Rockwell Automation 1770-KF3 User Manual

DH485 Communication Interface

(Cat. No. 1770KF3)

User’s Manual

Important User Information

Because of the variety of uses for this product and because of the differences between solid state products and electromechanical products, those responsible for applying and using this product must satisfy themselves as to the acceptability of each application and use of this product. For more information, refer to publication SGI-1.1 (Safety Guidelines For The Application, Installation And Maintenance of Solid State Control).

The illustrations, charts, and layout examples shown in this manual are intended solely to illustrate the text of this manual. Because of the many variables and requirements associated with any particular installation, Allen-Bradley Company cannot assume responsibility or liability for actual use based upon the illustrative uses and applications.

No patent liability is assumed by Allen-Bradley Company with respect to use of information, circuits, equipment, or software described in this text.

Reproduction of the contents of this manual, in whole or in part, without written permission of the Allen-Bradley Company is prohibited.

Statement of Compliance with Federal Communications Commission

Statement of Compliance with Canadian Department of Communications

Avis de Conformité aux normes du ministère des Communications du Canada

Warning and Caution Symbols

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of the Canadian Department of Communications. Operation in a residential area may cause unacceptable interference to radio and TV reception requiring the owner or operator to take whatever steps are necessary to correct the interference.

Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la classe A prescrites dans le Règlement sur le brouillage radioélectrique édicté par le ministère des Communications du Canada. L'exploitation faite en milieu résidential peut entraîner le brouillage des réceptions radio et télé, ce qui obligerait le propriétaire ou l'opérateur à prendre les dispositions nécessaires pour en éliminer les causes.

Throughout this manual, we make notes to alert you to possible injury to people or damage to equipment under specific circumstances.

WARNING: Tells readers where people may be harmed if procedures are not followed properly.

CAUTION:

loss can occur if procedures are not followed properly.

Warnings and Cautions:

identify a possible trouble spot tell what causes the trouble give the result of improper action tell the reader how to avoid trouble

Tells readers where machinery may be damaged or economic

WARNING: No user serviceable parts or adjustments inside module.

Refer servicing to qualified personnel.

 1991 Allen-Bradley Company, Inc.

IBM and AT are registered trademarks of the International Business Machine Corporation. PLC is a registered trademark of Allen-Bradley Company, Inc.

Manual Overview P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Audience P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface

Manual

Overview

Audience

Related Publications

This manual:

describes the features and capabilities of the 1770-KF3 tells you how to install, configure, and operate your 1770-KF3 gives troubleshooting tips on diagnosing problems defines the specifications of the 1770-KF3

Read this manual if you are installing and configuring a 1770-KF3 Interface Module for use with a DH-485 network.

You should be familiar with:

Allen-Bradley SLC 500 series of programmable controllers Allen-Bradley DH-485 networks

Publication Publication Number

Data Highway/Data Highway Plus/DH-485 1770-6.5.16 Protocol and Command Set Manual

SLC 500 Advanced Programming Software Manual 1747-801

Interface Connections

To install the KF3, follow these steps:

1. Define your network needs.

2. Construct the necessary cables.

3. Ground and terminate your network correctly.

4. Determine the correct voltage for your application and set the KF3’s

voltage selector. Change power cord if necessary.

5. Check the KF3’s default configuration parameters and change those

which are not suitable for your application.

Figure 2.1 shows the back panel of the KF3, including its two communication connectors. The connector labelled RS-232 Computer connects to the host computer via an RS-232C cable. The connector labelled DH-485 connects to the DH-485 network.

Figure 2.1 KF3

Back Panel

115V/230V

Selector

Voltage

Power Switch

AC power connector (115V/230V)

Fuses

FUSES: 0.1A 250V

TYPE 5mm X 20MM

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK

OF FIRE REPLACE ONLY

WITH THE SAME TYPE AND RA

TING OF FUSE. CAUTION: DOUBLEFOLD NEUTRAL FUSES

DH485 connector links to DH485 network

RS232C connector links to host computer via RS232C cable

21

Chapter 2

Installing the KF3

DH485 Cabling Considerations

Depending on your application, you can use the KF3 module to communicate with a single station via a point-to-point link, or with multiple DH-485 stations (for example, the SLC 500 family of programmable controllers), via the DH-485 network.

You must construct the necessary cable or cables for each application. Use a jacketed and shielded cable with two twisted wire pairs and a drain wire. One pair provides a balanced signal line; one wire of the other pair serves as a common signal reference for all nodes on the link. The shield reduces the effect of electromagnetic noise from the industrial environment. Belden #9842 cable is recommended.

The pinouts for the KF3’s DH-485 connector are shown in Figure 2.2.

