Murphy MX4 Series User manual
00-02-0695
12-06-11
Section 50
Interchange™ Comm Control
Module, MX4 Series
InstallationandOperationsManual
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our
specifications and designs at any time. The latest version of this manual can be found at www.fwmurphy.com.
Please read the following information before installing.
BEFORE BEGINNING INSTALLATION OF THIS MURPHY
PRODUCT READ AND FOLLOW ALL INSTALLATION
INSTRUCTIONS.
EXPLOSION HAZARD: SUBSTITUTION OF COMPONENTS
MAY IMPAIR SUITABILITY FOR CLASS 1, DIVISION 2
EXPLOSION HAZARD: WHEN IN HAZARDOUS LOCATIONS,
TURN OFF POWER BEFORE REPLACING OR WIRING
MODULES.
EXPLOSION HAZARD: DO NOT DISCONNECT EQUIPMENT
UNLESS POWER HAS BEEN SWITCHED OFF OR THE AREA
IS KNOWN TO BE NON-HAZARDOUS.
Please contact FW MURPHY immediately if you have any
questions.
Table of Contents
Murphy Interchange Comm Control Module Series ........................................................... 1
MX4 Thermocouple / MPU...........................................................................................1
Product Dimensions and Mounting ..............................................................................1
Accessories..................................................................................................................1
Specifications...............................................................................................................1
MX4 Installation Instructions ........................................................................................1
Installation Diagram .....................................................................................................2
MX4 Jumper Configuration...........................................................................................4
Communications..................................................................................................................... 6
MX4 Expansion Module - Modbus RTU Description....................................................7
(THIS PAGE INTENTIONALLY LEFT BLANK)
Section 50 00-02-0695
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Murphy Interchange Comm Control Module Series
The MX4 expansion module provides temperature and frequency input capability to existing
and future Murphy Controllers using CANBUS proprietary communications. Modbus® RTU
RS485/RS232 is also provided for other communication requirements. Any mix of MX-Series
modules can be added to enable Digital and Analog I/O, and Thermocouple functionality for
communication and monitoring by the master controller.
MX4 Thermocouple / MPU
CSA C/US Listed, Class I, Div. 2 Groups B, C & D
The MX4 module adds thermocouple input ability to the master. It can read up to 18
thermocouples and 1 mpu.
Product Dimensions and Mounting
Accessories
MX4 Plug Kit (00030867) Printed Terminal Plugs for MX4 Expansion I/O Module
Specifications
Operating Temperature: -40to +85C (185°F)
Storage Temperature: -40to +85C (185°F)
Power Input Voltage: 10 to 32 VDC (30W max)
MX4 Installation Instructions
When installing a MX4 Expansion I/O Module, power, I/O (Thermocouples and MPU), and
communication wiring must be in accordance with Class 1, Division 2 wiring methods [Article
501-4(b) of the National Electrical Code, NFPA 70] and in accordance with the authority having
jurisdiction.
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12-06-11 - 2-
Installation Diagram
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Section 50 00-02-0695
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MX4 Jumper Configuration
A CANBUS: Communication Link to Main I/O Module
LK1: This jumper provides a termination resistor for the CAN communication chain.
This jumper must be in place only when the I/O module is the last in the
communication chain. See control panel drawings for designation. The cover of the
MX4 must be removed to access this jumper link (LK1).
(Refer to the Communications chapter in this document)
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B RS485 Communication Port: Slave Comm. Port. (See Pictorial Above)
LK2: These jumpers provide a termination, pick-up, and pull-down resistors for
RS485 communication chain. The PU/PD jumpers should only be in one place on the
communication chain. The TR jumper must be in place only when the I/O module is
the last in the communication chain. See control panel drawings for designation. The
cover of the MX4 must be removed to access this jumper link (LK2).
(Refer to the Communications chapter in this document)
C Communication Address Select Shunts: Comm Address
LK3: These jumpers allow you to assign a unique address to each MX4 that may be
in the system. This allows the master controller to differentiate between the modules.
For example, to name the controller address 5, place the shunts on LK1 and LK4.
(Refer to the Communications chapter in this document)
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Communications
Physical Layer: The MX4 module features one asynchronous RS232 serial communication
port, one asynchronous RS485 serial communication port, and one CANBUS 2.0B proprietary
communication port.
RS232 Interconnect: The module is equipped with screw terminals called Port 1. This
connection is typically used to poll the information for a specific module using twisted shielded
pair cable suitable for RS232 networks. The simplest form of these networks are 3-wire, half-
duplex, using RX, TX and GND terminals. The TX terminal is the “TRANSMIT DATA” signal,
the RX terminal is the “RECEIVE DATA” signal, and the GND is the “COMMON GROUND”
signal for the communication line. These signal lines will take turns transmitting and receiving
depending on the device using the RS232 network at any given instant. The MX4 also
provides connections for CTS and DTR signals if required for 5 wire RS232 connections.
