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1747-SN
Allen Bradley SLC500 Remote I/O Scanner Module

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2 year warranty 2 year warranty*

Worldwide delivery Worldwide delivery

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*Manufacturer's warranty does not apply

SLC500 Remote I/O Scanner Module
Description

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The Allen Bradley 1747-SN, is a remote I/O scanner module for the SLC 500 series of programable logic controllers. The RIO module enables communication between an SLC 500 processor (SLC 5/02 or later) and remotely located RIO compatible operator panels, 1746 I/O chassis and other control devices. The max distance of the communication is an expressive 10,000 feet or for metric readers, 3,048 meters. The RIO link between the devices consists of a single master (scanner) and multiple slave (adapters). Communication between devices occurs over twisted pair cable with the devices daisy-chained together.

Installing the device into your SLC-500 rack

The 1747-SN can reside in any slot of the local SLC chassis except for slot 0 which is usually reserved for the power supply module.The scanner can be configured for and transfer a maximum of 4 logical racks of discrete data on the RIO link. The scanner provides discrete I/O and block (Series B or later) transfers. Configurations allowed are any combination of quarter, half, three-quarter, or full logical rack devices.

Scanner image division

The scanner allows each adapter to use a fixed amount (user defined) of the scanner’s input and output image. Part of the SLC processor’s image is used by local I/O, the other portion is used by the scanner for remote I/O.

The scanner remote I/O image is divided into logical racks and further divided into logical groups. A full logical rack consists of eight input and eight output image words. A logical group consists of one input and one output word in a logical rack. Each logical group is assigned a number from 0 to 7.

How the AB 1747-SN scans

The scanner communicates with each logical device in a sequential fashion. First, the scanner initiates communication with a device by sending output data to the device. The device then responds by sending its input data back to the scanner, as illustrated below. You refer to this exchange as a discrete I/O transfer. After the scanner completes its discrete I/O transfer with the last configured network device, it begins another discrete I/O transfer with the first device. It is important to understand that the scanner transfers RIO data on a logical device basis not on an adapter basis. A logical device is a full logical rack or portion of a logical rack assigned to an adapter.

How the scanner interacts with the adapter

The scanner’s function is to continuously scan the adapters on the RIO link in a consecutive manner. This scan consists of one or more RIO
discrete transfers to each adapter on the RIO link.  RIO discrete transfers consist of the scanner sending output image data and communication commands to the adapter that instruct the adapter on how to control its output. (These include run, adapter reset, and reset decide commands.) The adapter responds by sending input data to the scanner. The scanner performs as many RIO discrete transfers as necessary to update the entire adapter image. If RIO discrete transfers do not occur, data is not exchanged between the scanner and adapter. RIO discrete transfers are asynchronous to the processor scan

PDFs

Le specifiche

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ManufacturerAllen Bradley
Range typeScanner Module
RangeSLC-500
UPC10662073876929
PDFs

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PDF SLC-500 Selection Guide
PDF Allen Bradley SLC-500 Brochure

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