
REF:
D01
REV:
CMC Industrial Electronics Ltd.
DRAWN BY:
APP.
DMF
Plug in approved sensors only, using
supplied plugs and jacks
Do not alter supplied cables
JUN 1,2015
JAN 16, 2014
APR 29, 2013
mBC081/83 Bus Converter
Sensor Bus Field Wiring Overview
DO NOT SCALE
DATE:
POWER
GROUP 2
Metallic conduit with
unshielded CAT5 cable
BLU
GRN
BRANCH B
ORG
2
WBR
NEW TYPE OF FIB USED (ADAPTANET)
WBL
ORG
WBL
DATA
BLU
BL
U
POWER
WBL
GROUP 2
BRN
BRN
GRN
GR
N
INCOMING
BLU
BRANCH A
BRN
WGR
WGR
BRN
1
BLU
WOR
GRN
BRANCH A BRANCH B
BLU
WBL
BRN
WBR
O
N
WBR
GRN
WGR
WOR
DATA
BRN
BLU
BLU
POWER
ORG
WBL
ORG
BRN
Drawing accommodates mBC083 and FIB layout changed
BLU
GROUP 2
WBL
BLU
WBR
BRN
GRN
GRN
ORG
ORG
WBL
WBL
BRN
WBR
WGR
WGR
WOR
WOR
WBL
BLU
WBR
BRN
WGR
GRN
WOR
ORG
ORG
WBL
GRN
WOR
INCOMING
BLU
WBR
D00
WGR
D01
BLU
ORG
BRANCH A
WBR
DESCRIPTION
WBR
GROUP 2
WGR
Change IN and A descriptors on one mTB006
WBR
GROUP 1
WOR
GRN
WOR
ORG
WBL
WGR
BRN
BRN
WBR
GRN
WGR
BLU
BLU
WGR
BRANCH A
WBR
WBR
BRN
GRN
GRN
ORG
ORG
WBL
WBL
BRN
WBR
WGR
WGR
WOR
WOR
WBL
BLU
WBR
BRN
WGR
GRN
WOR
ORG
ORG
WBL
GRN
WOR
GROUP 1
BRN
BRN
BLU
WOR
WOR
WBL
ORG
WBL
GRN
GRN
ORG
WGR
WGR
WGR
BRN
ORG
ORG
WBR
WBR
BLU
BLU
BL
U
BRN
BRN
WOR
GRN
ORG
WBL
BRN
WBR
WGR
WGR
GRN
WGR
WOR
WOR
WOR
BLU
BLU
GRN
GRN
WBL
ORG
OR
G
WBL
BRN
GRN
GRN
GR
N
WOR
WOR
WBL
WBL
BRN
WGR
GRN
GRN
C
BLU
GROUP 1
WBR
BLU
BLU
ORG
ORG
WBR
BRN
ORG
ORG
GRN
WOR
WBL
WBL
WGR
GRN
BRN
WBR
WOR
ORG
BRN
WGR
BRN
mBC
WBR
WGR
WGR
OR
G
BLU
WBR
BRN
WOR
WOR
WBL
WBL
BL
U
WBL
BLU
WOR
ORG
OR
G
WBL
WBR
REV
WGR
Bus Converter
mBC081/83
WBL
WGR
GRN
GR
N
WOR
WOR
WBL
BLU
ORG
GRN
WOR
WBR
BRN
WGR
GRN
WGR
GRN
WOR
ORG
WOR
ORG
BLU
WBR
BRN
ORG
WBL
WBL
WBR
GRN
WOR
See Drawing:
10588/11571 - mBC081/83 Bus
Converter Control Wiring Drawing for
notes on installing the Intrinsically Safe
wiring system
mBC083 Bus Converter Technical Manual /27
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2 .0 0 0
2 .0 0 0
0 .0 1 5
0 .0 1 5
0 .0 1 5
0 .0 1 5
0 .0 1 5
0 .0 1 5
2 .0 0 0
2 .0 0 0
2 .0 0 0
m T C 0 0 2 T h e r m o c o u p l e C o n v e r te r
m T C 0 0 3 6 P o r t T h e r m o c o u p l e M u l ti p l e x e r
m T S 0 1 1 T e m p e r a tu r e S e n s o r
m T S 0 1 2 T e m p e r a tu r e S e n s o r
m T S 0 1 4 T e m p e r a tu r e S e n s o r
m T S 0 1 5 T e m p e r a tu r e S e n s o r
m T S 0 1 6 T e m p e r a tu r e S e n s o r
m T S 0 1 7 T e m p e r a tu r e S e n s o r
m V M 0 0 1 V i b r a ti o n S e n s o r
m D T 0 0 1 H a z M o n T e s te r ( E Z T e s t)
A d a p ta N e t S w i tc h e d F I B
4)
3)
2)
1)
Complete this table to ensure your system does not exceed the capacitance and inductance
maximum allowable values for your installation.
