Technical data
Publication 1794-2.1 - January 2000
FLEX I/O and FLEX Integra Product Data
2-Wire Screw Clamp Terminal Base Unit Cat. No. 1794-TB2 19
2-Wire Screw Clamp Terminal Base Unit Cat. No. 1794-TB2
1794-TB2 Terminal Base Unit
A - 0 through 15 Input/Output
B - 16 through 33 24V dc Common, 120V ac Common, or 48V dc Common
C - 34 and 51 +24V dc Power, 120V ac, or 48V dc
ATTENTION
!
• 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.
1794-TB2
COM
VV
0-15
16-33
34 & 51
A
B
C
V = 24V dc, 120V ac, or 48V dc
COM = 24V dc common, 120V ac common, or 48V dc common
41705
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
COM
Daisy-chaining
Using Adapter
Power Supply
40093
24V dc
Wiring when total current draw is less than 10A
Use this method when wiring all digital modules and total current
draw through terminal base units is less than 10A.
Daisy-chaining
with a Separate
Power Supply
42149
24V dc
Wiring when total current draw is less than 10A
Use this method when wiring all ac digital modules and total current
draw through terminal base units is less than 10A.
24V dc or
120V ac
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.
Specifications - 1794-TB2
Number of Terminals 1 row of 16
1 row of 18
1 row of 2
Terminal Screw Torque 7-9 inch-pounds
Current Capacity 10A maximum
Voltage Rating 132V ac maximum
Isolation Voltage Channel-to-channel isolation determined by
inserted module (see publication 1794-5.2)
General Specifications
Dimensions (with module
installed in base) HxWxD
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
2
1
Publication
Installation Instructions 1794-5.2
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.”
Individually
Powered from
Separate
Power Supply
Note: Use this configuration if using any
“noisy” dc digital I/O modules in your system.
Thermocouple Module wiring is separate from digital wiring.
Wiring when total current draw is greater than 10A
40094
24V dc
24V dc or
48V dc
24V dc,
120V ac, or
48V 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.
C
ombination
Daisy-chain
and Separate
Power Supply
Total current draw through any base unit must not be greater than 10A
40095
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 when wiring both digital and analog modules. Analog modules
must be wired separately from “noisy” digital modules.
Class I Division 2 certified
Groups A, B, C, D certified
Class I Zone 2 Group IIC certified