1771 Digital I/O AC Input and Output Modules Interfaces your ON/OFF devices to AllenBradley programmable
controllers within the 1771 Universal I/O structure. Allen-Bradley
digital ac I/O modules interface to ON/OFF devices such as limit
switches, pushbuttons, motor starters, pilot lights, and annunciators.
These modules are compatible with all current Allen-Bradley
programmable controllers. This saves on spare parts, system
engineering, inventory, and training costs.
Supports highpower operations. The ac solid-state family of digital
I/O modules meets requirements for applications from 10-276V ac.
These modules exhibit long life (20 million to over 100 million
operations).
Provides system protection and troubleshooting aids. The ac I/O
modules include electrical-optical isolation and filter circuits. To
help you troubleshoot your system, module indicators are provided
to show input or output status. AC/DC Input Module (Cat. No. 1771IA Series C, and 1771IA2) AC/DC Input Module (Cat. No. 1771IAD Series D) AC Input Module (Cat. No. 1771IAN) Isolated AC/DC Input Module (Cat. No.1771ID) Isolated AC/DC Input Module (Cat. No. 1771ID01) Isolated AC/DC Input Module (Cat. No 1771ID16) AC/DC Input Module (Cat. No. 1771IM) AC/DC Input Module (Cat. No. 1771IMD Series B) AC Input Module (Cat. No. 1771IN) AC/DC Input Module (Cat. No. 1771IND Series B) AC Output Module (Cat. No. 1771OA Series B) AC Output Module (Cat. No. 1771OAD Series C) AC Output Module (Cat. No. 1771OAN) Isolated AC Output Module (Cat. No. 1771OD Series C) Isolated AC Output Module (Cat. No. 1771OD16) Isolated AC Output Module (Cat. No. 1771ODD) Isolated AC Output Module (Cat. No. 1771ODZ) AC Output Module (Cat. No. 1771OM) AC Output Module (Cat. No. 1771OMD Series B) AC Output Module (Cat. No. 1771ON) AC Output Module (Cat. No. 1771OND Series B) Protected AC Output Module (Cat. No. 1771OP) Isolated AC Output Module (Cat. No. 1771OR Series B) . Support Services Technical Support Engineering and Field Services Technical Training Repair and Exchange Services System Compatibility
The individual specification sheets included in this document show
compatibility and use of the data table for each module.
Status Indicators
The front panel of each ac discrete I/O module contains status
indicators. Each status indicator shows the ON/OFF condition of an
individual input or output. Some modules have additional indicators
such as Fuse Blown and/or Triac Fail.
Keying
Plastic keying bands shipped with each I/O chassis let you key your
I/O slots to accept only one type of module. You can key any
backplane connector in an I/O chassis to receive your module except
for the leftmost connector, which is reserved for adapter or processor
modules.
Power Supply Requirements
Modules receive power through the 1771 I/O chassis backplane from
the associated chassis power supply. Total the current requirements
for all the modules in the chassis to avoid overloading the power
supply or the I/O chassis backplane.
Module Placement Guidelines
Group your modules to minimize adverse effects from radiated
electrical noise and/or heat.
• Group analog input and low voltage dc modules away from ac
modules or high voltage dc modules in the chassis to minimize
electrical noise interference.
• Place analog input modules and other I/O modules that are
sensitive to heat away from slot power supplies to minimize
adverse heat effects.
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