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Ac/dc relay output expansion block specifications – Rockwell Automation 1790-TXXXX Digital Expansion Terminal Block Compact Block LDX I/O  User Manual

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Publication 1790-IN005B-EN-P - April 2003

AC/DC Relay Output Expansion Block Specifications

1790-TOW8X

Relay type

Form A, normally open
Single pole, single throw

Output voltage range (load dependent)

5-28V dc @ 2.0A resistive
48V dc @ 0.8A resistive
125V ac @ 2.0A resistive
250V ac @ 2.0A resistive

Minimum load

100

µA, 100mV dc per point

Maximum on-state voltage drop

0.5V @ 2.0A, resistive load, 24V dc

Initial Contact Resistance

30m

Expected contact life

300K cycles resistive
100K cycles inductive

Maximum off-state leakage

1.5mA maximum

Output delay time

10ms maximum on to off
10ms maximum off to on

Indicators

8 green status

Common type

1 point/1COM

General Specifications

Field Power

Supply voltage - 24V dc nominal
Voltage range - 19.2-28.8V dc
Power dissipation - 2.3W @ 28.8V dc

Isolation

I/O to logic: photocoupler isolation
Isolation voltage: 1250V ac rms

Wiring

Terminal block (M3.0)
- screw torque: 7 inch-pounds
maximum (use copper or copper-clad
aluminum conductors