Rockwell Automation 1791-XXXX User Manual

Page 1

1791 Analog Block I/O Input/Output Modules

User Manual

Page 2

Important User Information

Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.

The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for example. Since there are many variables and requirements associated with any particular installation, Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI–1.1, “Safety Guidelines For The Application, Installation and Maintenance of Solid State Control” (available from your local Allen-Bradley office) describes some important differences between solid-state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication.

Reproduction of the contents of this copyrighted publication, in whole or in part, without written permission of Allen–Bradley Company, Inc. is prohibited.

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

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage or economic loss.

Attention helps you:

- Identify a hazard

- Avoid the hazard

- recognize the consequences

Important: Identifies information that is critical for successful application and understanding of the product.

Important: We recommend you frequently backup your application programs on appropriate storage medium to avoid possible data loss.

Page 3

Summary of Changes

Summary of Changes

Summary of Changes

This release of the publication contains new and updated information from the last release.

New Information

This release includes information on new block I/O modules now available. This information was not included in the previous release of this publication. The modules are:

1791-NDV – 24V dc Analog Block I/O (voltage outputs) 1791-NDC – 24V dc Analog Block I/O (current outputs)

Updated Information

Generally, change bars (as shown to the right of this paragraph) are used to show new or significantly revised copy. Certain additions, such as adding octal numbering or corrected typographical errors, are not shown by change bars.

S-1

Page 4

Table of Contents

Summary of Changes S1. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using This Manual P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Purpose Audience P1 Vocabulary P1 Manual Organization P1 Block I/O Products Covered by this Publication P2

of Manual

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . .

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

Introducing Block I/O 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter General Description 11 How Inputs 14 Scaling 16 Outputs 18

Objectives

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Block I/O Fits in a PLC System

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13. . . . . . . . . . . . . . . . . . . . . . .

Installing Block I/O 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Preinstallation Considerations 21 Installing Connecting Wiring 24 Termination Resistor 213 Remote Extended Compatibility of 1771 I/O Products with Extended Node Numbers 215 Selecting

Objectives

the Block I/O

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O Link

Node Capability

Remote I/O Link Speed

21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . .

23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

213. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

214. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. .

215. . . . . . . . . . . . . . . . . . . . . . . .

Configuring Your Block I/O for PLC Family

Programmable Controllers 31. . . . . . . . . . . . . . . . . . . . .

Chapter Setting Module Scan Time 37

Objectives

the Configuration Switches

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31. . . . . . . . . . . . . . . . . . . . . . . .

Analog Block Applications Using Block Transfers 41. . . . . . .

Chapter Reading Data and Status from the Module 41 Block Transfer Read Data Format 41 Configuring

Objectives

. . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . .

the Module and Setting Outputs with Block T

Instructions 43

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ransfer Write

41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page 5

Table of Contentsii

Analog Block Applications Using Discrete Transfers 51. . . . .

Chapter Discrete Data Transfer 51 Input Data Format 51 Output Data Format 52

Objectives

51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Programming Your Analog Block I/O Module 61. . . . . . . . . . .

Chapter Block Transfer Programming 61 PLC3 Program Example 62 PLC5 and PLC-5/250 Program Example 63 Sample Programs for Analog Block 64 PLC3 Family Processors 64 PLC5 Family Processors 65

Objectives

61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Calibration 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Tools and Equipment 71 Calibrating your Module 71

Objective

71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Module Indicators 81

Objectives

81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page 6

Using This Manual

Preface

Purpose

of Manual

Audience

Vocabulary

Manual Organization

This manual shows you how to use your block I/O with an Allen-Bradley programmable controller. It helps you:

install your module program your module troubleshoot your module

You must be able to program and operate an Allen-Bradley programmable controller (PLC) to make efficient use of block I/O modules.

We assume that you know how to do this in this manual. If you do not, refer to the appropriate PLC programming and operations manual before you attempt to program this module.

In this manual, we refer to:

the block I/O module as the “block” or the “module” the programmable controller as the “controller” or “processor”

This manual is divided into eight chapters. The following chart shows each chapter with its corresponding title and brief overview of the topics covered in that chapter.

Chapter Title Topics Covered

1 Introducing Block I/O

2 Installing Block I/O

3

4

5

6

7 Module Calibration How to calibrate analog block I/O

8 Troubleshooting

Appendix A Specifications Specifications for the block I/O modules

Configuring Your Block I/O for PLC Family Programmable Controllers

Analog Block Applications using Block Transfers

Analog Block Applications using Discrete Transfers

Programming Your Analog Block I/O Module

Description of the modules, including general and hardware features

Module power requirements, location, and wiring information

How to set the configuration switches and address the block I/O

How to use block transfer programming with your block I/O

How to use discrete transfer with your block I/O

Programming examples for analog block I/O and PLC family controllers

How to use the indicators to troubleshoot your block I/O module

P-1

Page 7

Preface

Using This Manual

Block

I/O Products Covered

by this Publication

Related Publications

This publication covers the following analog block I/O products:

Catalog Number Power Supply Voltage Inputs Outputs Description

1791N4V2 120V ac 4 2 analog - 4 input, 2 voltage output

1791N4C2 120V ac 4 2 analog - 4 input, 2 current output

1791NDV 24V dc 4 2 analog - 4 input, 2 voltage output

1791NDC 24V dc 4 2 analog - 4 input, 2 current output

For a list of publications with information on Allen-Bradley products, consult our publication index (SD499).

P-2

Page 8

Introducing Block I/O

y

Chapter

1

Chapter

Objectives

General Description

In this chapter, you will learn what analog block I/O is, its features, and how it functions.

Block I/O consists of small, self-contained remote I/O devices complete with power supply, programmable controller interface, input/output connections and signal conditioning circuitry. Table 1.A is a list of block I/O modules covered in this publication.

Table 1.A

of Block I/O

Types

Catalog Number Power Supply Voltage Inputs Outputs Description

1791N4V2 120V ac 4 2 analog - 4 input, 2 voltage output

1791N4C2 120V ac 4 2 analog - 4 input, 2 current output

1791NDV 24V dc 4 2 analog - 4 input, 2 voltage output

1791NDC 24V dc 4 2 analog - 4 input, 2 current output

The analog blocks are compatible with PLC-2, PLC-3, PLC-5/250 and



PLC-5 modular controllers. Refer to the table below for information on using block I/O with various Allen-Bradley programmable controllers.

family programmable controllers, and the SLC 5/02 (or greater)

If You are Using: You must use:

PLC2 family programmable controller

PLC3 family programmable controller

PLC5 family programmable controller

PLC5/250 programmable controller

SLC 500 programmable controller 1747SN remote I/O scanner

The analog blocks communicate via block transfer or discrete transfer with any Allen-Bradley programmable controller that connects to the remote I/O network. The analog blocks communicate with SLC family controllers using discrete transfer.

Each analog block has four independent inputs, which can be configured as either all voltage inputs or all current inputs. The block contains a 24V dc current limited voltage source for accommodating loop-powered current transducer inputs.

1771SN subI/O scanner or

1772SD and SD2 remote I/O scanners

Block attaches directly to controller

1-1

Page 9

Chapter 1

Introducing Block I/O

Analog block outputs are configured at the factory for either a current output or a voltage output. Outputs are not user-configurable.

Figure 1.1 shows the physical features of the block I/O.

Figure 1.1

Features of the Analog Block I/O Modules (1791N4V2 shown)

Major

1791N4V2

ANALOG

POWER

COMM

FAULT

BLOCK

Indicators

1

Removable

Terminal Strip for

Input, Output, Remote

I/O and Power

Connections

Switch Assemblies

Equipment Grounding

Stud

30

2 mounting holes for 1/4inch screws

12631I

Terminal Strip - Remote I/O link, power and input/output connections are made to the removable terminal strip for easy connection of wiring.

Switch Assembly - The modules contain two switch assemblies. Use these assemblies to make the following settings:

I/O rack number starting I/O group communication rate last I/O group last state transfer type processor restart/lockout

1-2

Status Indicators - Indicators display the status of module power, communication and fault. Use these indicators to help in troubleshooting.

Page 10

Chapter 1

Introducing Block I/O

How

Block I/O Fits in a

PLC System

Programmable Controller or Scanner

Block I/O is a complete I/O interface that includes the functionality of the I/O rack, adapter, power supply, and I/O module in a single unit. Connect sensors and actuators to the module and use the remote I/O cable to connect the block I/O to your programmable controller.

Connect the block I/O to your remote I/O link as you would any other device. Input and output data is scanned asynchronously and transferred back and forth between the block and the programmable controller using either block transfer or discrete transfer. When using block transfer (Figure 1.2), the block looks like a 1/4 I/O rack to the processor (two words of input image table memory and two words of output image table memory). Block transfer provides the most efficient use of your data table image memory, and allows access to all implemented user functions of the block.

Figure 1.2

I/O Connection in a PLC System using block transfer

Block

Block I/O  each block

1/4

is 1/4 I/O rack

1/4

1/4

+

Blocks are daisychained to a programmable controller or a scanner

1/4

+

+

= 1 I/O Rack

10828I

1-3

Page 11

Chapter 1

Introducing Block I/O

Discrete transfer (Figure 1.3) is intended to be used with controllers which do not have block transfer capability. However, discrete transfer can be used with any PLC family controller. When using discrete transfer, the block looks like a 1/2 I/O rack to the controller (four words of input image table memory and four words of output image table memory). Note that certain alarms and user scaling features are not available when using discrete transfer.

Figure 1.3

I/O Connection in an SLC System using discrete transfer

Block

Block I/O  each block

1747SN Remote I/O Scanner Module

1/2

is 1/2 I/O rack

1/2

Inputs

Simplified Schematic

Channel 0 Input

inV0

inI0

249Ω

RET in0

GND in0

20MΩ

20MΩ

Analog Input

1

Common

+

= 1 I/O Rack

Blocks are daisychained to a scanner

A simplified schematic of the input circuit of one input channel is shown below.

Analog Multiplexer

ATTENTION: The 249 ohm input current shunt is rated at

0.25 Watts. Do not exceed this power rating or apply more than 6V across the resistor

Channel 0

Channel 1

Channel 2

Channel 3

Instrumentation

Amplifier

+

-

Analog Input

1

Common

10828I

A/D

12501-I

1-4

Inputs have selectable input ranges as shown below.

