1746-IA8/AB IN STOCK& READY FOR SHIP
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Product reference 1746-IA8
The Allen-Bradley 1746-IA8 is a SLC 500 Digital AC Input Module. This Digital AC Input Module has a Voltage Range of 85-132 Volts AC and 8 Inputs with a Backplane Current (5 Volts DC) of 50 milliamps.
The Allen-Bradley 1746-IA8 is a programmable logic controller module. It is an 8-channel digital AC input module for a programmable controller and it has general-purpose input applications. The operating voltage ranges from 85 - 132V AC. The controller module has a status display and an open-style enclosure. The isolation voltage of the controller is 500V DC at the communication circuit and 1500V AC at the back-plane. The mounting is a chassis type and has 8 channels. The voltage rating of the controller module is 100 - 120V AC. It has a 32 - 140 degrees Fahrenheit operating temperature and it has all the standard features. The 1746-IA8 logic module weighs 0.23 kg and has a 5" x 2" x 6" (13 cm x 5 cm x 15 cm) dimensions.
The 1746-IA8 controller module has a 47 - 63 Hz operating frequency. It has a back-plane current of 50 mA at 5V and one of 0 mA at 24 V. The module's nominal input current reaches 12 mA at 120V AC. The maximum Off-state current is 2 mA with a max inrush current time duration of 0.5 ms. The signal ON delay is at its maximum at 35 ms and signal OFF delay is at max at 45 ms. It has 0.27 Watts per point with 0.25 Watts minimal thermal dissipation and 2.4 Watts maximum thermal dissipation. It has a max OFF state voltage of 30V AC and maximum OFF-state current of 2 mA with an inrush current of 0.8 A max.
The 1746-IA8 SLC 500 is a 8-Channel General-Purpose 120V AC Digital Input
Module. Operating voltage for 1746IA8 is 85...132V AC. 1746-IA8 contains 8
inputs application is general purpose.
1746 Analog I/O
Modules
Analog I/O modules feature user-selectable voltage or current inputs, backplane
isolation, removable terminal blocks, and diagnostic feedback.
The 1746-NI4, 1746-NIO4I, and 1746-NIO4V input channels are filtered to reject high
frequency noise and provide 14- to 16-bit (range-dependent) resolution.
All 4-channel analog output modules provide 14-bit resolution and a 2.5 ms
conversion rate.
The 1746-FIO4I and 1746-FIO4V modules have less input filtering and can sense
more rapidly changing inputs. However, their input resolution is only 12-bit. Because
the input filter on the 1746-FIO4I or 1746-FIO4V module may pass more electrical
noise, you should thoroughly ground and shield the input transducer, its power
supply, and cables.
The 1746-NI8 module provides high accuracy and fast analog signal conversion. The
1746-NI8, 1746-NI16I and 1746-NI16V modules are high density analog input
modules that are software configurable.
The 1746-NO8I (current output) and 1746-NO8V (voltage output) modules are high
density, analog output modules that provide 8 individually configurable output
channels with 16-bit resolution.
Local Systems
At minimum, a modular hardware SLC 500 control system consists of a processor
module and I/O modules in a single 1746 chassis with a power supply
You can configure a system with one, two, or three local chassis, for a maximum total
of 30 local I/O or communication modules. You connect multiple local chassis
together with chassis interconnect cables to extend the backplane signal lines from
one chassis to another.
Distributed Systems
More complex systems can use:
distributed I/O.
multiple controllers joined across networks.
I/O in multiple platforms that are distributed in many locations and connected over
multiple I/O links.
Choose the processor module with the on-board communication ports you need. You
optionally add modules to provide additional communication ports for the processor.
For I/O in locations remote from the processor, you can choose between a ControlNet,
DeviceNet, or Univeral I/O link. A communication interface module is required in
both the local and remote chassis.
Depending upon the communication ports available on your particular SLC control
system, you can select operator interfaces that are compatible.
Laying Out the System
Lay out the system by determining the amount of I/O necessary, the network
configurations, and the placement of components in each location. Decide at this time
whether each chassis will have it’s own controller or a networked solution.
SLC 500 processors are available with a large range of memory sizes (1 K through 64
K) and can control up to 4096 input and 4096 output signals. All modular processors
except the SLC 5/01 processor are capable of controlling remotely located I/O. By
adding an I/O scanner module, you can use these processors to control/monitor these
remotely located I/O across ControlNet, DeviceNet, and Universal Remote I/O links.
SLC 500 processors are single-slot modules that you place into the left-most slot of a
1746 I/O chassis. For I/O in a location remote from the processor, the I/O adapter is
a single-slot module that you place in the left-most slot of the I/O chassis. SLC 500
modular systems provide separate power supplies which must be mounted directly on
the left end of the 1746 I/O chassis.
The 1746 I/O chassis are designed for back-panel mounting and available in sizes of
4, 7, 10, or 13 module slots. The 1746 I/O modules are available in densities up to a
maximum of 32 channels per module.
Publication 1747-SG001D-EN-P — January 2009
6
Communications
Evaluate what communications need to occur. Knowing your communications
requirements will help you determine which processor and which communications
devices your application might require.
An SLC processor communicates across the 1746 backplane to 1746 I/O modules in
the same chassis in which the processor resides. Various models of SLC processors
have various on-board ports for communication with other processors or computers.
Also, separate modules are available to provide additional communication ports for
communication with other processors, computers, and remotely located I/O.
Each processor has one or two built-in ports for either EtherNet/IP, DH+, DH-485, or
RS-232 (DF1, ASCII, or DH-485 protocol) communication.
In addition to the on-board ports available with SLC processors, you have the option
of providing another communication port for an SLC processor by adding a
communication module.
Adapter modules for 1746 I/O are available for ControlNet and Universal Remote I/O
links. An I/O adapter module in a chassis with I/O modules interfaces the I/O modules
with the I/O link for communication with a scanner port for a processor at another
location.
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