Rockwell Automation 1797-IRT8 FLEX Ex Thermocouple/RTD Module - Manual (Page 19)

FLEX Ex Thermocouple/RTD Input Module 19
Publication 1797-5.4 - June 2010
Data Organization
Overrange Alarm
Lead Breakage Alarm
Fault State
Sensor Mode RTD 2,
3, or 4-wire,
TC Sensor Type (such as

TC, Type B, E, J..., RTD or
mV
Internal Reference
Junction (TC mode)
Individually for each channel
Individually for each channel
Individually for each channel (includes overrange, lead
breakage and short circuit)
Common to groups of 4 channels (ch 0…3, ch 4…7)
Common to groups of 4 channels (ch 0…3, ch 4…7)
Common to all channels (0 °C, 20 °C, 25 °C, 30 °C, 40 °C, 50
°C, 60 °C, 70 °C selectable
Output (Intrinsically Safe)
(16 Position Male/Female
Flexbus Connector) U
i
< 5.8V
I
i
< 400 mA
Li = Negligible
Ci < 1.35
F
Isolation Path
Input to Power Supply
Input to Flexbus
Input to Input
Power Supply to Flexbus Isolation Type
Galvanic to DIN EN60079-11
Galvanic to DIN EN60079-11
None
Galvanic to DIN EN60079-11
Power Supply
(+V, -V Intrinsically Safe) U
i
< 9.5V dc
I
i
< 1 A
Li = Negligible
Ci = Negligible
Module Field-side Power
Consumption 1.6 W
Power Dissipation 1.6 W
Thermal Dissipation Max 5.46 BTU/hr
Module Location Cat. No. 1797-TB3 or 1797-TB3S Terminal Base Unit
Conductor Wire Size 4 mm 2 (12 gauge) stranded max 
1.2 mm (3/64in.) insulation max
Dimensions Metric

Imperial
46 mm x 94 mm x 75 mm 
(1.8 in. x 3.7 in. x 2.95 in.)
Weight 200 g (approximate)
Keyswitch Position 2
Specifications continued on next page