Application Input Range Resolution

voltage +10V 14 Bits

voltage or current +5V 14 Bits

voltage 0 to 10V 14 Bits

voltage or current 0 to 5V 14 Bits

Page 12

Chapter 1

Introducing Block I/O

Voltage Input

Voltage inputs can be either single-ended or differential. In the voltage mode, a signal applied between inV0 and the combination of RET in0 shorted to GND in0 provides a single-ended input mode. A signal applied between inV0 and RET in0 provides a differential input mode. The four terminals for ground are internally connected together to form the analog input common. In either input mode (single-ended or differential) the common mode voltage between any input terminal and analog input common cannot exceed 11V or unreliable operation will occur. The figures below show examples of differential input mode and single-ended input mode.

10V

Differential Input Mode Singleended Input Mode

inV0

inI0

(no connection)

RET in0

GND in0

10V inV0

Current Input

When using the 0–5V or +5V range, an internal precision 249Ω shunt is provided on each input. Input current is measured when the I terminals are connected together. To get the proper input voltages, you must indicate that the current shunt is connected when you configure the module at powerup. A +24V power supply is provided for two-wire current transducers.

I

5V

Current Input

inV0

inI0

RETin0

inI0

(no connection)

RETin0

GNDin0

and V

IN

IN

GNDin0

Each range setting has a margin of 2.5% to allow for compensation of system or calibration inaccuracies.

1-5

Page 13

Chapter 1

Introducing Block I/O

This is illustrated using the +10V scale below:

14 Bits

Resolution

Margin

13.96 Bits

Margin

Input Signal

I1 I2 I3 I4 I5

Nominal Range

In the above scale, input signals 1 thru 5 produce corresponding internal analog to digital converter (ADC) binary counts. A full scale (FS) voltage input produces an internal count of 16383 (input signal 1), while a bottom scale (BS) voltage input produces an internal count of 0000 (input 5). During calibration, the module’s representation of the counts are adjusted so a voltage of nominal full scale (NFS) will produce a count shown as input signal 2 while the nominal bottom scale voltage (NBS) produces a count shown as input signal 4. For each range scale, the input voltage which produces the ADC count of input signals 1 thru 5 in the above scale are shown below:

Input Signal +/-10V 0-10V +/-5V 0-5V

I1 10.25V (FS) 10.25V (FS) 5.125V (FS) 5.125V (FS)

I2 +10.000V (NFS) 10.00V (NFS) 5.000V (NFS) 5.000V (NFS)

I3 0.000V 5.00V 0.000V 2.500V

I4 -10.000V (NBS) 0.00V (NBS) -5.000V (NBS) 0.000V (NBS)

I5 -10.25V (BS) -0.25V (BS) -5.125V (BS) -0.125V (BS)

Scaling

1-6

The input data represented at the module is always the internal ADC binary counts scaled by values set in the maximum (S

) and minimum (S

max

min

) scaler value using a two point scaling method. The input voltage which produces input signal 2 (V signal 4 (V

Scaling

Input Signal

Voltage

) is equal to S

nbs

Smax

I1 I2 I3 I4 I5

Vnfs

) is always equal to S

nfs

as shown below:

min

, and voltage of input

max

Smin

Vnbs

Page 14

Chapter 1

Introducing Block I/O

The following equation shows how the module interprets the input data:

Module where:

data = M x Vin + B

– S

(S

M =

B =

(V

(S

max

nfs

min

– V

x V

(V

min

nbs

nfs

nfs

)

) – (S

)

– V

nbs

max

)

x V

nbs

)

You can choose one of three scaling methods:

binary counts (module sets scalers) default scaling (module sets scalers) user scaling (you set scalers)

User scaling is not available when you select discrete transfer mode.

Binary Counts Scaling

Binary counts scaling mode activates when the module powers up. This mode guarantees the maximum resolution. The module sets the scalers as shown in the following table:

Scaler +/-10V 0-10V +/-5V 0-5V

S

max

S

min

8191 16383 8191 16383

-8192 0 -8192 0

Default Scaling

Default scaling mode scales inputs to the input stimulus in either millivolts or microamps. The module sets the scalers as shown in the following tables:

With Voltage Input Selected

Scaler +/-10V 0-10V +/-5V 0-5V

S

S

With Current Input Selected

Scaler +/-10V 0-10V +/-5V 0-5V

S

S

10,000mV 10,000mV 5000mV 5000mV

max

-10,000mV 0mV -5000mV 0mV

min

max

min

N/A N/A 20000uA 20000uA

N/A N/A -20000uA 0uA

1-7

Page 15

Chapter 1

Introducing Block I/O

User Scaling

User scaling is available only when using the block transfer mode. This mode allows you to define S

max

and S

in engineering units in the block

min

transfer write data table. The integer range is 32,767 to –32,768. Important: If the range of user scaling values is set less than the range of

binary counts scaling values, input resolution is sacrificed.

Scaling Example

Using the +10V range scale, the following illustration shows five possible input signals.

14 Bits

Resolution

Margin

13.96 Bits

Margin

Outputs

Input Signal

10.25 10 0 -10 -10.25

Nominal Range

The following table shows how the five signals will be scaled using each of the three scaling methods. In the user scaling column, the S to represent 5000 and the S

Input Value

Approx. +10.25V 8395 10250 5062

+10.000V 8191 10000 5000 (Smax)

0.000V 0000 00000 2500

-10.000V -8192 -10000 0000 (Smin)

Approx. -10.25V -8396 -10250 -0062

Binary Counts Default User

was set to represent 0.

min

Scaling Method

max

was set

The type of output your block I/O module has depends on its catalog number:

1791-N4V2 and 1791-NDV have two +10V voltage outputs 1791-N4C2 and 1791-NDC have two 0-20mA current outputs

1-8

For any of the above modules, if your program tries to write a value which is outside the output range, the output will be clamped at either the maximum or minimum value. This condition will be indicated in the block transfer read status word.

Page 16

V

OUTS

Digital Output

Opto

Isolation

Isolated Analog Output Common

Chapter 1

Introducing Block I/O

V

oltage Outputs - 1791N4V2 and 1791NDV

A simplified schematic of a +10V output channel is shown below.

Precision

Operational

Amplifier

DAC

2

+

-

2

V

OUT

V

RET

Note: Schematic does not show overvoltage protection circuits.

The +10V output provides 14 bits of resolution and is capable of driving loads as small as 1k ohm. The output sacrifices a small amount of the resolution to provide a margin of 2.5% to allow for system or calibration inaccuracies as shown below.

Resolution

Output Signal

Scaling

The digital data sent to the output is always scaled by the values set in the maximum (S scaling method. When digital data sent equals S +10.000V and the digital data sent equals S –10.000V. The following equations shows this relationship:

Isolated Analog

2

Output Common

14 Bits

13.96 Bits

Margin

10.25 10 0 -10 -10.25

Nominal Range

) and minimum (S

max

) scaler values using a two point

min

Isolated Analog

2

Output Common

, the output produces

max

, the output produces

min

12501-I

Margin

Vout

= M x Module Data + B

where:

M =

B =

(Smax – Smin)

10 x (Smax + Smin)

(Smax – Smin)

20V

1-9

Page 17

Chapter 1

Introducing Block I/O

You can choose one of three scaling methods:

binary counts default scaling user scaling

User scaling is not available when you select discrete transfer mode.

The following table shows the output signals produced by various module data values entered in each of the three scaling methods. In the user scaling column, S

Output Signal

Approx. +10.25V 8395 10250 5062

was set to 5000 and S

max

Binary Counts

Scaling

was set to 0000.

min

Module Data

Default Scaling

User

Scaling

+10V 8191 10000 5000 (Smax)

0.000V 0000 00000 2500

-10.00V -8192 -10000 0000 (Smin)

Approx. -10.25V -8396 -10250 -0062

Current Outputs - 1791N4C2 and 1791NDC

A simplified schematic of a 0 to 20mA output channel is shown below.

I

OUTS

Digital Output

Note: Schematic does not show overvoltage protection circuits.

Opto

Isolation

Isolated Analog Output Common

DAC

2

Isolated Analog Output Common

High Side

Current Monitor

2

+15V

-15V

I

OUT

I

RET

12505-I

1-10

The 0 to 20mA output provides 13 bits of resolution and is capable of driving loads as large as 1k ohm.

Page 18

Chapter 1

Introducing Block I/O

The output sacrifices a small amount of the resolution to provide a margin of 2.5% to allow for system or calibration inaccuracies as shown below.

13 Bits

Resolution

Margin

12.9 Bits

Margin

Input Signal

20.5 20 10 0.0 –0.5

Nominal Range

Scaling

The digital data sent to the output is always scaled by the values set in the maximum (S scaling method. When digital data sent equals S

20.000mA and the digital data sent equals S

0.000mA. The following equations shows this relationship:

Iout where:

You can choose one of three scaling methods:

binary counts default scaling user scaling

) and minimum (S

max

= M x Module Data + B

M =

B =

(Smax – Smin)

20mA x (Smax + Smin)

(Smax – Smin)

min

20mA

) scaler values using a two point

, the output produces

max

, the output produces

min

User scaling is not available when you select discrete transfer mode.

The following table shows the output signals produced by various module data values entered in each of the three scaling methods. In the user scaling column, S

Output Signal

Nominally +20.5mA 8395 10250 5062

20.000mA 8191 10000 5000 (Smax)

0.000mA 0000 00000 2500 (Smin)

Nominally -0.5mA

1

The actual output can never go negative. However

compensation.

was set to 5000 and S

max

Binary Counts Scaling Default Scaling User Scaling

1

-0396 -00050 -2437

was set to 0000.

min

Module Data

, some of the output range is used to allow for zero of

fset

1-11

Page 19

Installing Block I/O

1771SN

14 blocks with 150 ohm terminator PLC2 famil

1772SD, 1772SD2

16 blocks/channel, 28 blocks/scanner

A

PLC3

with 150 ohm terminator. 128 blocks 32 blocks/channel, 64 blocks/scanner

with 2 scanners, 82 ohm terminator PLC

Chapter

2

Chapter

Objectives

Preinstallation Considerations

When using and Maximum Capacity



y

In this chapter, you will learn how to mount the block, connect the remote I/O link, connect the input and output wiring to the block, and terminate the remote I/O link.