RS485 Interconnect: The module is equipped with screw terminals called Port 2. This
connection is typically used to poll the information for a specific module using twisted shielded
pair cable with 120 ohm impedance suitable for RS485 networks. These networks are 2-wire,
half-duplex, and feature an “A” terminal 49, “B” terminal 50, and “SHD” shielded ground
connection. The A terminal is the + or non-inverting signal, and the B terminal is the – or
inverting signal. These signal lines will take turns transmitting and receiving depending on the
device using the RS485 network at any given instant.
Baud Rate: 9600 fixed (RS232/RS485)
Protocol: Modbus RTU. This is a binary communication protocol. All data will be contained in
unsigned 16-bit Modbus Holding Registers (addressed starting at 40001). Following the
Modbus RTU specification, the Most Significant Byte in a 16-bit word is broadcast first,
followed by the Least Significant Byte.
Refer to the Modbus RTU map provided in this manual for a detailed mapping of the available
data and data scaling.
CANBUS 2.0 B Interconnect: The module is equipped with screw terminals called Port 3.
This connection is typically used to provide the interconnections between the main control
module which polls the information for a specific module using twisted shielded pair cable with
120 ohm impedance suitable for CAN networks. This network protocol is proprietary
CANBUS, and features a “HI”(CAN H) terminal 52, “LO”(CAN L) terminal 53 connection, and
“SHD” shielded ground connection.
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Communication Address Select Shunts: A jumper shunt header is provided to assign a
unique Modbus RTU and/or CANBUS address to each expansion module that may be in the
network. This allows the master controller to differentiate between the modules. Addressing is
done in binary format, and each incrementing jumper increases the weight by a factor of 2.
For example, to name the controller address 5, place the shunts on LK1 and LK4. The sum
makes 5 (4+1).
NOTE: RS485/RS232 Communication is 9600-N-8-1 for Address 0-31
and 9600-N-8-2 for Address 32-63.
Registers start at 40,001.
Stop Bits: The module will respond with 1 stop bit for Modbus RTU addresses 1 through 31
and 2 stop bits for addresses 32 through 63. This maintains flexibility for systems requiring 2
stop bits.
Modbus RTU Polling Frequency: The module should be polled by the Modbus RTU Master
with a delay of 30-50mS between packets, and typical response times will be < 100mS. This
may vary depending on the amount of data requested on each module. Typical Modbus RTU
timeout settings should be set to >= 400mS.
PC Connection: Most commercial PC’s are equipped with one RS232 serial port in the form of
a 9 pin D-Sub connection. If not, USB to RS232 adapters are also readily available. Testing
for RS485 traffic can be done using a PC equipped with any Modbus RTU Master software
and a serial interface converter that can convert RS232 traffic to RS485. The PC in this case
would serve as the Modbus RTU master in lieu of an external controller.
MX4 Expansion Module - Modbus RTU Description
Modbus
RegisterDescriptionRead/
WriteRange Data Units Definitions
40001‐
40020FactoryUseR
40021RawcountsystemvoltageR0‐1023A/Dcount0=0.0VDC,1023=5VDC
40022RawcountThermocoupleinput0R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40023RawcountThermocoupleinput1R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40024RawcountThermocoupleinput2R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40025RawcountThermocoupleinput3R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40026RawcountThermocoupleinput4R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40027RawcountThermocoupleinput5R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40028RawcountThermocoupleinput6R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40029RawcountThermocoupleinput7R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40030RawcountThermocoupleinput8R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40031RawcountThermocoupleinput9R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40032RawcountThermocoupleinput10R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
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Modbus
RegisterDescriptionRead/
WriteRange Data Units Definitions
40033RawcountThermocoupleinput11R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40034RawcountThermocoupleinput12R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40035RawcountThermocoupleinput13R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40036RawcountThermocoupleinput14R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40037RawcountThermocoupleinput15R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40038RawcountThermocoupleinput16R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40039RawcountThermocoupleinput17R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40040Rawcountcoldjunctioninput1R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40041Rawcountcoldjunctioninput2R0‐4095A/Dcount0=0.0VDC,4095=4.096VDC
40042Frequencyinput(hertz)R30–10,000Hz
40043ModbusCTSR0‐1stateofsignal
40044FactoryUseR
40045FilteredTemperature
thermocouple1R‐2000to+25000degFX10
40046FilteredTemperature
thermocouple2R‐2000to+25000degFX10
40047FilteredTemperature
