Technical data

Publication 1794-2.1 - January 2000
24 Screw Clamp Grounded Terminal Base Unit Cat. No.1794-TB3G FLEX I/O and FLEX Integra Product Data
Screw Clamp Grounded Terminal Base Unit Cat. No.1794-TB3G
Wiring
ATTENTION
!
• Total current draw through the terminal base
unit is limited to 10A. Separate power
connections may be necessary.
• Do not daisy chain power or ground from the
thermocouple terminal base unit to any ac or dc
digital module terminal base unit.
• Make certain that the hook on the terminal base
you are installing is properly hooked into the
adjacent terminal base adapter. Failure to lock
the hook into the adjacent base/adapter can
result in loss of communication on the
backplane.
• Do not force the terminal base into the adjacent
base/adapter. Forcing the units together can
bend or break the hook and allow the units to
separate and break communication over the
backplane.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
41901
1794-TB3G
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51
Chassis
Gnd
Chassis
Gnd
Chassis
Gnd
Chassis
Gnd
+V COM +V COM
24V dc
Supply
In
24V dc
Supply
Out
Chassis Ground for Shields
40586
Daisy-chaining
Using Adapter
Power Supply
Note: All modules must be thermocouple or analog modules for
this configuration.
42153
24V dc
Wiring when total current draw is less than 10A
Use this method when wiring
all analog modules and total
current draw through terminal
base units is less than 10A.
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
Specifications - 1794-TB3G
Number of Terminals 1 row of 16; 2 rows of 18
Terminal Screw Torque 7-9 inch-pounds
Current Capacity 10A maximum
Voltage Rating 31.2V dc maximum
Isolation Voltage Channel-to-channel isolation determined by
inserted module
General Specifications
Dimensions (w/mod in base) 94mm x 94mm x 69mm (3.7in x 3.7in x 2.7in)
Environmental Conditions
Operational Temperature
Storage Temperature
Relative Humidity
Shock Operating
Non-operating
Vibration
0 to 55
o
C (32 to 131
o
F)
-40 to 85
o
C (-40 to 185
o
F)
5 to 95% noncondensing
30g peak acceleration, 11(±1)ms pulse width
50g peak acceleration, 11(±1)ms pulse width
Tested 5g @ 10-500Hz per IEC 68-2-6
Conductors Wire Size
Category
12 gauge (4mm
2
) stranded maximum
22 gauge (0.35mm
2
) minimum
3/64 inch (1.2mm) insulation maximum
Category is dependent upon installed module.
1
Publication
Installation Instructions 1794-5.51
Agency Certification
1 Use this conductor category information for planning conductor routing. Refer to
publication 1770-4.1, “Industrial Automation Wiring and Grounding Guidelines for Noise
Immunity.”
Daisy-chaining
with a Separate
Power Supply
Note: All modules powered by the same power supply must be
thermocouple or analog modules for this configuration.
42154
24V dc
Wiring when total current draw is greater than 10A
Use this method when wiring
thermocouple or analog
modules and total current draw
through terminal base units is
greater than 10A.
Separate power supply can be brought in on last module in chain
if necessary. Make sure you do not jumper to adapter if using
this method.
24V dc
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
I
n
di
v
id
ua
ll
y
Powered from
Separate Power
Supply
Wiring when total current draw is greater than 10A
42155
24V dc
Separate power supply can be brought in on last module in chain if necessary.
Make sure you do not jumper to adapter if using this method.
24V dc
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
24V dc
C
om
bi
nat
i
on
Daisychain
and Separate
Power Supply
Note: All modules powered by the same power supply must be
thermocouple or analog modules for this configuration.
Total current draw through any base unit must not be greater than 10A
42156
24V dc
24V dc
Separate power supply can be brought in on last module in chain
if necessary. Make sure you do not jumper to adapter if using
this method.
Use this method to balance
current draw if necessary.
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
thermocouple or
analog module
Class I Division 2 certified
Groups A, B, C, D certified
Class I Zone 2 Group IIC certified