Before installation, you must determine the:

scanner/processor to use number of blocks on your network throughput requirements total distance of the installation transmission rate desired external fuses required (if any)

Acceptable combinations are shown in Table 2.A.

Table 2.A Acceptable







Combinations of Processor and Block I/O

Baud Rate

14 blocks with 150 ohm terminator and discrete transfer

16 blocks/channel, 28 blocks/scanner with 150 ohm terminator

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

Used

Maximum

Network Distance

PLC3 family



5 family



ny

1775S5, or SR5 module

PLC5VME (6008LTV)

PLC5/11

scanner module

16 blocks/channel, 64 blocks/scanner with 150 ohm terminator. 128 blocks with 2 scanners and 150 ohm terminator.

32 blocks/channel, 64 blocks/scanner with 82 ohm terminator. 128 blocks with 2 scanners, 82 ohm terminator and extended node addressing.

4 blocks with 150 ohm terminator

4 blocks with 150 ohm terminator

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

230.4K 2,000 cablefeet

57.6K 10,000 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

230.4K 2,500 cablefeet

2-1

Page 20

Chapter 2

terminator

16 blocks/channel, 28 blocks per 28 blocks/ch

16 blocks/channel, 60 blocks per 32 blocks/ch

16 blocks/channel, 32 blocks per 32 blocks/ch

16 blocks/channel, 64 blocks per 32 blocks/ch

16 blocks/channel, 32 blocks per 32 blocks/ch

Installing Block I/O

PLC5 family (continued)

PLC5/15

PLC5/20

PLC5/25

PLC5/30

PLC5/40

Maximum CapacityandWhen using

1

12 blocks with 150 ohm terminator 57.6K 10,000 cablefeet

Baud Rate

Used

Maximum

Network Distance

57.6K 10,000 cablefeet

12 blocks with 82 ohm or 150 ohm terminator

115.2K 5,000 cablefeet

230.4K 2,500 cablefeet

2

16 blocks with 150 ohm terminator, 28 blocks with 82 ohm terminator and

57.6K 10,000 cablefeet

extended node addressing

16 blocks/channel, 28 blocks per processor with 150 ohm terminator

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

annel, 28 blocks per

processor with 82 ohm terminator

115.2K 5,000 cablefeet

and extended node addressing

230.4K 2,500 cablefeet

16 blocks/channel, 60 blocks per processor with 150 ohm terminator

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

annel, 60 blocks per

processor with 82 ohm terminator

115.2K 5,000 cablefeet

and extended node addressing

230.4K 2,500 cablefeet

PLC5/40L

PLC5/60

PLC5/60L

16 blocks/channel, 32 blocks per processor with 150 ohm terminator

annel, 60 blocks per processor with 82 ohm terminator and extended node addressing

16 blocks/channel, 64 blocks per processor with 150 ohm terminator

annel, 92 blocks per processor with 82 ohm terminator and extended node addressing

16 blocks/channel, 32 blocks per processor with 150 ohm terminator

annel, 64 blocks per processor with 82 ohm terminator and extended node addressing

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

230.4K 2,500 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

230.4K 2,500 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

230.4K 2,500 cablefeet

2-2

Page 21

Chapter 2

a 5 50 S e o e sca e

32 blocks/channel, 32

scanners) with 82 ohm terminator 8 block

3

Controller

Module (discrete mode only)

Installing Block I/O

Maximum CapacityandWhen using

16 blocks/channel, 32

Baud Rate

Used

57.6K 10,000 cablefeet

blocks/scanner, (128 blocks with 4 scanners) with 150 ohm terminator

PLC5 family (continued)

PLC5/250  requires a 5150RS remote scanner

32 blocks/channel, 32 blocks/scanner, (128 blocks with 4 scanners) with 82 ohm terminator and extended node addressing

SLC5/02 (and greater) Controller

1747SN Remote I/O Scanner Module (discrete mode only)

s with 150 ohm terminator

8 blocks with 82 ohm terminator

1

PLC5/15 series A and PLC5/15 series B prior to revision H (B/H) can only address 3 blocks.

2

PLC5/25 revisions prior to A/D can only address 7 blocks.

3

Analog block is 1/2 rack in discrete transfer mode. If you combine analog block and discrete transfer on the same RIO link, the capacity ranges between 8 and 15 blocks.

Installing the Block I/O

Figure 2.1 shows the mounting dimensions for the block I/O module.

115.2K 5,000 cablefeet

57.6K 10,000 cablefeet

115.2K 5,000 cablefeet

230.4K 2,500 cablefeet

57.6K 10,000 cablefeet

3

115.2K 5,000 cablefeet

3

230.4K 2,500 cablefeet

Mount the blocks vertically with a minimum of 2” between blocks. This air gap is necessary to maintain proper cooling air flow through the block.

Maximum

Network Distance

Block

2.0 (50.8) air gap on all 4 sides.

Operating temperature in

gap

below module must

air not

exceed 60oC (140oF).

Figure 2.1 Mounting

Equipment Grounding Stud

CAUTION:

Dimensions for the Block I/O Modules (1791N4V2 shown)

2.710

1

(68.8)

1.71

(43.4)

ANALOG BLOCK

0

1

POWER

COMM

FAULT

1791N4V2

OUTPUT

INPUT

Inches

(Millimeters)

6.95H x 2.710W x 3.85D (176.5H x 68.8W x 98D)

0

1

2

3

2 mounting holes for 1/4inch screws

0.5

(12.7)

6.95

6.60

(176.5)

(167.6)

30

When tightening grounding stud nut, do not exceed 15 inlbs.

2-3

Page 22

Chapter 2

Installing Block I/O

Connecting Wiring

Figure 2.2 Mounting

1. Hook top of slot over DIN rail.

2. While pressing block against rail, pull down on locking lever.

3. When block is flush against rail, push up on locking lever to secure block to rail.

on a DIN Rail

Block

DIN Rail

AB pt. no. 199DR1

DIN 462773

EN 50022

(3.4 x 7.5mm)

Locking Lever

12382I

Make wiring connections to the removable terminal block which plugs into the front of the block.

Figure 2.3 Removing

ATTENTION: The terminal block is not keyed to prevent incorrect insertion. If you remove the terminal block, make certain that it is inserted with the lower row of screws on the outside of the block with number 1 at the top of the terminal strip.

the T

erminal Block

To remove the terminal strip, unscrew the two captive screws and pull the terminal strip out.

2-4

12383I

Page 23

Chapter 2

Installing Block I/O

Figure 2.4 Terminal

Block Pin Numbering

Refer to the following table for wiring schematics and connecting wiring lists for the analog block modules.

Power Supply Voltage Input For Schematic refer to: For wiring refer to:

120V ac

24V dc

120V ac

24V dc

120V ac

24V dc

Wiring Connections for the Analog Block with

Wiring Connections for the Analog Block with Voltage Inputs

Wiring Connections for the Analog Block with

Wiring Connections for the Analog Block with Current Input and CustomerSupplied Loop Power

Wiring Connections for the Analog Block with

Wiring Connections for the Analog Block with Current Input and BlockSupplied Loop Power

Figure 2.5, page 26 Table 2.B, page 29

Figure 2.6, page 26 Table 2.C, page 210

Figure 2.7, page 27 Table 2.D, page 211

Figure 2.8, page 27 Table 2.E, page 212

Figure 2.9, page 28 Table 2.D, page 211

Figure 2.10, page 28 Table 2.E, page 212

2-5

Page 24

Chapter 2

Installing Block I/O

RIO

Figure 2.5

Connections for the 120V ac Analog Block with V

Wiring

GND

NOT

USED

BLU

CLR

RET in0

GND in0

RET in1

GND in1

RET in2

GND in2

RET in3

GND in3

RET out0

RET out1

NOT

USED

30

NOT

USED

SHD

in

in I0

in V1

in I1

in V2

in I2

in V3

in I3

+24 Vdc

out0

out1

1

L1

N

V0

L1

Voltage Input

+

User Analog Input Device

-

User +24V User GND

Output

+

User Analog

Output Device

-

oltage Inputs

L2/N

Analog signals must be within the 10V common mode voltage range which is referenced to the analog input common (GND). Typically, this is accomplished by connecting to user ground. If an input channel floats outside of this range, invalid input readings will result.

RIO

Figure 2.6

Connections for the 24V dc Analog Block with V

Wiring

GND

NOT

USED

BLU

CLR

RET in0

GND in0

RET in1

GND in1

RET in2

GND in2

RET in3

GND in3

RET out0

RET out1

NOT

USED

30

RET +24

NOT

USED

SHD

in

in I0

in V1

in I1

in V2

in I2

in V3

in I3

+24 Vdc

out0

out1

1

+24

V0

+

+24V dc

Supply

Voltage Input

+

User Analog Input Device

-

User +24V User GND

Output

+

User Analog

Output Device

-

oltage Input

-

Analog signals must be within the 10V common mode voltage range which is referenced to the analog input common (GND). Typically, this is accomplished by connecting to user ground. If an input channel floats outside of this range, invalid input readings will result.

2-6

Page 25

RIO

Output

User Analog

Output Device

Figure 2.7

Connections for the 120V ac Analog Block with Current Input and

Wiring CustomerSupplied Loop Power

GND

NOT

USED

BLU

CLR

RET in0

GND in0

RET in1

GND in1

RET in2

GND in2

RET in3

GND in3

-

+

RET out0

RET out1

NOT

USED

30

NOT

USED

SHD

in

in I0

in V1

in I1

in V2

in I2

in V3

in I3

+24 Vdc

out0

out1

Chapter 2

Installing Block I/O

1

L1

N

L1

+

V0

-

User +24V User GND

ATTENTION: The 249 ohm input current shunt is rated at 0.25 Watts. Do not exceed this rating.

L2/N

Current Input

User Analog Input Device

Analog signals must be within the 10V common mode voltage range which is referenced to the analog input common (GND). Typically, this is accomplished by connecting to user ground. If an input channel floats outside of this range, invalid input readings will result.

