AC (120V) Isolated Output Module
(Cat. No. 1771-OD)
Installation Data
2
Suppression
Surge suppression circuitry is provided for the output triacs of this module.
To suppress high–voltage transients from the ac line, a metal–oxide
varistor (MOV) is provided between each set of terminals on the module.
In each output circuit, an RC network limits the magnitude of voltage
transients that may occur when a device is wired in parallel or series with
hard contacts.
Loads with inductive characteristics may require additional suppression
devices. The impedance characteristic of the load is the most important
factor in selecting a suppression device; thus no single suppression device
can be recommended for every possible load. See Table A for acceptable
suppression devices for typical loads.
Table A
Allen-Bradley Suppressors
Allen-Bradley Equipment
Suppressor Catalog Number
Motor Starter Bulletin 509
599-K04
1
Motor Starter Bulletin 709
1401-N10
1
Relay Bulletin 700 Type N or P
700-N5/700N9
2
Miscellaneous
700-N24
3
1 For starters with 120V ac coils
2 Maximum coil voltage 150V ac or dc
3 Bulletin 700-N24 is a universal surge suppressor. You can use it on electromagnetic
devices with the limitation of 35 sealed VA, 150V.
The isolated output module is powered by the power supply connected to
the I/O chassis backplane. The module requires a maximum current of
225mA from the +5V dc output of this supply. Total the current
requirements of this module with the other modules in the I/O chassis to
avoid overloading the supply or the I/O chassis backplane.
Power Requirements