Obtain capacitance and inductance values for sensors from data sheets for each type of sensor
used.
See Drawing 10588/11631 - mBC081/83 Bus Converter Control Wiring Drawing for notes on installing the
Intrinsically Safe wiring system.
Based on CAT5 capcitance of 52pF/m and inductance of 525nH/m for each of 4 pairs
COPYRIGHT 1999
APRIL 10, 2003
DO NOT SCALE
DATE:
Burnaby, BC Canada
CMC Industrial Electronics Ltd.
1 7 .5
8 .5
0
0
0
0
0
0
0
0
0
APPROVED BY:
CHECKED BY:
DRAWN BY:
DMF
TG
DMF
PAGE:
1 OF 1
10540
D00
REV:
mBC081/83
DRAWING NO:
REF:
mBC081/83 Bus Converter
Intrinsic Safety Calculations Table
1 0 ,0 0 0
Notes:
1 0 ,0 0 0
p er fo o t
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
0
0
0
0
0
0
0
0
0
0
T o ta l L ( m H )
0
T o ta l C ( m F )
ea c h
Q ty
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
ea c h
U n i ts
C la s s I, D iv I, G r o u p D M a x im u m
0 .0 0 0 6 4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
N o t fo r I S u s e
0
0
0
0
0
In d u c ta n c e ( m H )
DMF
JAN 16/14
Add bus converter mBC083, mTB006 & AdaptaNet
APP.
DMF
DMF
DATE
DEC 19/06
JUL 12/10
DESCRIPTION
Add new devices
Add new devices and CAT5 cable sepcifications
C la s s I, D iv I, G r o u p C M a x im u m
To t al syst e m
0 .0 0 0 0 6 4
2 .0 0 0
m T C 0 0 1 T h e r m o c o u p l e C o n v e r te r
C AT5 C a b l e
2 .0 0 0
N o t fo r I S u s e
m C M 0 0 1 C u r r en t S en s o r
m R S 0 0 1 R o ta ti o n S e n s o r
2 .0 0 0
m AM 0 0 1 An a lo g M o d u le
2 .0 0 0
0 .1 0 0
m T B 0 0 1 F i e l d I n te r c o n n e c t
2 .0 0 0
0 .0 1 0
m T B 0 0 6 F i e l d I n te r c o n n e c t
m R H 0 0 1 H u m i d i ty S e n s o r
0 .1 1 0
m D I 0 0 1 D i g i ta l I n o u t M o d u l e
1 .2 0 0
m B C 0 8 3 B u s C o n c e n tr a to r
C a p a c i ta n c e ( m F )
m B C 0 8 1 B u s C o n c e n tr a to r
D e v ice
B
C
D00
REV
mBC083 Bus Converter Technical Manual /28
The Industry Leader in HazMon Technology
WGR
ORG
BRANCH A
WOR
BLU
IS APPARATUS ENTITY PARAMETERS:
GROUP C & E (or IIB) GROUP D, F & G (or IIA)
Co (µF) ≤ 210
Co (µF) ≤ 25
Lo (mH) ≤ 5
Lo (mH) ≤ 0.5
Lo/Ro (µH/Ω ) ≤ 100
Lo/Ro (µH/Ω ) ≤ 50
Connector for incoming
cable from mBC081/83
Supplied cable from
mBC081/83
Conduit system ground plate
Install if metallic conduit
system used
Cable shields ground
connection. Connect
conduit ground plate to
the "EARTH
CONNECTION" standoff
only if shielded cables are
used and only at the
mTB006 where the
mBC081 bus converter is
connected.
