Allen-Bradley 1775-S4A Manuel d'utilisation

I/O Scanner Modules

Product Data

AllenBradley

I/O Scanner Modules

(Cat. No. 1775-S4A, -S4B)

Product Data

The I/O scanner modules provide I/O and RS-232-C communication

channels for the PLC-3 programmable controller. The two scanner modules

are:

I/O Scanner-Programmer Interface Module (cat. no.1775-S4A

I/O Scanner-Message Handling Module (cat. no. 1775-S4B)

Table Aoutlines the benefits, features, and functions for these modules.

Description

I/O Scanner Modules

Product Data

Table

Benefits, Features, and Functions of the PLC3 Scanner Modules

Benefits Features Functions

High speed I/O communication with up to 2,048

inputs and 2,048 outputs per scanner

Ability to execute a faster scan for selected I/O

chassis

Ladder diagram programming or report

generation capability

Easy troubleshooting

Easy identification of PLC3 system with multiple

scanner modules

Backup system capability

Efficient production floor planning for:

GI/O communication

GPeertopeer communication

GBackup communication

Four I/O communication channels

I/O scan priority

RS232C communication channel

Status LED indicators

Thumbwheel switch

Backup connector

Terminal swing arm for extensive cabling

Communicate with I/O Adapter Modules (cat no

1771AS) in I/O chassis You can connect up to

16 I/O chassis to one I/O channel on the

scanner

Scan the I/O chassis according to a sequence

that you select

Communicates with an Industrial Terminal (cat

no 1770T4) or an RS232C compatible device

Keep you informed of the general scanner

module status and the active status of each I/O

communication channel

Distinguishes one scanner from another The

PLC3 processor requires one 1775S4A

scanner with its thumbwheel switch set to 1

Transfers control over to a backup PLC3

processor if a fault shuts down the primary

PLC3 processor

Makes connections to:

GBulletin 1771 I/O chassis up to 10,000 cable

feet away from scanner via Twinaxial Cable

(cat no 1770CD)

GCommunication channels on 1775S4A

scanners in up to 6 separate PLC3 systems

GCommunication channel on a 1775S4A

scanner in another PLC3 system

I/O Scanner Modules

Product Data

The following two sections of this publication explain the functional

differences between the 1775-S4A scanner and the 1775-S4B scanner.

These differences are summarized in table B. This publication also

explains the hardware components on the scanners.

Table

Functional Differences Between 1775S4A and 1775S4B Scanners

Type of Scanner

Function Number

One

1775S4A

Another

1775S4A

1775S4B

Required for PLC3 processor operation

I/O Scanning with four I/O channels

Backup or peertopeer communication capability

Required for PLC3 backup operation

Programming interface with channel 5

Programming interface with channel 0 on PLC3

front panel

Report generation interface with channel 5

Yes

Yes1

Yes

1To Operate channel 5 on the number one 1775S4A scanner you must make I/O channel 4

inactive through the PLC3 LIST function.

You can find detailed information on these scanners in:

I/O Scanner-Programmer Interface Module User’s Manual (publication

1775-6.5.2, formerly 1775-805)

I/O Scanner-Message Handling Module User’s Manual (publication

1775-6.5.3, formerly 1775-806)

The 1775-S4A scanner is a required module for the PLC-3 programmable

controller. When you are setting up your PLC-3 system, you must insert a

1775-S4A scanner into the PLC-3 Main Processor Chassis (cat. no.

1775-A1) and set its thumbwheel switch to one. This number one

1775-S4A scanner communicates between the PLC-3 programmable

controller and:

the industrial terminal for programming interface

1771I/O chassis for I/O scanning interface

a backup PLC-3 processor that takes control over the outputs if the

primary PLC-3 processor faults

up to six PLC-3 processors for peer-to-peer communication

Using

the 1775S4A Scanner

I/O Scanner Modules

Product Data

Programming Interface

The 1775-S4A scanner provides an RS-232-C compatible channel (channel

5) that can communicate with the industrial terminal. You can use the

industrial terminal to:

enter and monitor ladder diagram program instructions

enter and monitor data table values

force inputs and outputs

operate the PLC-3 LIST function

load and record ladder diagram programs with a Data Cartridge

Recorder (cat. no. 1770-SB) or Data Cassette Recorder (cat. no.

1770-SA)

print out ladder diagram program through channel C interface to a

printer

The number one 1775-S4A scanner supports operation of channel 0 on the

PLC-3 front panel. If you are using channel 5 on the number one

1775-S4A scanner, you must make I/O channel 4 inactive through the

PLC-3 LIST function.

Additionally, through LIST selections for the number one 1775-S4A

scanner, you can configure channel 0 on the PLC-3 front panel for

communication with the industrial terminal or an RS-232-C compatible

device.