Figure 2.2

Pinouts

KF3

FUSES: 0.1A 250V TYPE 5mm X 20MM

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK

OF FIRE REPLACE ONLY WITH THE SAME TYPE AND RA

TING OF FUSE. CAUTION: DOUBLEFOLD NEUTRAL FUSES

22

Grounding and Terminating the Network

The precise configuration of the cable connectors is determined by their position on the network.

Connections between intermediate nodes (nodes that are not at either end of the network) require no jumpers. Table 2.A shows the wire and terminal connections for a cable linking any two intermediate nodes.

Chapter 2

Installing the KF3

Table 2.A Wire/Terminal

For this Wire/Pair Connect this Wire To this Terminal

Shield/Drain Nonjacketed Terminal 2 - Shield

Black/White Black Wire

Black/Red Black Wire

Connections for Imtermediate Nodes

White Wire

Red Wire

Cut back - No connection

Terminal 3 (Signal Ground)

Terminal 4 (Data A)

Terminal 5 (Data B)

The nodes at each end of the network must be terminated. Install a jumper wire between terminals 5 and 6 to enable the impedance built into the module.

One (not both) of the nodes at the end of the network must have an earth ground connection for the communication cable shield. For the node at one end of the network, whether it is the KF3 or some other device, connect the shield to ground by installing a jumper wire between terminals 1 and 2 of the terminal block.

CAUTION: Be sure no other node on the network has its shield connected to ground.

Figure 2.3 illustrates proper jumper connections for end nodes.

Figure 2.3

Connections for End Nodes

Jumper

ground shield

Jumper to terminate node

KF3 on one end of the link

* The black wire of the white/black pair should be cut back (no connection).

Jumper to terminate node

SLC 500 or other device on the other end of the link

23

Chapter 2

Installing the KF3

Host Computer

RS232C Cable

Connecting via a DH485 Link (PointtoPoint Configuration)

Figure 2.4 shows a point-to-point link consisting of a single SLC 500 programmable controller and one host computer station.

Figure 2.4

PointtoPoint DH485 Link

DH485

Cable

Belden #9842

Link

KF3

Coupler 1747AIC

1747C1

1 Cable

SLC 500 Controller

This configuration requires a KF3 and one link coupler. The SLC 500 controller is connected to the link coupler with a 1747-C11 cable. The KF3 is connected directly to the link coupler. In this topology, both the KF3 and the SLC 500 are end nodes.

Construct a cable to attach the DH-485 connector on the back of the KF3 module to the link coupler. Figure 2.5 shows the connection for a point-to-point DH-485 application. The shield ground could be at either end, but must be at one end, and one end only.

Figure 2.5 Connection

for KF3 and Single SLC

Jumper shield connector

KF3 on one end of the link

* The black wire of the white/black pair should be cut back (no connection).

to ground

Jumper to terminate node

SLC 500 or other device at the other end of the link

24

Chapter 2

Installing the KF3

Connecting to a DH485 Network (MultiPoint Configuration)

Figure 2.6 shows a network consisting of three SLC 500 programmable controllers and one host computer station.

RS232C Cable

Host Computer

Figure 2.6 Connecting

KF3

to Multiple SLC 500s via the DH485 Network

Link Coupler 1747AIC

1747C1

DH485

Cable

Belden #9842

Link Coupler 1747AIC

1747C1

Link Coupler 1747AIC

1747C1

1 Cable

This configuration requires the KF3 and three link couplers:

SLC 500 Controller

one SLC 500 family controller is connected to each of the link couplers

with a 1747-C11 cable

the KF3 is connected to the network at one of the link couplers

the DH-485 cable consists of three segments of cable daisy-chained to

the link couplers and the KF3

The connection between the first node (the KF3) and the link coupler to the second node is shown in Figure 2.7.

25

Chapter 2

Installing the KF3

Jumper

to ground

shield connector

1770KF3 on one end of the link

Figure 2.7 Connection

Jumper to terminate node

* The black wire of the white/black pair should be cut back (no connection).

for First Segment of a Multidrop Network

DH485 Cable

Link coupler to first SLC 500

The cable connecting the second and third nodes of the multidrop network (neither of which is an end station) is shown in Figure 2.8.

Figure 2.8 Connection

Between Two Intermediate Nodes

DEVICE

Cable Belden #9842

o Link Coupler

Red/Black

* The black wire of the white/black pair should be cut back (no connection).

Pair

The connection between the third and fourth (end) node is shown in Figure 2.9.