Cable shield clamp
Discard clamps if shielded
cable not used.
GRN
WBR
1
WBL
WGR
WOR
GRN
INCOMING
ORG
BLU
BRANCH B
2
GRN
WOR
BRANCH B
ORG
DATA
WBR
BRN
WBR
BRN
Incoming cable CAT5 cable from preceding
mTB006 Branch A or Branch B or
Liquid Tight Conduit from mBC081/3 Enclosure
BRANCH A
ON
POWER
GROUP 2
BLU
GROUP 1
WBL
Use non-metallic liquid
tight conduit for
physical protection of
sensor cables
WBL
Branch A
CAT5 Cable
Superior Essex Direct
Burial Type BBDGe part
no. 04-001-55
WGR
BRN
DESCRIPTION
BACKPLANE BOARD UPDATED
D01
DATE
MAR 09, 2015
JAN 15, 2014
JUL 12, 2010
VB
DMF
DMF
APP.
DATE:
COPYRIGHT 2006
MAY 13, 2006
DO NOT SCALE
APPROVED BY:
CHECKED BY:
DRAWN BY:
VB
VB
JP
PAGE:
1 OF 2
10826
DRAWING NO:
D01
REV:
mTB006-6-EK2 Rev B00
REF:
Field Interconnect
Enclosure Installation Details
Burnaby, BC Canada
CMC Industrial Electronics Ltd.
CONTROLLED DRAWING
Notes:
1) Use supplied drill templates, drawing 10545A, to drill required holes
2) See page 2 for wiring details
3) See Drawing 10588/11751 - mBC081/83 Bus Converter Control Wiring Drawing
for notes on installing the Intrinsically Safe wiring system.
*** Safety Warning ***
This is an Intrinsically Safe wiring
system. No other cables except
those specified in the mBC081/83
Technical Manual are permitted in
the conduit system or junction
boxes.
Use non-metallic liquid
tight conduit for
physical protection of
sensor cables if required
DRAWING ACCOMMODATES mBC083
OMIT REF TO mTB006-4 IN NOTES
D00
C
REV
mBC083 Bus Converter Technical Manual /29
Branch B
Unshielded CAT5 cable in
metallic conduit
0.00
0.00
CMC INDUSTRIAL ELECTRONICS LTD
Phone: (604) 421-4425 Toll Free: (888) 421-4425 Fax: (604) 421-7734
www.cmciel.com sales@cmciel.com
D01
REV:
PAGE: 2 OF 2
10826
DRAWING NO:
All dimensions in inches.
If using direct burial CAT cable, carefully remove the outer jacket down to the copper shield, leaving the shield in place.
Leave a loop of 3 - 4 inches of stripped conductors if shielded cable used to allow cable to be re-connected in case of punch down error.
Remove the shield clamps from the standoffs.
Slide the cable through the strain relief into enclosure.
If using shielded cable, place the cable clamp on the exposed shield portion of the cable and attach to the standoff using the supplied screw. Discard
the clamps if shielded cable not used.
7. Using an approved 110 punch down tool, connect the cable coming from Branch A or Branch B of a prior mTB006 to the IN punch down block.
Continue the network using the Branch A or Branch B blocks of this mTB006. Do not use the IN block on a mTB006 where the mBC081/83 Bus
Converter is connected.
8. Conduit rated for the hazardous area must be used to connect the mBC081/83 to this enclosure. Use an EYS gastight fitting if required. The system is
Intrinsically Safe beyond this point and can be installed using un-rated conduit systems. If metallic conduit or metallic armored cable is used,
ensure that the supplied grounding plate is installed to provide conduit ground integrity.
9. If this enclosure is used to connect the mBC081/83 Bus Converter and you are using shielded cable, connect the conduit grounding plate to the
"EARTH CONNECTION" standoff in the lower left corner of the assembly. Do not connect the conduit grounding plate to the
standoff if you are not using shielded cable or in any mTB006 not directly connected to an mBC081/83.
