1771-CP1/AB IN STOCK& READY FOR SHIP
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Brand Name AB
Product reference 1771-CP1
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.
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.
Addressing Modes
Your Allen-Bradley processor can address its I/O in 2-slot, 1-slot or
1/2-slot I/O groups. You select the addressing method for the chassis
in which a processor or I/O adapter resides with the I/O chassis
backplane switch assembly. You make the selection for each chassis
independently, choosing one method of addressing for each chassis.
Fault Mode Selection
Some digital ac modules let you select last state or reset for input or
output failure configuration.
You select one of the two options by positioning a configuration plug
(jumper) on the edge of the printed circuit board. This plug is
independent of the last state switch on the I/O chassis backplane.
You set the jumper to determine whether the module’s inputs or
outputs do one of the following when the module detects a fault:
• remain in their last state
• are turned off (reset)
When the input module detects a fault, it’s input-image bits are put
into the state indicated by the jumper position. When the output
module detects a fault it’s outputs are put into the state indicated by
the jumper position. Refer to the table below for the state of inputs
or outputs after a module detects a fault, and jumper settings.
1771 digital ac input modules convert ac signals from user devices to
the appropriate logic level for use within the processor. Typical
input devices include:
• proximity switches
• limit switches
• selector switches
• float switches
• pushbutton switches
Allen-Bradley ac input modules are available with a wide range of
input terminals per module. The table below lists the Allen-Bradley
ac input modules, the image bits per module and addressing modes
you can use with the I/O chassis and chassis compatibility for each
input module.
Input Filtering
Input filtering limits the effect of voltage transients caused by
contact bounce and/or electrical noise. If not filtered, voltage
transients could produce false data.
Backplane circuits, module logic circuits, and the rest of the system
are protected from possible damage due to electrical transients by
opto-electrical isolation.
Certain modules allow you to configure filter times. Refer to the
individual module specifications in this document for more
information.
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