RIO

Output

User Analog

Output Device

Figure 2.8

Connections for the 24V dc Analog Block with Current Input and

Wiring CustomerSupplied Loop Power

GND

NOT

USED

BLU

CLR

RET in0

GND in0

RET in1

GND in1

RET in2

GND in2

RET in3

GND in3

-

+

RET out0

RET out1

NOT

USED

30

RET +24

NOT

USED

SHD

in

in I0

in V1

in I1

in V2

in I2

in V3

in I3

+24 Vdc

out0

out1

1

+24

V0

+

+24V dc

Supply

Current Input

+

User Analog Input Device

-

User +24V User GND

ATTENTION: The 249 ohm input current shunt is rated at 0.25 Watts. Do not exceed this rating.

-

Analog signals must be within the 10V common mode voltage range which is referenced to the analog input common (GND). Typically, this is accomplished by connecting to user ground. If an input channel floats outside of this range, invalid input readings will result.

2-7

Page 26

Chapter 2

Installing Block I/O

Figure 2.9

Connections for the 120V ac Analog Block with Current Input and

Wiring BlockSupplied Loop Power

RIO

Output

User Analog

Output Device

RIO

Output

User Analog

Output Device

1

L1

GND

N

NOT

USED

NOT

USED

BLU

SHD

CLR

in

V0

RET in0

in I0

GND in0

in V1

RET in1

in I1

GND in1

in V2

RET in2

in I2

GND in2

in V3

RET in3

in I3

GND in3

+24

RET

-

+

out0

RET out1

NOT

USED

30

Vdc

out0

out1

L1

i

i

+24V dc loop power supplied at terminal 25 on block

ATTENTION: The 249 ohm input current shunt is rated at 0.25 Watts. Do not exceed this rating.

L2/N

Loop Powered

Current Input

User Analog

Input Device

Analog signals must be within the 10V common mode voltage range which is referenced to the analog input common (GND). Typically, this is accomplished by connecting to user ground. If an input channel floats outside of this range, invalid input readings will result.

Figure 2.10

Connections for the 24V dc Analog Block Module with Current

Wiring Input and BlockSupplied Loop Power

1

+24

GND

RET +24

NOT

USED

NOT

USED

BLU

SHD

CLR

in

V0

RET in0

in I0

GND in0

in V1

RET in1

in I1

GND in1

in V2

RET in2

in I2

GND in2

in V3

RET in3

in I3

GND in3

+24

RET

-

+

out0

RET out1

NOT

USED

30

Vdc

out0

out1

+

+24V dc

-

Supply

Loop Powered

Current Input

i

User Analog

i

Input Device

+24V dc loop power supplied at terminal 25 on block

ATTENTION: The 249 ohm input current shunt is rated at 0.25 Watts. Do not exceed this rating.

Analog signals must be within the 10V common mode voltage range which is referenced to the analog input common (GND). Typically, this is accomplished by connecting to user ground. If an input channel floats outside of this range, invalid input readings will result.

2-8

Page 27

Table 2.B

Power

Remote I/O

Block Designations for Cat. No. 1791N4V2

Wiring

Connections

Designation Description Terminal No.

Chapter 2

Installing Block I/O

1791-N4V2

Power

Connections

L1 ac hot 1

N

ac neutral 3

GND Chassis ground 2

Transducer

2

Power

Remote I/O

Connections

+24V For current input only 25

BLU Blue wire - RIO 6

CLR

Clear wire - RIO 8

SHD Shield - RIO 7

I/O Connections

inV0 thru inV3 Voltage Input 0 through 3 9, 13, 17, 21

Voltage Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

inI0 thru inI3 Current Input 0 through 3 11, 15, 19, 23

Current Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

Input Ground GNDin0GNDin3 Channels 03 ground 12, 16, 20, 24

out 0 - RET out 0

Output

out 1 - RET out 1

Not used

1

Connect

chassis ground to equipment grounding stud. These are not internally connected.

2

2028V dc (nominal 24V, 100mA)) voltage source for accommodating looppowered current transducer inputs.

3

Terminals

4

12, 16, 20, and 24 are internally connected.

T

erminals 26 and 28 internally connected together

.

Output 0 (+)

Return output 0 (-)

Output 1 (+)

Return output 1 (-)

For internal test only; not

for customer use.

4, 5, 30

26

28

27

29

1

3

4

4

2-9

Page 28

Chapter 2

Power

Remote I/O

Installing Block I/O

Table 2.C

Block Designations for Cat. No. 1791NDV

Wiring

Connections

Power

Connections

Transducer

2

Power

Remote I/O

Connections

Designation Description Terminal No.

+24 +24V dc Power 1

RET +24

GND Chassis ground 2

dc Return 3

1

+24V For current input only 25

BLU Blue wire - RIO 6

CLR

Clear wire - RIO 8

SHD Shield - RIO 7

I/O Connections

inV0 thru inV3 Voltage Input 0 through 3 9, 13, 17, 21

1791-NDV

Voltage Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

inI0 thru inI3 Current Input 0 through 3 11, 15, 19, 23

Current Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

Input Ground GNDin0-GNDin3 Channels 0-3 ground 12, 16, 20, 24

out 0 - RET out 0

Output

out 1 - RET out 1

Not used

1

Connect

chassis ground to equipment grounding stud. These are not internally connected.

2

2028V dc (nominal 24V, 100mA) voltage source for accommodating looppowered current transducer inputs.

3

T

erminals 12, 16, 20, and 24 are internally connected.

4

T

erminals 26 and 28 internally connected together

Output 0 (+)

Return output 0 (-)

Output 1 (+)

Return output 1 (-)

For internal test only; not

for customer use.

.

27

4

26

29

4

28

4, 5, 30

3

2-10

Page 29

Table 2.D

Power

Remote I/O

Block Designations for Cat. No. 1791N4C2

Wiring

Connections

Designation Description Terminal No.

Chapter 2

Installing Block I/O

1791-N4C2

Power

Connections

Transducer

2

Power

Remote I/O

Connections

L1 ac hot 1

N

ac neutral 3

GND Chassis ground 2

+24V For current input only 25

BLU Blue wire - RIO 6

CLR

Clear wire - RIO 8

1

SHD Shield - RIO 7

I/O Connections

inV0 thru inV3 Voltage Input 0 through 3 9, 13, 17, 21

Voltage Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

inI0 thru inI3 Current Input 0 through 3 11, 15, 19, 23

Current Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

Input Ground GNDin0GNDin3 Channels 03 ground 12, 16, 20, 24

out 0 - RET out 0

Output

out 1 - RET out 1

Not used

1

Connect

chassis ground to equipment grounding stud. These are not internally connected.

2

2028V dc (nominal 24V, 100mA) voltage source for accommodating looppowered current transducer inputs.

3

T

erminals 12, 16, 20, and 24 are internally connected.

4

T

erminals 26 and 28 internally connected together

.

Output 0 (+)

Return output 0 (-)

Output 1 (+)

Return output 1 (-)

For internal test only; not

for customer use.

27

4

26

29

4

28

4, 5, 30

3

2-11

Page 30

Chapter 2

Remote I/O

Installing Block I/O

Table 2.E

Block Designationsfor Cat. No. 1791NDC

Wiring

Connections

Designation Description Terminal No.

+24 +24V dc Power 1

1791-NDC

Power Connections

RET +24

dc Return 3

GND Chassis ground 2

Transducer Power

Remote I/O

Connections

2

+24V For current input only 25

BLU Blue wire - RIO 6

CLR

Clear wire - RIO 8

SHD Shield - RIO 7

I/O Connections

inV0 thru inV3 Voltage Input 0 through 3 9, 13, 17, 21

Voltage Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

inI0 thru inI3 Current Input 0 through 3 11, 15, 19, 23

Current Input

RET in0 thru

RET in3

Input Return 0 through 3 10, 14, 18, 22

Input Ground GNDin0-GNDin3 Channels 0-3 ground 12, 16, 20, 24

out 0 - RET out

0

Output

out 1 - RET out

1

Not used

1

Connect

chassis ground to equipment grounding stud. These are not internally connected.

2

2028V dc (nominal 24V, 100mA) voltage source for accommodating looppowered current transducer inputs.

3

T

erminals 12, 16, 20, and 24 are internally connected.

4

T

erminals 26 and 28 internally connected together

.

Output 0 (+)

Return output 0 (-)

Output 1 (+)

Return output 1 (-)

For internal test only; not

for customer use.

1

27

4

26

29

4

28

4, 5, 30

3

2-12

Table 2.F

W

Acceptable

Remote I/O link Belden 9463

Input and output wiring Up to 14AWG (2mm2) stranded with 3/64 inch insulation

iring Cables for Block I/O Connection

Use Cable Type

Page 31

Chapter 2

Installing Block I/O

Termination Resistor

Remote I/O Link

A termination resistor must be installed on the last block in a series. Connect the resistor as shown in Figure 2.11.

Figure 2.11 Installing

Connect termination resistor across terminals 6 (BLU) and 8 (CLR).

Refer to Table 2.A for proper terminator for your application.

the T

ermination Resistor

Termination

Resistor

BLU

CLR

SHD

10835I

Blocks must be wired in series as shown in Figure 2.12 or Figure 2.13. Do not attempt to wire any block in parallel.

The number of blocks used depends not only on the user requirements but also on the system used. Refer to Table 2.A (page 2-1) for maximum block usage for individual systems.

Figure 2.12

Connection for Block I/O Using PLC2, PLC3 or PLC5 Family

Series Programmable Controllers

To Programmable

Controller or I/O

Scanner Module

Install terminating resistor on last block.

1 I/O Rack

1 I/O Rack

1 I/O Rack

1 I/O Rack

10833I

2-13

Page 32

Chapter 2

Installing Block I/O

To 1747SN

Scanner Module

Figure 2.13

Configurations for Block I/O Using the SLC Programmable

Series Controller

1

2

7

8

Up to 8 blocks with SLC5/02

Extended Node Capability

Install terminating resistor on last block.

10834I

If this is the last remote I/O adapter on the remote I/O link in a PLC system, you must use a terminating resistor to terminate both ends of the remote I/O link (scanner end and last block end). The size of the terminator is determined by the system configuration.

Older system configurations must use a 150 ohm resistor at both ends. With newer devices that can support it, you can use an 82 ohm termination resistor at both ends. The 82 ohm terminators provide “extended node” capability which allows you to have up to 32 physical devices on the remote I/O link. (The number of logical racks capable of being addressed by the scanner is not affected.)

ATTENTION: Devices that are operating at 230.4K baud must have 82 ohm terminators in place for proper operation.