10. Install the cable and strain relief assemblies for the sensors and plug the sensors into the mTB006.
11. Network cable shown is Superior Essex Direct Burial CAT5 Cable, Type BBDGe, Part no. 04-001-55. Other CAT5 cables can be used,
including standard CAT5 cable in metallic conduit or metallic armored CAT5 cable. If a non-metallic conduit system is used, shielded CAT5 cable
is recommended.
1.
2.
3.
4.
5.
6.
0.00
Instructions for Preparing and Terminating Cables for the mTB006 Field Interconnect Enclosure Kit
mBC083 Bus Converter Technical Manual /30
The Industry Leader in HazMon Technology
Metallic conduit
with unshielded
CAT5 cable
8)
7)
6)
5)
3)
4)
2)
1)
BLU
BL
U
BRN
WGR
BRN
WBR
IN
POWER
BRANCH B
WGR
GRN
WOR
BLU
B
Cabling between mTB006 Field Wiring Interconnects to be Category 5 cable
with jacketing suitable to provide physical protection for the cable.
Maximum cable length of the CAT5 cable connecting all mTB006 Field
Interconnects is not to exceed 1000' or 305m.
Protect all connections from physical damage, dust, liquids and corrosive gases.
Separate IS cabling from all other cable systems; do not mix IS cables with
control and power cables in trays or conduits, use the mTB006 Field Wiring Interconnect
only for CAT 5 cable termination.
Use strain relief devices, with watertight sealing rings on all cable entries to junction
boxes.
Do not modify or remove connectors or cabling supplied with sensors or the
mBC083 Bus Converter.
Only sensors supplied and approved by CMC Industrial Electronics Ltd. are
permitted for use on this system.
The following drawings contained in the mBC083 Technical Manual must be
reviewed and complied with when installing an Intrinsically Safe system:
11752
mBC083 Housing Assembly Details
11751
mBC083 Intrinsically Safe Field Wiring Overview
10539
mBC081-83 Sensor Bus Field Wiring Overview
10540
mBC081-83 Intrinsic Safety Calculations Table
10826
mTB006 Field Interconnect Enclosure Installation Details
11778
AdaptaNet Field Interconnect Enclosure Installation Details
WBL
DATA
WBR
DATE
CHECKED
VA
VB
DRAWN
JP
JP
COPYRIGHT 2016
21-JAN-2016
DO NOT SCALE
DATE:
VB
VA
APP.
APPROVED BY:
CHECKED BY:
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VB
J.POSPISIL
DRAWN BY:
mBC083
PAGE:
1 OF 1
11631
DRAWING NO:
REF:
mBC083 Bus Converter
Control Wiring Drawing
Burnaby, BC Canada
A03
REV:
CMC Industrial Electronics Ltd.
CONTROLLED DRAWING
1) Wiring to the mBC083 must be rated for the hazardous
area location.
2) Use an EYS fitting on sensor bus conduit exiting the mBC083
for Class 1, Zone 0-2 locations.
3) Based on ATEX and IECEx certification, power supply for
mBC083 must be in voltage range 8-28VDC and must be SELV
or PELV type only.
4) Mains power for the 24VDC power source must not
exceed 250VAC.
Notes on wiring for mBC083:
OUTPUT ENTITY PARAMETERS:
Uo/Voc = 5VDC
Io/Isc = 200mA
Po = 1W
Metallic conduit
with supplied 1m
cable
Modbus/Power Cabling
This cable system is not Intrinsically Safe.