I/O Scanning Interface

The 1775-S4A scanner provides terminals for four separate I/O

communication channels. These channels can communicate with I/O

adapter modules in I/O chassis. In scanning these I/O channels, the

1775-S4A scanner:

reads the status of output image table words from the data table and

transmits this data to update the status of the terminals on the

corresponding output module groups

receives the status from the terminals on the input module groups and

writes this data into the corresponding input image table word in the

data table

You can connect up to 16 I/O chassis on a single I/O channel. Through the

PLC-3 LIST function, you can select the sequence that the 1775-S4A

scanner scans the I/O chassis. If an I/O chassis requires a faster update

time, you can list the chassis more than once in the sequence.

I/O Scanner Modules

Product Data

Backup Communication

Through LIST selections for the 1775-S4A scanner, you can configure an

I/O channel for a backup communication function. In operating this

function, the I/O channel of a 1775-S4A scanner in the primary PLC-3

processor is connected to the same channel of a 1775-S4A scanner in the

backup PLC-3 processor. An input file receives data from the backup

processor. An output file sends data to the backup processor.

By cabling between the connectors labeled BACK UP on a number one

1775-S4A scanner in the primary PLC-3 processor chassis and a number

one 1775-S4A scanner in the backup PLC-3 processor chassis, you can set

up a PLC-3 backup system. In this system, if a fault disables the PLC-3

processor, the second PLC-3 processor can take control of the outputs. For

detailed information on the PLC-3 backup system, refer to the PLC-3

Programmable Controller Backup Concepts Manual (publication

1775-6.3.1, formerly 1775-803).

PeertoPeer Communication

Through LIST selections for the 1775-S4A scanner, you can configure an

I/O channel for peer-to-peer communication. In this function, you connect

the I/O channel of a 1775-S4A scanner in one PLC-3 processor to the same

channel of a 1775-S4A scanner in each of up to 6 PLC-3 processors. You

must designate one PLC-3 processor as the master of this communication

channel. The other PLC-3 processors on the channel act as slaves.

In peer-to-peer communication, the master communicates with each slave.

Through the LIST function you select a separate file in the master PLC-3

processor for each slave. This file is the source for data that transfers to the

slave PLC-3 processor(s). You also select a file in each slave PLC-3

processor that receives the data.

Peer-to-peer communication allows PLC-3 processors to exchange data

such as part counts and production status information.

You can add up to 14 additional 1775-S4A scanners for additional I/O

communication and RS-232-C capability. Each additional 1775-S4A

scanner provides four I/O communication channels and a RS-232-C

communication channel.

Additional

1775S4A Scanners

I/O Scanner Modules

Product Data

The 1775-S4B scanner is an optional module for the PLC-3 programmable

controller. The 1775-S4B scanner communications between the PLC-3

programmable controller and:

RS-232-C compatible devices for report generation interface

1771 I/O chassis for I/O scanning interface

Report Generation Interfaces

The 1775-S4B scanner provides an RS-232-C compatible channel (channel

5) that can communicate with data terminals, computers, printers, modems,

and other RS-232-C compatible devices. You can use these devices to

program in the report generation language available with the 1775-S4B

scanner.

By using the report generation language, you can enter and store messages

from the data terminal. You can execute these messages through the data

terminal or by using the MSG instruction in the ladder diagram program.

Report generation allows you to format text and data for display on a CRT

screen or printer. You can also display graphic presentations on a CRT

screen.

I/O Scanning Interface

The 1775-S4B scanner has terminals for four separate I/O communication

channels. You can use these channels for I/O scanning the same as the

1775-S4A scanner.

Both scanner modules have the following hardware components (figure 1):

self-test indicators

thumbwheel switch

status indicators for the I/O channels

backup connector

channel 5 connector

terminal swing arm

We describe these components in the following sections.

Using

the 1775S4B Scanner

Looking at the PLC3 Scanner

Modules

I/O Scanner Modules

Product Data

Figure

Hardware Features on the PLC3 Scanner Modules

Selftest Indicators

At the top of the scanner’s front edge, LED indicators labeled PASS and

FAIL keep you informed on the general condition of the scanner. These

indicators have the following meanings:

PASS (green) FAIL (red) Meaning

Off

Normal operation

Module fault

Powerup or system reset

PLC3 processor is

turned off

Thumbwheel Switch

The thumbwheel switch is below the self-test indicators. Setting it at a

unique number (1 to 15) enables the PLC-3 processor to distinguish one

scanner from another. That is, a 1775-S4A scanner and a 1775-S4B

scanner in the PLC-3 processor chassis can be set at the same number.

CAUTION: Do not change the thumbwheel setting on a

scanner module while PLC-3 processor power is on. Equipment

damage could result.