2-14

Page 33

Chapter 2

Installing Block I/O

Compatibility

of 1771 I/O Products with Extended Node Numbers

Certain products are not compatible with extended node capabilities obtained with the use of 82 ohm terminators. Table 2.G lists those products that are not compatible.

Table 2.G Noncompatible

Scanners

Adapters  1771AS All

Miscellaneous  1771AF All

Products

Device Series



1771SN All

1772SD All

1772SD2 All

1775SR All

1775S4A All

1775S4B All

1771ASB Series A

1771DCM All

1771AF1 All

Selecting Remote I/O Link Speed

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

Block throughput using analog block is dependent on the controllers data transfer rate. Analog block outputs are updated within 10ms of receiving output data from the controller. The analog block inputs are sampled in a “round robin” fashion with an input channel sampled every 27ms. This means that a given input channel is sampled every 108ms (four input channels times 27ms). At the end of every sample period of 27ms, the most recent input data is made available for data transfer to the controller.

Consult your programmable controller user manual for Remote I/O Communications to determine your system throughput.

2-15

Page 34

Chapter

3

Configuring Your Block I/O for PLC Family Programmable Controllers

Chapter

Setting the Configuration Switches

Objectives

In this chapter, you will learn how to configure your block I/O when used with PLC family programmable controllers. This includes the following:

setting the configuration switches addressing the block I/O

Each block I/O module has two 8-position switches for setting:

starting I/O group I/O rack number communication rate last chassis last state block transfer/discrete transfer processor restart/lockout

These switches are accessible by opening the clear plastic door on the front of the module (Figure 3.1).

ATTENTION: Recycle power to the block I/O module after setting the switches.

3-1

Page 35

Chapter 3

Configuring Your Block I/O for PLC Family Programmable Controllers

1

Figure 3.1

Settings for the Analog Block I/O Modules

Switch

1791N4V2

ANALOG

BLOCK

SW2-8

Not used

87654321

SW2-7

Not Used

30

Open clear front cover to access switches

POWER

COMM

FAULT

SW2

01

SW1

01

Position = 1Position = 0

End View of Switch

87654321

SW2-6 Last I/O Group

0 Not last rack

1 Last rack

SW2-5

Processor

Restart/Lockout (PRL)

0 Processor Restart

1 Processor Lockout

SW2-4 Hold Last State

0 Reset Outputs

1 Hold Last State

SW2-3 Transfer Type

0 Block Transfer

1 Discrete Transfer

Communication Rate

SW2-2 SW2-1 Bits/s

3-2

ATTENTION: Recycle power to the block I/O module

after setting the switches.

0 0 57.6 K

0 1 115.2 K

1 0 230.4 K

1 1 230.4 K

Starting Quarter

SW1-2 SW1-1

0 0 0 (1st)

0 1 2 (2nd)

1 0 4 (3rd)

1 1 6 (4th)

Module

Group

Page 36

Chapter 3

Configuring Your Block I/O for PLC Family Programmable Controllers

1747SN

Rack

Number

Rack

Rack 1 Rack 2 Rack 2 Rack 1 Rack 1 Rack 1

Rack 2 Rack 3 Rack 3 Rack 2 Rack 2 Rack 2

Rack 3 Rack 4 Rack 4 Rack 3 Rack 3 Rack 3

1771SN

Rack

Number

0

Rack 1 Rack 1

Rack 5 Rack 5 Rack 4 Rack 4 Rack 4

Rack 6 Rack 6 Rack 5 Rack 5 Rack 5

Rack 7 Rack 7 Rack 6 Rack 6 Rack 6

PLC2

Rack

Number

PLC5

Rack

Number

Not V

Rack 7 Rack 7 Rack 7

Rack 10 Rack 10 Rack 10

Rack 1

Rack 12 Rack 12 Rack 12

Rack 13 Rack 13 Rack 13

Rack 14 Rack 14 Rack 14

Rack 15 Rack 15 Rack 15

Rack 16 Rack 16 Rack 16

Rack 17 Rack 17 Rack 17

Rack 20 Rack 20 Rack 20 Rack 21 Rack 21 Rack 21 Rack 22 Rack 22 Rack 22 Rack 23 Rack 23 Rack 23 Rack 24 Rack 24 Rack 24 Rack 25 Rack 25 Rack 25 Rack 26 Rack 26 Rack 26 Rack 27 Rack 27 Rack 27

PLC5/250

Number

alid

1

Rack 1

Rack 30 Rack 30 Rack 31 Rack 31 Rack 32 Rack 32 Rack 33 Rack 33 Rack 34 Rack 34 Rack 35 Rack 35 Rack 36 Rack 36 Rack 37 Rack 37

Rack

Rack 0 Rack 0

PLC3

Rack

Number

1

Rack 1

Rack 40 Rack 41 Rack 42 Rack 43 Rack 44 Rack 45 Rack 46 Rack 47 Rack 50

SW1 Switch Position

8 7 6 5 4 3

0 0 0 0 0 0

0 0 0 0 0 1

0 0 0 0 1 0

0 0 0 0 1 1

0 0 0 1 0 0

0 0 0 1 0 1

0 0 0 1 1 0

0 0 0 1 1 1

0 0 1 0 0 0

1 0 0 1 0 0 1

0 0 1 0 1 0

0 0 1 0 1 1

0 0 1 1 0 0

0 0 1 1 0 1

0 0 1 1 1 0

0 0 1 1 1 1

0 1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 1 0 0 1 0 0 1 1 0 1 0 1 0 0 0 1 0 1 0 1 0 1 0 1 1 0 0 1 0 1 1 1 0 1 1 0 0 0 0 1 1 0 0 1 0 1 1 0 1 0 0 1 1 0 1 1 0 1 1 1 0 0 0 1 1 1 0 1 0 1 1 1 1 0 0 1 1 1 1 1 1 0 0 0 0 0 1 0 0 0 0 1 1 0 0 0 1 0 1 0 0 0 1 1 1 0 0 1 0 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 1 1 0 1 0 0 0

3-3

Page 37

Chapter 3

Configuring Your Block I/O for PLC Family Programmable Controllers

1747SN

1747SN

Rack

Rack

Number

Number

Rack

address 77 is an illegal configuration. PLC5/1 PLC5/15 and PLC5/20 processors can scan racks 0103. PLC5/25 and PLC5/30 processors can scan racks 0107. PLC5/40 and PLC5/40L processors can scan racks 0117. PLC5/60 and PLC5/60L processors can scan racks 0127. PLC5/250 processors can scan racks 037. PLC3 processors can scan racks 076.

1771SN

1771SN

Rack

Rack

Number

Number

1 processors can scan rack 03.

PLC2

PLC2

Rack

Rack

Number

Number

PLC5

PLC5

Rack

Rack

Number

Number

PLC5/250

PLC5/250

Rack

Rack

Number

Number

PLC3

PLC3

Rack

Rack

Number

Number

Rack

51 Rack 52 Rack 53 Rack 54 Rack 55 Rack 56 Rack 57 Rack 60 Rack 61 Rack 62 Rack 63 Rack 64 Rack 65 Rack 66 Rack 67 Rack 70 Rack 71 Rack 72 Rack 73 Rack 74 Rack 75 Rack 76

Not V

alid 1 1 1 1 1 1

SW1 Switch Position

1 0 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 1 1 0 1 1 0 0 1 0 1 1 0 1 1 0 1 1 1 0 1 0 1 1 1 1 1 1 0 0 0 0 1 1 0 0 0 1 1 1 0 0 1 0 1 1 0 0 1 1 1 1 0 1 0 0 1 1 0 1 0 1 1 1 0 1 1 0 1 1 0 1 1 1 1 1 1 0 0 0 1 1 1 0 0 1 1 1 1 0 1 0 1 1 1 0 1 1 1 1 1 1 0 0 1 1 1 1 0 1 1 1 1 1 1 0

345678

3-4

The SLC 500 controllers communicate with the block I/O using an I/O Scanner module (cat. no. 1747-SN series A). Refer to the user manual for the 1747-SN/A Scanner module for more information.

Note: These block I/O modules are not compatible with the 1747-DSN Distributed I/O Scanner module.

Page 38

Block transfer requires 1/4 rack.

Chapter 3

Configuring Your Block I/O for PLC Family Programmable Controllers

When using block transfer, each analog block I/O module uses 2 words of output image table memory and 2 words of input image table memory. Each block occupies 1/4 rack of data table, with 4 blocks comprising 1 logical rack. Image table usage for one assigned rack number is shown in Figure 3.3.

Figure 3.2

Image T

I/O

1791N4C2

MSB = Module Status Byte MCB = Module Control Byte

able for One Assigned Rack Number using Block T

Input Image

0 1 2 3 4 5 6 7

1791N4C2

0 1 2 3 4 5 6 7

MSB

Reserved

MSB

Reserved

Output Image

710

MCB

Reserved

MCB

Reserved

ransfer

PLC

017 710

1/4 Rack

1/4 Rack

PLC

017

1/4 Rack

1/4 Rack

3-5

Page 39

Chapter 3

Configuring Your Block I/O for PLC Family Programmable Controllers

Discrete transfer requires 1/2 rack.

1791N4C2

When using discrete transfer, each analog block I/O module uses 4 words of output image table memory and 4 words of input image table memory. Each block occupies 1/2 rack of data table, with 2 blocks comprising 1 logical rack. Image table usage for one assigned rack number is shown in Figure 3.3.

Figure 3.3

Image Table for One Assigned Rack Number using Discrete T

I/O

Input Image

0 1 2 3 4 5 6 7

1791N4C2

0 1 2 3 4 5 6 7

Input 0 Input 1 Input 2 Input 3 Input 0 Input 1 Input 2 Input 3

Output Image

710

Configuration

Output 0 Output 1

Reserved

Configuration

Output 0 Output 1 Reserved

ransfer

017 710

1/2 Rack

017

SLC 50007815 PLC

1/2 Rack

SLC 50007815 PLC

1/2 Rack

1/2 Rack

3-6

Page 40

Chapter 3

Configuring Your Block I/O for PLC Family Programmable Controllers

Module

Scan T

ime

Scan time depends on the block transfer rate over the remote I/O network, which is asynchronous to the module input sample rate and output update rate. The block transfer rate is dependent on the controller, program length, the amount of communication traffic to other modules on the remote I/O network and the speed (baud rate) of the remote I/O network.