Use armored cable or conduit system
suitable for use in Class, Division, Group
and Zone of installation
Bus Converter Ratings:
CLASS I DIV1, GROUPS C & D
CLASS II, III DIV 1, GROUPS E, F & G
AIS CLASS I DIV 1, GROUPS C, D, E, F & G
TYPE 4X, IP66/67, -40°C ≤ Ta ≤ 55°C
II 2(1)GD
Ex d[ia IIB Ga] IIC T4 Gb
Ex tb[ia Da] IIIC T135°C Db
IS APPARATUS ENTITY PARAMETERS:
GROUP C & E (or IIB) GROUP D, F & G (or IIA)
Co (µF) ≤ 210
Co (µF) ≤ 25
Lo (mH) ≤ 5
Lo (mH) ≤ 0.5
Lo/Ro (µH/Ω ) ≤ 100
Lo/Ro (µH/Ω ) ≤ 50
A
WGR
INCOMING
WBL
2
ORG
OR
G
WBL
BRANCH A BRANCH B
1
WOR
DESCRIPTION
FM APPROVALS
CERTIFIED DEVICE
Notes on Intrinsically Safe Field Wiring:
Direct burial CAT5
Shielded cable
WBR
O
N
GRN
GR
N
WOR
WOR
ORG
BRANCH A
BLU
GROUP 2
WBL
GROUP 1
BRN
HAZARDOUS AREA
GRN
REV
GN
DAT
SHI
D
DAT
A+24
ELD
A+
V
NON-HAZARDOUS
AREA
ORG
A02 RATING TABLE CHANGED REGARD TO Aug 20/14
CERTIFICATION CLASS LABEL 11718
A03 NEW TYPE OF FIB USED (ADAPTANET) JAN 21/16
ENTITY PARAMETERS ADDED
mBC083 Bus Converter Technical Manual /31
WBL
GRN
WOR
WGR
BRN
1
2
WBL
GRN
WOR
BRN
POWER
WBR
BLU
DATA
GROUP 2
IN
WGR
INCOMING
ORG
BLU
BRANCH A BRANCH B
O
N
WBR
A
BRANCH A
ORG
GROUP 1
BLU
WOR
WGR
BRANCH B
WBR
B
BRN
16-0-8-0
31-104-108-190
mTS012
mTS011
Non-metallic conduit
with shielded CAT5
cable
Connect shield
clamps to standoffs
WGR
1
2
INCOMING
BRANCH A BRANCH B
O
N
WBR
A
BRANCH A
WOR
GROUP 1
BRN
BLU
IN
POWER
DATA
GROUP 2
Use mTB006 Field Interconnect
Kits for sensor termination
BRANCH B
B
Superior Essex Direct
Burial shielded CAT5
Cable, Type BBDGe,
Part no. 04-001-55
or equivalent
mTS015
Use non-mettalic liquid tight conduit to protect sensor cables.
All sensors are designed to accept compression fitting on the
metal sleeve of the sensor
mTS012 / 5VDC
CMCIEL CANADA
GRN
WBR
BRN
WBR
B
ORG
BRN
WBR
WGR
IN
16-0-8-0
31-104-108-190
WBL
GRN
WGR
WOR
GRN
BRN
WBR
WGR
A
mTS011-1/4 5VDC
CMCIEL CANADA
WGR
GRN
WOR
WGR
BRANCH B
BLU
ORG
GRN
WOR
INCOMING
WBR
WBL
2
BRN
1
WOR
BLU
BRANCH A BRANCH B
GRN
O
N
ORG
ORG
BRANCH A
WBL
DATA
WGR
POWER
BLU
Metallic conduit with
un-shielded CAT5
cable
GRN
IS APPARATUS ENTITY PARAMETERS:
GROUP C & E (or IIB) GROUP D, F & G (or IIA)
Co (µF) ≤ 210
Co (µF) ≤ 25
Lo (mH) ≤ 5
Lo (mH) ≤ 0.5
Lo/Ro (µH/Ω ) ≤ 100
Lo/Ro (µH/Ω ) ≤ 50
WBL
BLU
GROUP 2
ORG
OUTPUT ENTITY PARAMETERS:
Uo/Voc = 5VDC
Io/Isc = 200mA
Po = 1W
WBR
Install grounding
plate if metallic
conduit system used
ORG
WOR
GROUP 1
WBL
REV
A02
DESCRIPTION
NEW TYPE OF FIB USED (ADAPTANET)
DATE
Intrinsically Safe Below This Line
JUN 16/15
VB
APP.
