Rockwell-automation 1791-XXXX Discrete I/O AC and DC Block I/O Input a Manual de usuario descargar pdf (Pagina 57)

Installing Block I/O

Chapter 3

3-38

Certain products are not compatible with extended node capabilities

obtained with the use of 82 ohm terminators. Table 3.D lists those products

that are not compatible.

Table 3.D

Noncompatible

Products

Device Series

Scanners



1771SN All

1772SD All

1772SD2 All

1775SR All

1775S4A All

1775S4B All

Adapters  1771AS All

1771ASB Series A

1771DCM All

Miscellaneous  1771AF All

1771AF1 All

The remote I/O link can operate at three speeds: 57.6K, 115.2K or 230.4K

bits/s. The selection of link speed is dependent on the scanner/processor

used, throughput requirements, distance required and the type of remote

I/O devices being used.

Throughput Requirements

The throughput, a portion of which is I/O scan time, must be balanced

against the distance requirements for the application. The typical discrete

I/O scan time is shown in Table 3.E below. Use these values along with

your processor/scanner manual to determine system throughput.

Table 3.E

I/O

Scan Time vs. Remote I/O Link Distance

57.6K Bits/s 115.2K Bits/s 230.4K Bits/s

Typical Discrete I/O Scan

Time (each block)

10ms 7.0ms 3ms

Remote I/O link distance 10,000 ft. 5,000 ft. 2,500 ft.

Compatibility

of 1771 I/O

Products with Extended

Node Numbers

Selecting Remote I/O Link

Speed

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 97 98

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