Figure 3.4

Scan Time Relationships

Module

Block Transfer

Read

Input Sample

Rate

Block Transfer

Write

Output Update

1

Time depends on the remote I/O network configuration.

BTR1

108ms

Ch 0 Ch 1 Ch 2 Ch 3 Ch 0 Ch 1 Ch 2 Ch 3 Ch 0 Ch 1

BTW1

10ms 10ms

Ch 0 & Ch 1

updated

100ms to 2s

100ms to 2s

1

BTR2

1

BTW2

Ch 0 & Ch 1

updated

3-7

Page 41

Chapter

4

Analog Block Applications Using Block Transfers

Chapter

Objectives

Reading Data and Status from the Module

Block Transfer Read Data Format

In this chapter, you will read about:

reading data and status from the module block transfer read data format configuring the module and setting outputs with block transfer

write instructions

Block transfer instructions are used when the analog block is used with PLC programmable controllers with block transfer capability. Block transfer read (BTR) programming moves status and data from the module to the processor’s data table in one I/O scan. The processor user program initiates the request to transfer data from the module to the processor.

The transferred words contain module status, channel status and input data from the module. The maximum BTR data file length required is five words (0 thru 4).

The block transfer read data format consists of input data and module status. Word 0 contains the power up bit (PU), the bad configuration bit (BC), out of range bit (OR), status code, high alarm and low alarm bits. Words 1 through 4 contain input channel data.

Complete configuration data and bit/word descriptions are shown in Figure 4.1 and Table 4.A.

Figure 4.1

T

ransfer Read for Analog Blocks using PLC Controllers

Block

Decimal 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

0 PU BC OR Status Code High Alarm Low Alarm

1 Input Channel 0 Data

2 Input Channel 1 Data

3 Input Channel 2 Data

4 Input Channel 3 Data

4-1

Page 42

Chapter 4

Analog Block Applications Using Block Transfers

Word

Word 0

Table 4.A Bit/Word

Decimal

(Octal Bit)

Bits 15 (17)

Bit 14 (16)

Bit 13 (15)

Bits 0812

(1014)

Descriptions for Block Transfer Read Instruction

Bit

Power up (PU) status bit. This bit is set (1) if the module has not been configured since the last power up. It is reset (0) when at least one valid BTW has occurred since power up. Outputs are not enabled until the PU bit is reset.

Bad configuration (BC) bit. This bit is set (1) if an invalid configuration data has been received, and the previous configuration remains in effect.

Out of range (OR) bit. When set, indicates one or both of the outputs has received a value which exceeds the output range. Outputs are clamped at their maximum or minimum values depending on the direction of the out of range value.

Status Codes. When the Bad Configuration (BC) bit 14 (16), is set (1), the status code indicates the following: 1  output channel 0 scaling error 2  output channel 1 scaling error 3  input channel 0 scaling error 4  input channel 1 scaling error 5  input channel 2 scaling error 6  input channel 3 scaling error 7  channel 0 alarm error 8  channel 1 alarm error 9  channel 2 alarm error A  channel 3 alarm error When the output out of range (OR) bit 13 (15) is set (1), the status code bits indicate the following: Bit 08 (10)  output 0 has been clamped at its minimum Bit 09 (11)  output 1 has been clamped at its minimum Bit 10 (12)  output 0 has been clamped at its maximum Bit 11 (13)  output 1 has been clamped at its maximum

Description

4-2

Word 1

Word 2

Word 3

Word 4

Bits 0407

Bits 0003

Bits 0015

(0017)

Bits 0015

(0017)

Bits 0015

(0017)

Bits 0015

(0017)

High alarm bits. Set (1) if the input channel value is greater than the corresponding high alarm value. Bit 04  high alarm bit for channel 0 Bit 05  high alarm bit for channel 1 Bit 06  high alarm bit for channel 2 Bit 07  high alarm bit for channel 3

Low alarm bits. Set (1) if the input channel value is less than the corresponding low alarm value. Bit 00  low alarm bit for channel 0 Bit 01  low alarm bit for channel 1 Bit 02  low alarm bit for channel 2 Bit 03  low alarm bit for channel 3

Input data for channel 0.

Input data for channel 1.

Input data for channel 2.

Input data for channel 3.

Page 43

Chapter 4

Analog Block Applications Using

Block Transfers

Configuring the Module and Setting Outputs with Block

ransfer W

T

rite Instructions

You must configure your block module by performing a block transfer write (BTW) instruction from the programmable controller to the module. Each input can be independently configured in one BTW.

Maximum length of the BTW is 27 words (0 thru 26). When configuring the module, first send the complete BTW. You can shorten the BTW to 3 words for subsequent write operations if parameters for each channel remain the same.

Block transfer write data is shown in Figure 4.2.

Figure 4.2

T

ransfer W

Block

Decimal 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

0 Module Mode Scaling Range Alarm Enable Filter

1 Output Channel 0 Data

2 Output Channel 1 Data

3 Output Channel 0 Minimum Scaling

4 Output Channel 0 Maximum Scaling

5 Output Channel 1 Minimum Scaling

6 Output Channel 1 Maximum Scaling

7 Input Channel 0 Minimum Scaling

8 Input Channel 0 Maximum Scaling

9 Input Channel 1 Minimum Scaling

10 Input Channel 1 Maximum Scaling

11 Input Channel 2 Minimum Scaling

12 Input Channel 2 Maximum Scaling

13 Input Channel 3 Minimum Scaling

14 Input Channel 3 Maximum Scaling

15 Input Channel 0 Low Alarm Level

16 Input Channel 0 High Alarm Level

17 Input Channel 0 Alarm Deadband

18 Input Channel 1 Low Alarm Level

19 Input Channel 1 High Alarm Level

20 Input Channel 1 Alarm Deadband

21 Input Channel 2 Low Alarm Level

22 Input Channel 2 High Alarm Level

23 Input Channel 2 Alarm Deadband

24 Input Channel 3 Low Alarm Level

25 Input Channel 3 High Alarm Level

26 Input Channel 3 Alarm Deadband

rite for Analog Block I/O

4-3

Page 44

Chapter 4

Analog Block Applications Using Block Transfers

The bit/word descriptions are shown in Table 4.B.

Word

Word0

Word 0

Decimal

Bit

(Octal Bit)

Bits 1215 (1417)

Bits 1215 (1417)

Bits 1011 (1213)

Table 4.B Bit/Word

Descriptions for the Block T

Module Mode. Bits 1215 (1417) determine the operation of the block module.

Bit 15 (17) 14 (16) 13 (15) 12 (14)

0 0 0 0 Normal operation with voltage inputs

0 0 0 1 Normal operation with current inputs

1 1 0 0

Scaler Mode

Bit 11 (13) 10 (12) Mode Binary Counts  binary data sent to the

0 X binary

1 0 default

1 1 user

Default Scaling Values are shown below:

Bit 09

(11)

Range

Bit 08

(10)

Module

Module

Mode

Bit 12 (14)

0 0 0 10000 +10000 14 Bits

0 0 1 5000 +5000 13 Bits

1 0 1 20000 +20000 14 Bits

0 1 0 0000 +10000 13 Bits

0 1 1 0000 +5000 12 Bits

1 1 1 0000 +20000 14 Bits

Default scaling for the output is determined by the catalog number as follows:

ransfer W

Minimum

rite Instruction

Description

Calibration operation (refer to Chapter 7)

outputs and returned from the inputs is

outputsandreturnedfromtheinputsis

calibrated, but not scaled, providing maximum

possibleresolution

possible resolution.

User Scaling  the input and output data are

scaled by the values in words 3 thru 6 for

scaledbythevaluesinwords3thru6for

outputs, and words 7 thru 14 for inputs.

Default Default Approximate

Default

Default

Maximum

Approximate

Default Resolution

4-4

Catalog Number

1791N4V2, NDV 10000 +10000 14 Bits

1791N4C2, NDC 00000 +20000 13 Bits

Range selection bits. Bit 08 selects voltage and bit 09 selects unipolar or bipolar.

Bit

Bits 0809 (1011) 09 (11) 08 (10)

()

0 0 +10V

0 1 +5V

1 0 010

1 1 05

Alarm Enable bits. Enables input alarm when set (1). Bit 04 corresponds to channel 0, bit 05

Bits 0407

Bits 0003 Digital Filter selection. Default of 0000 selects No Filter. Refer to Table 4.C.

corresponds to channel 1, bit 06 corresponds to channel 2 and bit 07 corresponds to channel 3.

Range

Range

Default

Minimum

Default

Maximum

Approximate

Default Resolution

Page 45

Chapter 4

Analog Block Applications Using

Block Transfers

Word

Word 1 Bits 0015 (0017) Output data for channel 0.

Word 2 Bits 0015 (0017) Output data for channel 1.

Word 3 Bits 0015 (0017) Minimum engineering scale factors for output channel 0 data.

Word 4 Bits 0015 (0017) Maximum engineering scale factors for output channel 0 data.

Word 5 Bits 0015 (0017) Minimum engineering scale factors for output channel 1 data.

Word 6 Bits 0015 (0017) Maximum engineering scale factors for output channel 1 data.

Word 7 Bits 0015 (0017) Minimum engineering scale factors for input channel 0 data.

Word 8 Bits 0015 (0017) Maximum engineering scale factors for input channel 0 data.

Word 9 Bits 0015 (0017) Minimum engineering scale factors for input channel 1 data.

Word 10 Bits 0015 (0017) Maximum engineering scale factors for input channel 1 data.

Word 11 Bits 0015 (0017) Minimum engineering scale factors for input channel 2 data.

Word 12 Bits 0015 (0017) Maximum engineering scale factors for input channel 2 data.

Word 13 Bits 0015 (0017) Minimum engineering scale factors for input channel 3 data.

Word 14 Bits 0015 (0017) Maximum engineering scale factors for input channel 3 data.

Word 15 Bits 0015 (0017)

Word 16 Bits 0015 (0017)

Word 17 Bits 0015 (0017)

Decimal Bit

(Octal Bit)

Low alarm level for input channel 0. When the input value for this channel is less than the low value, the corresponding low alarm bit is set in the BTR.

High alarm level for input channel 0. When the input value for this channel is greater than the high value, the corresponding high alarm bit is set in the BTR.