DATE:
COPYRIGHT 2014
14-JAN-2014
DO NOT SCALE
DMF
APPROVED BY:
DMF
CHECKED BY:
J.POSPISIL
DRAWN BY:
PAGE:
1 OF 1
11751
A02
REV:
mBC083/mTB006
DRAWING NO:
REF:
Intrinsically Safe
Field Wiring Overview
Burnaby, BC Canada
CMC Industrial Electronics Ltd.
CONTROLLED DRAWING
1) See drawing 11631 – mBC083 Bus Converter
Control Wiring Drawing for notes on installing the
Intrinsically Safe wiring system
Notes:
*** ELECTRICAL SAFETY WARNING ***
Do not install any wiring or devices not
intrinsically safe in the conduits or junction
boxes below this line. See drawing 11751 for
instructions on installing the Intrinsically Safe
wiring system. Failure to comply with these
instructions may result in explosion or fire.
Modbus/Power Cabling
This cable system is not Intrinsically Safe.
Use armored cable or conduit system suitable for use in Class,
Division and Group of installation
BRN
Connect metal
grounding plate to
“EARTH
CONNECTION”
standoff at field
interconnect where
bus converter is
connected only
WBL
GRN
1/2" Liquid Tight Conduit
from mBC083 IS cable hub
to first junction box
For Class 1, Zones 1&2 use
EYS fitting
ORG
GN
DAT
SHI
D
DAT
A+24
ELD
A+
V
CMC INDUSTRIAL ELECTRONICS LTD
Phone: (604) 421-4425 Toll Free: (888) 421-4425 Fax: (604) 421-7734
www.cmciel.com sales@cmciel.com
WBR
GN
DAT
SHI
D
DAT
A+24
ELD
A+
V
FM APPROVALS
CERTIFIED DEVICES
mBC083 Bus Converter Technical Manual /32
The Industry Leader in HazMon Technology
WBL
BLU
TB1
LOCAL IN
EXTEND
ATEX;
IECEx Plate
ISO
GND
DATASHIELD
DATA+
+24V
S1
SHLD
GND
DATASHIELD
DATA+
+24V
485 IN
CMC Genereic
Label
DATE
DRAWN
CHECKED
GROUND LUG
LOCK WASHER
BARE
DRAIN
WIRE
APP.
JAN 14/14
COPYRIGHT 2014
DATE:
DO NOT SCALE
J.POSPISIL
DMF
APPROVED BY:
DMF
CHECKED BY:
DRAWN BY:
mBC083
PAGE:
1 OF 1
11752
DRAWING NO:
REF:
A00
REV:
mBC083 Bus Coverter Housing Assembly Details
Burnaby, BC Canada
CMC Industrial Electronics Ltd.
CONTROLLED DRAWING
NO EXPOSED WIRING OF ANY
KIND IN THIS SPACE
NO EXPOSED WIRING
OF ANY KIND IN THIS
SPACE
HEAT SHRINK
TUBING AT END
OF JACKET
PREPARE MODBUS RTU CABLE AS
SHOWN BEFORE TERMINATING
DESCRIPTION
MODBUS RTU
CABLE
!!!
ONLY IN AND OUT
MODBUS CABLES
ALLOWED
!!!
REV
!!!
DO NOT USE ENCLOSURE AS
JUNCTION BOX OR MODIFY THIS
ENCLOSURE IN ANY WAY
!!!
Modbus RTU
Cable Only
CMC Model
Label
Modbus RTU
Cable Only
GND
DATASHIELD
DATA+
+24V
TB2
CABLE CONNECTED INTO MODULAR PLUG
ON THE UPPER PCB BOARD
485 OUT
Sensor
Bus Only
TERMINATE LOCAL OUT
PLACING CABLES OTHER THAN THE SENSOR BUS CABLE THROUGH THIS
OPENING OR IN THE SPACE BELOW THE UPPER PCB WILL INVALIDATE THE
INTRINSIC SAFETY RATING OF THIS DEVICE. ONLY THE PRE-WIRED SENSOR BUS
CABLE MAY PASS THROUGH THIS OPENING. DO NOT MODIFY THIS CABLE IN ANY
WAY, INCLUDING REMOVING THE CONNECTOR. SEE DRAWING 11751 – mBC083
BUS CONVERTER CONTROL WIRING DRAWING FOR NOTES ON INSTALLING THE
INTRINSICALLY SAFE WIRING SYSTEM
WARNING !