I/O Scanner Modules

Product Data

Remember, you must have a 1775-S4A scanner with its thumbwheel

switch set at 1 in the PLC-3 main processor chassis.

I/O Channel Status Indicators

Below the thumbwheel switch are four green LEDs labeled:

CH1

CH2

CH3

CH4

Each LED corresponds to one of the four I/O communication channels.

Depending on your use for the I/O communication channel, each indicator

has the following meanings:

If you are using the channel for I/O scanning with a 1775-S4A or

1775-S4B scanner:

If the LED is: Then:

On Communication between the scanner module and the I/O chassis on the

corresponding I/O channel is properly established

Flashing There is a fault on one or more of the I/O chassis on the corresponding I/O

channel

Off No I/O chassis are connected to the corresponding I/O channel or the channel is

inactive

If you are using the channel for peer to peer communication with

1775-S4A scanners:

If the LED is: Then:

On The channel is functioning properly.

Flashing The in put file that receives the data from a slave PLC3 processor is too small.

Off There is a communication problem along the channel or the channel is inactive.

If you are using the channel for backup communication with 1775-S4A

scanners:

If the LED is: Then:

The channel is functioning properly.

Flashing The input file that receives the data from the backup PLC3 processor is too

small.

Off The channel has not received data during the last 200ms or the channel is

inactive.

I/O Scanner Modules

Product Data

Backup Connector

Below the I/O channel status indicators is a backup connector. You can use

this connector to set up the backup system capability for switching control

over the outputs. This connector is only used for 1775-S4A scanner

number one.

Channel 5 Connector

Below the backup connector is a 25-pin D-shell connector labeled CH5.

This connector provides communication with:

an industrial terminal for ladder diagram programming and configuring

the PLC-3 system if you are using a 1775-S4A scanner

an RS-232-C compatible device for report generation if you are using a

1775-S4B scanner

To use channel 5 on 1775-S4A scanner number one, you must make I/O

channel 4 inactive through the PLC-3 LIST function.

Terminal Arm Swing

Near the bottom of the scanner module is a Terminal Swing Arm (cat. no.

1775-WA). This swing arm contains the connection for I/O communication

channels 1 to 4. Functions of these channels include:

Function Compatibility

Scanning

I/O

1775S4A or 1775S4B scanners

Peer to peer communication 1775S4A scanner only

Backup communication 1775S4A scanner only

Electrostatic Discharge

Under some conditions, electrostatic discharge can degrade performance or

damage an I/O scanner module. If you observe the following precautions

you can guard against electrostatic damage.

Touch a grounded object to discharge yourself before handling the

module.

Do not touch the backplane connector or connector pins.

When not in use, keep the module in its static-shield bag.

I/O Scanner Modules

Product Data

Specifications

Location

GSingle slot in a PLC3 processor chassis

Functions

GI/O interface

GRS232C interface for ladder diagram

programming

GRS232C interface for report generation

I/O Capacity

G2,048 inputs and 2,048 outputs

Channels Per Scanner

G4 I/O communication

G1 RS232C communication

Communication Rate

G57.6 or 115.2 kbaud (I/O channel)

G110 baud to 19.2 kbaud

(RS232C channel)

I/O Channel Cable Length

G10,000 cable feet (max)

Nominal I/O Scan Times Per I/O Adapter

G5.5 to 6.5ms for 1 channel

G6ms for 2 channels

G6ms for 3 channels

G6.0 to 6.5ms for 4 channels

Environmental Conditions

GOperational Temperature:

0 to 60°C (32 to 140°F)

GStorage Temperature:

40 to 85°C (40 to 185°F)

GRelative Humidity:

5 to 95% (without condensation)

With offices in major cities worldwide

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HEADQUARTERS

Allen-Bradley

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Milwaukee, WI 53204 USA

Tel: (1) 414 382-2000

Telex: 43 11 016

FAX: (1) 414 382-4444

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HEADQUARTERS

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Cambridge, Ontario N1R

5X1

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Tel: (1) 519 623-1810

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LATIN AMERICA

HEADQUARTERS

Allen-Bradley

1201 South Second Street

Milwaukee, WI 53204 USA

Tel: (1) 414 382-2000

Telex: 43 11 016

FAX: (1) 414 382-2400

As a subsidiary of Rockwell International, one of the world’s largest technology

companies — Allen-Bradley meets today’s challenges of industrial automation with over

85 years of practical plant-floor experience. More than 11,000 employees throughout the

world design, manufacture and apply a wide range of control and automation products

and supporting services to help our customers continuously improve quality, productivity

and time to market. These products and services not only control individual machines but

integrate the manufacturing process, while providing access to vital plant floor data that

can be used to support decision-making throughout the enterprise.

Publication 1775-2.5 — October, 1984

Supersedes Publication 1775-906 — May, 1982 PLC is a registered trademark of Allen-Bradley Company

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