Alarm deadband for input channel 0. This field creates a hysteresis effect on the low and high alarms. For an alarm condition to be removed, the input signal must go above the low alarm limit or below the high alarm limit by an amount equal to the specified deadband. Alarm deadband values must be less than or equal to one half the difference of the high and low alarm values.

Description

Word 18 Bits 0015 (0017)

Word 19 Bits 0015 (0017)

Word 20 Bits 0015 (0017)

Word 21 Bits 0015 (0017)

Word 22 Bits 0015 (0017)

Word 23 Bits 0015 (0017)

Word 24 Bits 0015 (0017)

Low alarm level for input channel 1. When the input value for this channel is less than the low value, the corresponding low alarm bit is set in the BTR.

High alarm level for input channel 1. When the input value for this channel is greater than the high value, the corresponding high alarm bit is set in the BTR.

Alarm deadband for input channel 1. This field creates a hysteresis effect on the low and high alarms. For an alarm condition to be removed, the input signal must go above the low alarm limit or below the high alarm limit by an amount equal to the specified deadband. Alarm deadband values must be less than or equal to one half the difference of the high and low alarm values.

Low alarm level for input channel 2. When the input value for this channel is less than the low value, the corresponding low alarm bit is set in the BTR.

High alarm level for input channel 2. When the input value for this channel is greater than the high value, the corresponding high alarm bit is set in the BTR.

Alarm deadband for input channel 2. This field creates a hysteresis effect on the low and high alarms. For an alarm condition to be removed, the input signal must go above the low alarm limit or below the high alarm limit by an amount equal to the specified deadband. Alarm deadband values must be less than or equal to one half the difference of the high and low alarm values.

Low alarm level for input channel 3. When the input value for this channel is less than the low value, the corresponding low alarm bit is set in the BTR.

4-5

Page 46

Chapter 4

Analog Block Applications Using Block Transfers

Word

Word 25 Bits 0015 (0017)

Word 26 Bits 0015 (0017)

Decimal Bit

(Octal Bit)

Description

High alarm level for input channel 3. When the input value for this channel is greater than the high value, the corresponding high alarm bit is set in the BTR.

Alarm deadband for input channel 3. This field creates a hysteresis effect on the low and high alarms. For an alarm condition to be removed, the input signal must go above the low alarm limit or below the high alarm limit by an amount equal to the specified deadband. Alarm deadband values must be less than or equal to one half the difference of the high and low alarm values.

Table 4.C

T

ime Selection

Filter

Bit Settings

Filter Time

Default  no filter 0 0 0 0

Do not use. 0 0 0 1

200ms 0 0 1 0

300ms 0 0 1 1

400ms 0 1 0 0

500ms 0 1 0 1

600ms 0 1 1 0

700ms 0 1 1 1

800ms 1 0 0 0

900ms 1 0 0 1

1000ms 1 0 1 0

1100ms 1 0 1 1

1200ms 1 1 0 0

1300ms 1 1 0 1

1400ms 1 1 1 0

1500ms 1 1 1 1

Bit 03 Bit 02 Bit 01 Bit 00

4-6

Page 47

Chapter

5

Analog Block Applications Using Discrete Transfers

Chapter

Objectives

Discrete Data Transfer

Input Data Format

In this chapter you will read about:

discrete data transfer input data format output data format

When used with SLC controllers, analog block data is transferred as discrete data using the 1747-SN remote I/O scanner module. The analog block uses 1/2 rack of memory in the I/O data table. The transferred words in the input image data table contain only input data from the module.

Discrete transfer programming moves data from the module to the processor’s data table in one I/O scan. The processor I/O scan initiates the request to transfer data from the module to the processor.

The input image table data format consists of four words. All four words are input data for the four input channels as shown in Table 5.A.

Figure 5.1 Discrete

Data T

ransfer Description - Input T

able 1/2 Rack

Decimal 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

0 Input Channel 0 Data

1 Input Channel 1 Data

2 Input Channel 2 Data

3 Input Channel 3 Data

5-1

Page 48

Chapter 5

Analog Block Applications Using Discrete Transfers

Table 5.A

Image T

Input

able

Output Data Format

Word

Word 0

Word 1

Word 2

Word 3

Bit - Decimal

(Bit - Octal)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Description

Input data for channel 0.

Input data for channel 1.

Input data for channel 2.

Input data for channel 3.

The output image table data format consists of four words. Word 0 is the configuration word consisting of the output enable bit (OE), module mode, scaling bit (SM), range select bits, and filter bits. SLC configuration word is a subset of the PLC except an enable output bit is added; alarms and user scaling are removed. Words 1 and 2 contain output data. Word 3 is reserved.

When using the analog block modules with an SLC controller, data is transferred as discrete data. The data is processed through a 1747-SN remote I/O scanner module.

The following tables show the word/bit assignments for both discrete input and output transfer.

Figure 5.2 Discrete

Decimal 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

0 OE Module Mode SM Range Filter

1 Output Channel 0 Data

2 Output Channel 1 Data

3 Not used

Data T

ransfer Description - Output T

able 1/2 Rack

5-2

Page 49

Chapter 5

Analog Block Applications Using Discrete Transfers

Word

Word 0

Table 5.B Bit/Word

Decimal

Bit

(Octal Bit)

Output Enable Bit OE

Bit15(17)

Bit 15 (17)

Bits1214

Bits 12-14

(14-16)

(14-16)

Bit 11

Bit 11

(13)

(3)

Bits 08-09

Bits 0809

(10-11)

Bits 00-03 Digital Filter selection. Default of 0000 selects No Filter. Refer to Table 5.B.

Bit 15 (17)

Module Mode. Bits 12 thru 14 determine the operation of the block module.

Scaler Mode bit SM

Bit 11 (13) Mode

Bit 11 (13)

Default scaling for the output is determined by the catalog number as follows:

Range selection bits. Bit 08 (10) selects voltage and bit 09 (11) selects unipolar or bipolar mode.

Bit 09 (11) Bit 08 (10) Range

Descriptions for Discrete Data T

0 Outputs are held at 0.

1 Both outputs are enabled.

14 (16) 13 (15) 12 (14)

0 0 0 Normal operation with voltage inputs

0 0 1 Normal operation with current inputs

1 0 0 Calibration operation

Binary Counts - binary data sent to the outputs and returned from the

0 binary

1 default

1 user

Module

Mode

Mode

Bit 09 (11) Bit 08 (10)

0 0 0 -10000 +10000 14 Bits

0 0 1 -5000 +5000 13 Bits

1 0 1 -20000 +20000 14 Bits

0 1 0 0000 +10000 13 Bits

0 1 1 0000 +5000 12 Bits

1 1 1 0000 +20000 14 Bits

Catalog Number

1791N4V2, NDV -10000 +10000 14 Bits

1791N4C2, NDC 00000 +20000 13 Bits

0 0 +10V

0 1 +5V

1 0 0-10

1 1 0-5

Binary Counts - binary data sent to the outputs and returned from the inputs is calibrated, but not scaled, providing maximum possible

inputs is calibrated, but not scaled, providing maximum possible resolution.

Default Scaling - When this bit is set to 1, default scaling is in effect.

DefaultScalingWhenthisbitissetto1defaultscalingisineffect

Range

ransfer - Output T

Description

Note: To calibrate, you must set the Output

Note: To calibrate, you must set the Output

Enable Bit to 1 (refer to Chapter 7).

Default Default Approximate

Default

Minimum

Default

Minimum

able 1/2 Rack

Default

Maximum

Default

Maximum

Approximate

Default Resolution

Approximate

Default Resolution

Word 1 Bits 00-15 (0017) Output data for channel 0.

Word 2 Bits 00-15 (0017) Output data for channel 1.

Word 3 Bits 00-15 (0017) Not used.

5-3

Page 50

Chapter 5

Analog Block Applications Using Discrete Transfers

Table 5.C

T

ime Selection

Filter

Bit Settings

Filter Time

Default - no filter 0 0 0 0

Do not use. 0 0 0 1

200ms 0 0 1 0

300ms 0 0 1 1

400ms 0 1 0 0

500ms 0 1 0 1

600ms 0 1 1 0

700ms 0 1 1 1

800ms 1 0 0 0

900ms 1 0 0 1

1000ms 1 0 1 0

1100ms 1 0 1 1

1200ms 1 1 0 0

1300ms 1 1 0 1

1400ms 1 1 1 0

1500ms 1 1 1 1

Bit 03 Bit 02 Bit 01 Bit 00

5-4

Page 51

Chapter

6

Programming Your Analog Block I/O Module

Chapter

Objectives

Block Transfer Programming

In this chapter, we describe

block transfer programming sample programs in the PLC-3 and PLC-5 processors module scan time issues

Your module communicates with the processor through bidirectional block transfers. This is the sequential operation of both read and write block transfer instructions.

For the analog block I/O modules, block transfer writes (BTWs) can perform two different functions.

If you want to: Description This type of BTW is called:

configure the module

send data to the output channels of those modules having outputs

This involves setting the bits which enable the programmable features of the module, such as scaling, alarming, real time sampling, etc.

This type of BTW is generally shorter in length than the configuring BTW because it does not configure the module each time it is initiated.

the configuration BTW"

the output update BTW"

The following example programs are minimum programs; all rungs and conditioning must be included in your application program. You can disable BTRs, or add interlocks to prevent writes if desired. Do not eliminate any storage bits or interlocks included in the sample programs. If interlocks are removed, the program may not work properly.

Your analog module works with a default configuration upon powerup as long as a block transfer write (BTW) has not been initiated. The default mode is binary scaling and the input range is +/–10V. In the default mode, the alarms are off and the outputs are reset at 0.

Your program should monitor status bits (such as power up status, bad configuration, output out of range, alarms, etc.) and block transfer read activity.

The following example programs illustrate the minimum programming required for communication to take place.

6-1

Page 52

Chapter 6

Programming Your Analog Module

PLC3

rogram Action

Program Example

At powerup, the user program examines the BTR done bit in the block transfer read file, initiates a write block transfer to configure the module, and then does consecutive read and write block transfers continuously

.

Block transfer instructions with the PLC-3 processor use one binary file in a data table section for module location and other related data. This is the block transfer control file. The block transfer data file stores data that you want transferred to the module (when programming a block transfer write) or from the module (when programming a block transfer read). The address of the block transfer data files are stored in the block transfer control file.