SENSOR BUS CABLE EXIT HUB
mBC083 Bus Converter Technical Manual /33
mBC083 Bus Converter Technical Manual /34
CMC INDUSTRIAL ELECTRONICS LTD
Phone: (604) 421-4425 Toll Free: (888) 421-4425 Fax: (604) 421-7734
www.cmciel.com sales@cmciel.com
The Industry Leader in HazMon Technology
Data +
Shield
Data -
+24VDC Supply
RED
GREEN
SHIELD
WHITE
BLACK
TB2
S1
TB1
GND
DATASHIELD
DATA+
+24V
1) Data Wiring uses 2 pair shielded cable with up to 8 mBC083 connected to a mOI215
Operator Interface.
2) Data wiring is not Intrinsically Safe and must use a wiring system approved for the
Class designation at the installed location.
3) Wire colors shown are for Tappan Wire P20270.1 - 2 pair 22 AWG cabling.
4) Do not allow cable shield to connect to earth ground.
5) Cable for RS-485 network should be 22 gauge for runs under 100’, 20 gauge for runs
under 200’, 18 gauge for runs under 500’ and 16 gauge for runs over 500’
6) mBC083's at the physical end of the cabling system require termination, turn the
termination switch on the bottom board only for devices at the physical end of the
cabling system.
7) See Drawing 11752 mBC083 Housing Assembly Details for details on wiring within the
mBC083 enclosure.
8) See Drawing 11631 mBC083 Control Wiring Drawing for notes on installing the
Intrinsically Safe wiring system.
4
4
4
4
20
18
16
14
GND
DATASHIELD
DATA+
+24V
DATE
ADDRESS
53.6
52
46.8
43.7
39.7
# P F/FT
N O M .C A P .
UL
C L 3 P /F P L P
P LP
C M P /C L 3 P /F
P LP
C M P /C L 3 P /F
P LP
C M P /C L 3 P /F
P LP
C M P /C L 3 P /F
L IS T IN G S
71
47
32
22
16
P E R M FT
A V G. L B S
JAN 22/14
APP.
S P EC #
P 60024.1
P 50023.1
P 40073.1
P 30003.1
P 20270.1
Burnaby, BC Canada
J.POSPISIL
DMF
APPROVED BY:
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1 OF 1
11754
DRAWING NO:
REF:
A00
REV:
CMC Industrial Electronics Ltd.
mBC083 Bus Converter
Modbus RTU Data Network Details
COPYRIGHT 2000
DATE:
0.255
0.21
0.184
0.151
0.137
N O M . O .D
CONTROLLED DRAWING
STR
STR
STR
STR
STR
D
S T R /S O L I
DO NOT SCALE
4
# CO ND
22
AW G
GND
DATASHIELD
DATA+
+24V
TB1
Address 7
Switch 1,2 and 3 on mBC on
Termination switch on interconnection board is on
DESCRIPTION
TB2
RS-485 Cable Selection Table
Part numbers are for Tappan Wire cables
ADDRESS
TB1
+32
+16
+8
+4
+2
+1
ADDRESS
GND
DATASHIELD
DATA+
+24V
S1
Address 2
Switch 2 on mBC on
GND
DATASHIELD
DATA+
+24V
TB2
+32
+16
+8
+4
+2
+1
Address 1
Switch 1 on mBC on
GND
DATASHIELD
DATA+
+24V
REV
S1
+32
+16
+8
+4
+2
+1
mBC083 Modbus RTU Data Network Notes
Switches on mBC083
Top board
mOI215 Operator Interface or
EZSentinel128
Termination is on
1
2
3
4
5
DC Common
LOCAL IN
EXTEND
LOCAL OUT
TERMINATE
LOCAL IN
EXTEND
LOCAL OUT
TERMINATE
LOCAL IN
EXTEND
LOCAL OUT
TERMINATE
mBC083 bottom board
mBC083 Bus Converter Technical Manual /35
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