Cable Belden #9842

FROM

DEVICE

26

Chapter 2

Installing the KF3

DH485 Cable

Figure 2.9 Connection

Third

node

* The black wire of the white/black pair should be cut back (no connection).

for Last Segment of a Multidrop Network

Jumper to terminate node

Fourth node on the end of the multidrop network

Installing the DH485 Cable

The DH-485 cable consists of a number of daisy-chained segments. The total length of the combined segments must not exceed 4,000 feet. Cut the cable segments long enough to route from one node to the next, allowing sufficient slack to prevent strain on the connectors. Provide strain relief for the cable after it is plugged in to prevent the cable wires from breaking.

Link Coupler 1747AIC

Figure 2.10

Connection on a DH485 Link

Cable

BELDEN

#9842

KF3

Connector (Phoenix

MSTB2.5/6ST

BELDEN

#9842

Link Coupler 1747AIC

AU)

27

Chapter 2

Installing the KF3

RS232C Cabling Considerations

Cabling for the RS-232C connector of the KF3 will vary depending on your application. The pinouts for this connector are given in Table 2.B.

Table 2.B RS232C

Signal Abbreviation Direction Pin No. Meaning

Chassis Ground - - 1 The cable shield must be connected to chassis ground at one

Transmit Data TXD Output 2 RS232C serialized data output from the module.

Receive Data RXD Input 3 RS232C serialized data input to the module.

Request to Send RTS Output 4 A request from the module to the modem to prepare to

Clear to Send CTS Input 5 A signal from the modem to the module that indicates the

Data Set Ready DSR Input 6 A signal from the modem to the module that indicates the

Connector Pinouts

end only.

transmit. With fullduplex protocol, RTS is always asserted. With halfduplex protocol, it is turned on when the module has permission to transmit, otherwise it is off.

carrier is stable and the modem is ready to transmit. The module will not transmit until CTS is on. If CTS is turned off during transmission, the module will stop transmitting until CTS is restored.

phone is offhook. It is the modem's answer to DTR. The module will not transmit or receive unless DSR is on. If the modem does not control DSR properly, DSR must be jumpered to a high signal at the module. (It can be jumpered to DTR.)

Signal Ground GND - 7 Signal ground - a reference point for the data signals.

Data Carrier Detect DCD Input 8 A signal from the modem to the module to indicate that the

carrier from another modem is being sensed on the phone line. It will not be asserted unless the phone is offhook. Data will not be received by the KF3 unless DCD is on. With fullduplex protocol, the module will not transmit unless DCD is on. If the modem does not control DCD properly, DCD must be jumpered to DTR at the module.

Data Terminal Ready DTR Output 20 A signal from the module to the modem to connect to the

phone line (i.e., pick up the phone"). The module will assert DTR all the time except during the phone hangup sequence.

Modems built to North American standards will not respond to DTR until the phone rings. The KF3 module will not work correctly with modems which always pick up the phone upon receiving DTR, whether the phone is ringing or not.

28

Chapter 2

Installing the KF3

Use Belden #8723 (or equivalent) cable to construct a cable to connect the KF3 to a computer.

Important: The length must not exceed 50 feet, and the cable shield must be connected to chassis ground (using Pin 1) at the KF3 end only.

There are various cabling options depending on whether or not your application makes use of handshake signals, whether or not you are connecting to a 9-pin serial port for an IBM AT, and whether or not your computer uses standard IBM pinouts. Figures 2.11 through 2.16 are for IBM computers with either 9- or 25-pin connectors. If your computer has a different pinout, construct a cable using the appropriate signal names for your computer.

If you are not using handshake signals, use the three wire connections shown in Figures 2.11 or 2.12.

Figure 2.11 ThreeWire

Connection to IBM Computer (25 pin)

KF3 Computer

TXD 2

RXD 3

GND 7

Shield

Figure 2.12 ThreeW

ire Connection to IBM Computer (9 pin)

KF3 Computer

TXD 2

RXD 3

Shield

3 RXD

2 TXD

7 GND

2 RXD

3 TXD

GND 7

5 GND

29

Chapter 2

Installing the KF3

If your computer requires active DSR and CTS signals, add jumpers to the computer connections as shown in Figures 2.13 and 2.14.

Figure 2.13

Positions for DSR and CTS Lines (25 pin)

Jumper

KF3 Computer

TXD 2

RXD 3

GND 7

Shield

Figure 2.14 Jumper Positions for DSR and CTS Lines (9 pin)

KF3 Computer

Shield

3 RXD

2 TXD

7 GND

4 RTS

5 CTS

6 DSR

8 DCD

20 DTR

210

TXD 2

RXD 3

GND 7

2 RXD

3 TXD

5 GND

7 RTS

8 CTS

6 DSR

1 DCD

4 DTR

+ 41 hidden pages

Rockwell Automation 1770-KF3 User Manual

Important User Information

Table of Contents

Preface

Interface Connections