Murphy Network Card TDXM User Manual

TDXM-00064B  
Revised 06-06  
Catalog Section 10  
Temperature Scanner/Pyrometer  
TDXM Model  
Scans Up To 24 Channels  
Three (3) Adjustable Trip Points Per Channel  
Accepts Any Combination of “J” or “K” Type  
Grounded or Ungrounded Thermocouples  
2 Separate Groups with Deviation Trip Functions Selectable  
Powered By 10 to 32 VDC Systems  
RS485 Serial Communications Port  
TM  
Uses MConfig Configuration and Monitoring Software  
CSA Certified for Use in Class I, Division 2, Groups “C  
& D” Hazardous Locations  
C
US  
Description  
and temperature units can be selected as °F or °C of stop bits, and slave node number can be set using  
The innovative new TDXM now gives you a unique con-  
figurable temperature scanner/pyrometer with a built-in  
power supply. A new design features a 7-character, 7-seg-  
ment Liquid Crystal Display window with 1/2 inch (13  
mm), easy-to-read characters. Also located on the face-  
plate are membrane keys for easy configuring.  
®
readout for each channel. Unused channels can be the keypad. Communication is half-duplex. Modbus  
set to “Ignore” and will not be seen in the display RTU function codes 3 and 6 are supported.  
and will not cause fault trips.  
Specifications  
Power Input (Operating Voltages): 10- 32VDC,  
Control Options  
750 mW max.  
Each TDXM model features three outputs: 2 Field  
Effect Transistor (FET) outputs and 1 Form-C Relay  
output. Each channel has 3 setpoints, one for each of  
the outputs. This allows for greater system flexibility  
by grouping sets of channels through one output.  
Highly reliable and versatile, the TDXM accepts up to  
24 type “J” or “K” grounded or ungrounded thermo-  
Sensor Inputs: Up to 24 type “J” or “K” grounded or  
*
*
ungrounded thermocouples.  
couples. Each channel has three (3) adjustable set-  
points SP1, SP2 and SP3. The SP1, SP2 and SP3  
Setpoints correspond to the SP1, SP2 and SP3 outputs.  
Additionally it has the selectable feature to monitor and  
alarm or shutdown on deviation from an average from up  
to two groups of temperatures (GRP/DEV; deviation from  
average). One group could be exhaust temperatures and  
another group could be bearing temperatures.  
Outputs: Two (2) Outputs 0.5 A, 350 VDC, FET-sink  
to ground to trip.  
One (1) Form “C” Solid State Relay Output 0.125 A,  
350 VDC/240 VAC.  
Setpoint History  
The TDXM stores the last setpoint trip for each output  
in non-volatile memory. For instance, if SP1of channel  
1 was the last SP1 tripped, the LCD display will read:  
SP1 1when the Setpoint History is accessed for SP1.  
NOTE: The form “C” relay output is de-energized for a trip  
condition. The NC terminal is closed and the NO terminal is  
open for trip.  
®
Communications: RS485 Serial Port, MODBUS  
RTU slave.  
Operating, Storage, and Display Temperature: -40 to  
85°C (-40 to 185F).  
The TDXM is capable of communicating with controllers,  
PLC’s, computers or SCADA (Supervisory Control &  
Data Acquisition) systems by a built-in RS485 serial com-  
munications port.  
Sensor Inputs and  
Terminals  
The TDXM accepts up to 24, either “J” or “K” type  
Sensor Scan Rate: Scans all channels in 2 seconds.  
Range: Type K: 0 - 1999°F (0 - 1093°C); Type J: 0 -  
1538°F (0 - 837°C).  
Display Type: Custom 7-segment, 7-character, back-  
lit type with temperature units indication and set-  
point trip indication.  
Accuracy: Cold junction: Better than 0.5°C (1.0°F).  
Type “J” or “K”: 1°C (2°F); 38 - 1093°C  
(100 - 1999°F).  
Cold Junction Compensation: -40 to 85°C (-40 to 185F).  
Open Thermocouple Detection: Drives channel reading high.  
The TDXM-DC is available for 10 - 32 VDC systems.  
*
grounded or ungrounded thermocouples using 24  
pairs of screw type connections. Each pair has a jumper  
from the factory. Any tripped setpoint is detected within  
2 seconds after the set point is exceeded.  
User Interface (Faceplate)  
The User Interface includes a numeric LCD display  
and a 5-button membrane keypad for readout and  
channel configuration. Thermocouple types can be  
selected and setpoints entered through a series of  
setup menus, see “Setup Menus” section.  
RS485 Serial Port  
®
The RS485 serial port (MODBUS RTU slave) on  
the back of the module is provided for communicating  
with micro-controllers, PC’s, PLC’s and SCADAsys-  
tems (see “Typical Wiring Diagrams”). It is recom-  
mended that a termination resistor (customer supplied)  
be used when the TDXM is the last device connected  
in a daisy-chain configuration. The Baud rate, number  
Thermocouple Types  
Each of the 24 channels on the TDXM can be con-  
figured as either “J” or “K” type thermocouples  
*
We recommend the use of ungrounded thermocouples.  
Errors in readings with grounded thermocouples can be the  
result of differences in grounding between different devices.  
®
MODBUS is a registered trademark of AEG Schneider  
Automation Inc.  
 

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