Rockwell Automation 1771-ODD INSTL.DATA AC/DC (220/44)INPUT - Manual (Page 3)

AC (120V) Isolated Output Module, 16 Outputs 3
Publication 1771Ć5.20 - January 1999
The switching device in the output circuit is a solid-state triac. There
is a small leakage current in the off state due to both triac and
capacitive characteristics. The maximum leakage current per output
is 3mA at 138V ac. Nominal leakage current is 1.5mA. The on-state
voltage drop across the output terminals will not exceed 1.5V ac
at 2A.
The 1771-ODD/B module is designed for a 10mA minimum current
on each output circuit. The total continuous current the module
supports is 8A (2A maximum per channel). If this rating is
exceeded, the module overheats and damage may occur.
Suppression
Surge suppression circuitry is provided for the output triacs in 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 NO TAG for acceptable suppression devices for typical
loads.
Table A
AllenĆBradley Suppressors
AllenĆBradley Equipment Suppressor Catalog Number
Motor Starter Bulletin 509 599ĆK04 1
Motor Starter Bulletin 709 1401ĆN10 1
Relay Bulletin 700 Type N or P 700N5/700N9
Miscellaneous 700ĆN24 2
1 For starters with 120V AC coils
2 Bulletin 700ĆN24 is a universal surge suppressor. You can use it on electromagnetic devices with the limitation of
35 sealedVA, 150V.
Determining Module Placement in the I/O Chassis
You can place your module in any I/O module slot of the I/O chassis
except for the left-most slot. The left-most slot is reserved for
programmable controller processors or adapter modules. Group your
modules to minimize adverse effects from radiated electrical noise
and/or heat. We recommend the following: