Allen-Bradley PLC-5 User Manual download pdf

1771sc-IFE32 32-Channel Analog

Input Module Configuration with

PLC-5 ControlNet Systems

Spectrum Controls, Inc Phone: (425) 746-9481

P.O. Box 5533 Fax: (425) 641-9473

Bellevue, WA 98006 Web Site: www.spectrumcontrols.com

Spectrum Controls’ 1771sc-IFE32 module is compatible with the popular Allen-Bradley 1771 I/O system, which is

widely used with PLC-5 programmable controllers. With the introduction of ControlNet as an I/O network for

Allen-Bradley PLC-5 controllers, the programming techniques for configuration and operation of these modules

have been adapted for use with PLC-5C15 ControlNet processors and with RSNetworx for ControlNet and RSLogix

5 ladder-logic editing software.

This application note is intended as an addendum to the 1771sc-IFE32 Owner’s Guide, which contains a thorough

explanation of the module’s features and specifications, and includes programming examples which are oriented

toward non-ControlNet PLC-5 installations. This note refers heavily to that document and should not be used

without it.

Prerequisites: Familiarity with Allen-Bradley PLC-5 programmable controllers and ladder logic.

Experience with RSNetworx for ControlNet configuration software, version 2.25.

Required 1771sc-IFE32 Owner’s Guide, publication number 0300179-01A

Literature: ControlNet PLC-5 User Manual, publication number 1785-6.5.22

Data Exchange Overview:

When a 1771sc-IFE32 module is installed in the local I/O chassis of a PLC-5 controller, or if it is in a Remote I/O

chassis with a 1771-ASB Remote I/O adapter, ladder logic instructions called Block Transfer Read (BTR) and Block

Transfer Write (BTW) are used to move blocks of data between the PLC-5 controller and the module.

When ControlNet is used instead of the Allen-Bradley Universal Remote I/O network (often called “RIO” or “Blue

Hose”), the chassis network adapter is a 1771-ACN15 or 1771-ACNR15 instead of a 1771-ASB. The size and

contents of the configuration and input data blocks remains the same, but the data exchange is configured using

either ControlNet scheduled or unscheduled messaging.

The unscheduled method of using ControlNet I/O Transfer (CIO) instructions in ladder logic may be chosen for

similarity to existing programs using BTR and BTW instructions.

Module input data may also be transferred periodically over ControlNet via scheduled messaging, which requires

the use of RSNetworx for ControlNet configuration software. Module configuration must still be done with CIO

instructions if scheduled messaging is used.

IMPORTANT: Although the Allen-Bradley ControlLogix system uses ControlNet as it’s I/O network, as of this

writing (January 2001) the ControlLogix processors do not support scheduled or unscheduled connections over

ControlNet to 1771 Analog modules. This functionality is planned to be added to the ControlLogix later in 2001.

Configuration (Output) Data:

The 1771sc-IFE32 input channels are software configurable, and therefore a block of configuration data must be

sent to the module every time it is to be reconfigured (always upon powerup, and whenever a configuration change

is made). Chapter 3 of the User’s Guide contains important information on the timing of such transfers, and presents

ladder logic for the PLC-2 and PLC-5 controllers using the Remote I/O network or a local chassis.

When using ControlNet, the same timing requirements should be observed. The module can require up to 6.5

seconds to configure and calibrate itself after a configuration block has been sent, therefore configuration blocks

should be sent only at startup or when the module needs to be reconfigured. This is the case regardless of whether

scheduled or unscheduled messaging is used to transfer input data from the module to the controller.

Three module configuration modes may be used, based on the number of configuration words sent:

5 words If all five words are zeros, a default configuration is used.

1 2 3 4 5 6 7

Summary of Contents

Page 1 - PLC-5 ControlNet Systems

1771sc-IFE32 32-Channel Analog Input Module Configuration with PLC-5 ControlNet Systems Spectrum Controls, Inc Phone: (425) 746-9481 P.O. Box 553

Page 2 - Phone: (425) 746-9481

1771sc-IFE32 32-Channel Analog Input Module Configuration with PLC-5 ControlNet Systems Page 2 of 7 Spectrum Controls, Inc Phone: (425) 746-9481 P.

Page 3

1771sc-IFE32 32-Channel Analog Input Module Configuration with PLC-5 ControlNet Systems Page 3 of 7 Spectrum Controls, Inc Phone: (425) 746-9481 P.

Page 4 - Module Input and Status Data

1771sc-IFE32 32-Channel Analog Input Module Configuration with PLC-5 ControlNet Systems Page 4 of 7Spectrum Controls, Inc Phone: (425) 746-9481 P.O

Page 5

1771sc-IFE32 32-Channel Analog Input Module Configuration with PLC-5 ControlNet Systems Page 5 of 7Spectrum Controls, Inc Phone: (425) 746-9481 P.O

Page 6 - Summary:

1771sc-IFE32 32-Channel Analog Input Module Configuration with PLC-5 ControlNet Systems Page 6 of 7Spectrum Controls, Inc Phone: (425) 746-9481 P.O

Page 7

1771sc-IFE32 32-Channel Analog Input Module Configuration with PLC-5 ControlNet Systems Page 7 of 7 Spectrum Controls, Inc Phone: (425) 746-9481 P

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