thermocouple3R‐2000to+25000degFX10
40048FilteredTemperature
thermocouple4R‐2000to+25000degFX10
40049FilteredTemperature
thermocouple5R‐2000to+25000degFX10
40050FilteredTemperature
thermocouple6R‐2000to+25000degFX10
40051FilteredTemperature
thermocouple7R‐2000to+25000degFX10
40052FilteredTemperature
thermocouple8R‐2000to+25000degFX10
40053FilteredTemperature
thermocouple9R‐2000to+25000degFX10
40054FilteredTemperature
thermocouple10R‐2000to+25000degFX10
40055FilteredTemperature
thermocouple11R‐2000to+25000degFX10
40056FilteredTemperature
thermocouple12R‐2000to+25000degFX10
40057FilteredTemperature
thermocouple13R‐2000to+25000degFX10
40058FilteredTemperature
thermocouple14R‐2000to+25000degFX10
40059FilteredTemperature
thermocouple15R‐2000to+25000degFX10
40060FilteredTemperature
thermocouple16R‐2000to+25000degFX10
40061FilteredTemperature
thermocouple17R‐2000to+25000degFX10
40062FilteredTemperature
thermocouple18R‐2000to+25000degFX10
40063Coldjunction1temperatureR‐400to+1850FdegFX10
Section 50 00-02-0695
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Modbus
RegisterDescriptionRead/
WriteRange Data Units Definitions
40064Coldjunction2temperatureR‐400to+1850FdegFX10
40065FactoryUseR
40066FactoryUseR
40067Temperaturethermocouple1R‐2000to+25000degFX10
40068Temperaturethermocouple2R‐2000to+25000degFX10
40069Temperaturethermocouple3R‐2000to+25000degFX10
40070Temperaturethermocouple4R‐2000to+25000degFX10
40071Temperaturethermocouple5R‐2000to+25000degFX10
40072Temperaturethermocouple6R‐2000to+25000degFX10
40073Temperaturethermocouple7R‐2000to+25000degFX10
40074Temperaturethermocouple8R‐2000to+25000degFX10
40075Temperaturethermocouple9R‐2000to+25000degFX10
40076Temperaturethermocouple10R‐2000to+25000degFX10
40077Temperaturethermocouple11R‐2000to+25000degFX10
40078Temperaturethermocouple12R‐2000to+25000degFX10
40079Temperaturethermocouple13R‐2000to+25000degFX10
40080Temperaturethermocouple14R‐2000to+25000degFX10
40081Temperaturethermocouple15R‐2000to+25000degFX10
40082Temperaturethermocouple16R‐2000to+25000degFX10
40083Temperaturethermocouple17R‐2000to+25000degFX10
40084Temperaturethermocouple18R‐2000to+25000degFX10
40085‐
40087FactoryUseR
40088Temperatureinput1typeR/W0‐20=J,1=K
40089Temperatureinput2typeR/W0‐20=J,1=K
40090Temperatureinput3typeR/W0‐20=J,1=K
40091Temperatureinput4typeR/W0‐20=J,1=K
40092Temperatureinput5typeR/W0‐20=J,1=K
40093Temperatureinput6typeR/W0‐20=J,1=K
40094Temperatureinput7typeR/W0‐20=J,1=K
40095Temperatureinput8typeR/W0‐20=J,1=K
40096Temperatureinput9typeR/W0‐10=J,1=K
40097Temperatureinput10typeR/W0‐10=J,1=K
40098Temperatureinput11typeR/W0‐10=J,1=K
40099Temperatureinput12typeR/W0‐10=J,1=K
40100Temperatureinput13typeR/W0‐10=J,1=K
40101Temperatureinput14typeR/W0‐10=J,1=K
40102Temperatureinput15typeR/W0‐10=J,1=K
Section 50 00-02-0695
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Modbus
RegisterDescriptionRead/
WriteRange Data Units Definitions
40103Temperatureinput16typeR/W0‐10=J,1=K
40104Temperatureinput17typeR/W0‐10=J,1=K
40105Temperatureinput18typeR/W0‐10=J,1=K
40106Coldjunction1temperatureoffsetR/W‐32768to+32767degF
40107Coldjunction2temperatureoffsetR/W‐32768to+32767degF
40108FactoryUseR
40109CommunicationtimeoutR/W0–65535timeinseconds
40110ModbusDTRR/W0‐1setstateof
signal
40111‐
40115FactoryUseR
Section 50 00-02-0695
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Register 40001 Value Description
Register 40,001 is a read-only register. This register holds the model number of the hardware.
If you are using multiple Comm modules, it is sometimes helpful to confirm that you are
communicating with the expected module type. In this case, it will return 279.
Register 40042 Value Description
Register 40,042 is a read-only register. This register displays the readings of the frequency
input (magnetic pickup) in hertz (Hz).
Register 40045 – 40064 Value Description
Registers 40,045 – 40,064 are read-only registers. The values returned in these registers are
signed 16 bit data. These channels are the actual readings from the source device.
Thermocouple channels are shown in degF x 10. For example, a read value of 1200 means
120°F is being read.
NOTE: These values are not averaged before they are updated in the
MX4. The device reading these values must perform some sort of
averaging to filter out sporadic erroneous reading.
Register 40067 – 40084 Value Description
Registers 40,067 – 40,084 are read-only registers. The values returned in these registers are
signed 16 bit data. These channels are the median average readings from the source device.
This will require approximately 400ms for an accurate reading on initial power. Thermocouple
channels are shown in degF x 10. For example, a read value of 1200 means 120°F is being
read.
NOTE: These values are averaged in the MX4. These readings are used
for the displayed temperatures as they eliminate the sporadic readings
typically delivered by thermocouple devices.
Register 40088 – 40105 Value Description
Registers 40,088 – 40,105 are read/write registers. This will allow you to configure what type
of sensor is attached to each channel. The module will return a value in engineering units. Use
the list below to determine what value you should write based on the sensor installed.
0 – Type J thermocouple
1 – Type K thermocouple
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