TDXM-00064B
Revised 06-06
Catalog Section 10
Temperature Scanner/Pyrometer
TDXM Model
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Scans Up To 24 Channels
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Three (3) Adjustable Trip Points Per Channel
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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
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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.
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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
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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.
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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.
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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
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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
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We recommend the use of ungrounded thermocouples.
Errors in readings with grounded thermocouples can be the
result of differences in grounding between different devices.
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MODBUS is a registered trademark of AEG Schneider
Automation Inc.
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