The programming terminal prompts you to create a control file when a block transfer instruction is being programmed. The same block transfer

control file is used for both the read and write instructions for your module. A different block transfer control file is required for every

module.

A sample program segment with block transfer instructions is shown in Figure 6.1, and described below.

Figure 6.1

Family Sample Program Structure

PLC3

BTR

BLOCK XFER READ Block Transfer Read Done Bit

1

RACK:

GROUP:

MODULE:

DATA:

LENGTH:

CNTL:

XXX

X = XXXX

XXXX:XXXX

XXXX:XXXX

Enable

EN

12

X

Done

DN

15

00

Error

ER

13

6-2

Block Transfer

rite Done Bit

2

W

BTW BLOCK XFER WRITE RACK: GROUP: MODULE: DATA: LENGTH: CNTL:

X = XXXX

XXXX:XXXX

XXXX:XXXX

XXX

Enable

EN

02

Done

X

DN

05

Error

00

ER

03

Page 53

Chapter 6

Programming Your Analog Module

PLC5

and PLC-5/250

Program Example

Program Action

At

powerup, the program enables a block transfer read. Then, it initiates one block transfer write to configure the module (rung 2). Thereafter

, the program continuously does

block reads and writes.

This program is very similar to the PLC-3 program with the following exceptions:

Use enable bits instead of done bits as the conditions on each rung.

Use separate control files for each block transfer instruction. Refer to

Appendix B.

Figure 6.2 PLC5

Family Sample Program Structure

BTR Enable

1

15

BTR

Enable

2

15

BTW Enable

N7:5N7:0

15

BTW

Enable

N7:5N7:0

15

PU

N10:0

15

BTR BLOCK XFER READ RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

BTW

BLOCK XFER WRITE RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

N7:0

N10:0

N7:5

N10:10

EN

1 0

DN

0

ER

5

N

EN

1 0

DN

0

ER

27

N

BTR

Enable

3

15

BTW

Enable

N7:5N7:0

15

PU

N10:0

15

BTW

BLOCK XFER WRITE RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

N7:10

N10:10

EN

1 0

DN

0

ER

3

N

6-3

Page 54

Chapter 6

Programming Your Analog Module

Sample Programs for Analog Block

PLC3 Family Processors

The following are sample programs for using your modules more efficiently when operating with the PLC-3 or PLC-5 family processors.

These programs show you how to:

configure the module read data from the module update the output channels

Refer to the proper PLC-3 or PLC-5 documentation for additional information on processor programming and data entry.

An analog block requires BTWs or discrete data to configure it and update its output data. BTRs or discrete data are required to send back input data and module status.

The following PLC-3 program can be altered to effectively address analog block modules.

Figure 6.3

Family Sample Program Structure

PLC3

BTR

BLOCK XFER READ Block Transfer Read Done Bit

1

Block Transfer

rite Done Bit

Pushbutton

2

Power-up

Bit

W

RACK:

GROUP:

MODULE:

DATA:

LENGTH:

CNTL:

X = XXXX

XXXX:XXXX

XXXX:XXXX

MOV SOURCE:

DESTINATION:

(BTW LENGTH)

XXX

Enable

EN

12

X

Done DN

15

0

Error

ER

13

XXX

27

XXX

6-4

Pushbutton

Power-up

3

Block Transfer

W

4

Bit

rite Done Bit

Block Transfer

rite Done Bit

W

MOV SOURCE:

DESTINATION:

BTW BLOCK XFER WRITE RACK: GROUP: MODULE: DATA: LENGTH: CNTL:

XXXX:XXXX

XXXX:XXXX

(OUTPUTS + 1)

(BTW LENGTH)

XXX

X

X = XXXX

0

XXX

XXX

Enable

EN

Done

DN

Error

ER

03

02

05

Page 55

Chapter 6

Programming Your Analog Module

PLC5

Family Processors

The following PLC-5 program is very similar to the PLC-3 program with the following exceptions:

You must use enable bits instead of done bits as the conditions on each

rung.

Rungs 2 and 3 have been replaced with 1 rung.

A separate control file must be selected for each of the block transfer

instructions.

Figure 6.4 PLC5

Family Sample Program Structure

BTR

BTR Enable

1

Pushbutton

2

Powerup Bit

BTW Enable

BTW

Enable

BLOCK XFER READ RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

BTW

BLOCK XFER WRITE RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

XXX:XX XXX:XX

XXX:XX XXX:XX

00

00

EN

X X

DN

X

ER

N

EN

X X

DN

X

ER

N

BTR

Enable

3

Note: In rungs 2 and 3 the BTW instructions would have the same data files, but different control files.

* Length = (number of outputs + 1) words.

BTW

Enable

BTW

BLOCK XFER WRITE RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

XXX:XX XXX:XX

EN

X X

DN

X

ER

*

N

6-5

Page 56

Module Calibration

Chapter

7

Chapter

Objective

Tools and Equipment

Calibrating your Module

In this chapter we tell you how to calibrate your module.

To calibrate your analog module, you will need the following tools and equipment:

Tool or Equipment Description

Precision Voltage Source

Precision Multimeter

Programming Terminal and Interconnect Cable

Your analog module is shipped already calibrated from the factory. To recalibrate the module, it must be able to communicate with the processor and a programming terminal.

If the processor has block transfer capability, you must enter ladder logic into the processor memory before calibrating the module. You can then initiate BTWs to the module, and the processor can read inputs from the module (BTRs).

0-10V, 1µV resolution 25mA, 1µA resolution

10V, 1

µV resolution

Programming terminal for A-B family processors

Table 7.A Calibration

Discrete Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Discrete Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Word 0 1 1 0 0 WR IM EX HL O1 O0 I3 I2 I1 I0

Word 1 Output Channel 0 Calibration Data

Word 2 Output Channel 1 Calibration Data

Block Transfer W

rite Data File or Discrete Output Data File

7-1

Page 57

Chapter 7

Module Calibration

Word

Word 0

Table 7.B Calibration

Decimal

(Octal Bit)

Bit 00 Input select bit. Indicates input channel 0 being calibrated.

Bit 01 Input select bit. Indicates input channel 1 being calibrated.

Bit 02 Input select bit. Indicates input channel 2 being calibrated.

Bit 03 Input select bit. Indicates input channel 3 being calibrated.

Bit 04 Output select bit. Indicates output channel 0 being calibrated.

Bit 05 Output select bit. Indicates output channel 1 being calibrated.

Bit 06

Bit 07

Bit 08 (10)

Block Transfer W

Bit

High/low bit HL. Indicates whether full scale or zero data point is being updated: Bit 06 = 1 - full scale Bit 06 = 0 - zero data point

Execute Bit. EX. When set (1), starts calibration and updates the selected channels.

Input Mode Bit IM. Bit 08 (10) = 0 - Use for voltage inputs. Input scaling in mV

Bit 08 (10) = 1 - Use for current inputs. Input scaling in µA

rite or Discrete Output Bit/Word Descriptions

Description

Bits 910 (1112) Not used

Bit 11 (13)

Bits 1215 (1417) Calibration mode bits. Set to 1100 to select a calibration sequence.

Word 1 Bits 0015 (0017)

Word 2 Bits 0015 (0017)

EEPROM write bit OK. When set (1), requests the current calibration data be saved.

Output Channel 0 Calibration Data - user entered calibration data when EX = 0 (bit 07 in word 0), scaled and corrected output data when DN bit (bit 07 in BTR) = 1.

Output Channel 1 Calibration Data - user entered calibration data when EX = 0 (bit 07 in word 0), scaled and corrected output data when DN bit (bit 07 in BTR) = 1.

Table 7.C Calibration

Word/ Octal Bit 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Word/Decimal Bit 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

0 1 1 0 0 OK IM DN HL O1 O0 I3 I2 I1 I0

1 Corrected Input Channel 0 Data

2 Corrected Input Channel 1 Data

3 Corrected Input Channel 2 Data

4 Corrected Input Channel 3 Data

Block Transfer Read Data File

7-2

Page 58

Chapter 7

Module Calibration

Table 7.D Calibration

Word Decimal

(Octal Bit)

Bit 00

Bit 01

Bit 02

Bit 03

Bit 04

Bit 05

Word 0

Bit 06

Bit 07

Block T

Bit

ransfer Read or Discrete Input Bit/Word Descriptions

Description

Input calibration error bit. When set, indicates input channel 0 calibration error.

Input calibration error bit. When set, indicates input channel 1 calibration error.

Input calibration error bit. When set, indicates input channel 2 calibration error.

Input calibration error bit. When set, indicates input channel 3 calibration error.

Output calibration error bit. When set, indicates output channel 0 calibration error.

Output calibration error bit. When set, indicates output channel 1 calibration error.

High/Low bit HL. Indicates whether full scale or zero data point is being updated: Bit 6 = 1 - full scale Bit 6 = 0 - zero data point

Calibration Done bit DN. When set (1), indicates calibration started and selected channels updated.

Input Mode bit IM.

Bit 08 (10)

Bits 0910 (1112)

Bit 11 (13)

Bits 1215 (1417)

Word 1 Bits 0015 (0017) Corrected Input Data for Channel 0 using most recent calibration data.

Word 2 Bits 0015 (0017) Corrected Input Data for Channel 1 using most recent calibration data.

Word 3 Bits 0015 (0017) Corrected Input Data for Channel 2 using most recent calibration data.

Word 4 Bits 0015 (0017) Corrected Input Data for Channel 3 using most recent calibration data.

Bit 8 = 0 - Use for voltage inputs. Input scaling in mV

Bit 8 = 1 - Use for current inputs. Input scaling in µA

Not used.

EEPROM OK bit (OK). When set, indicates the calibration data has been saved.

Calibration mode bits. Indicates the calibration sequence is selected.

7-3

Page 59

Chapter 7

Module Calibration

Table 7.E

T

Discrete

Word/Bit Description

0 Corrected Input Channel 0 Data

1 Corrected Input Channel 1 Data

2 Corrected Input Channel 2 Data

3 Corrected Input Channel 3 Data

ransfer Input Data File

Table 7.F Discrete

Word/Bit Description

0 Corrected Input Data for Channel 0 using most recent calibration data.

1 Corrected Input Data for Channel 1 using most recent calibration data.

2 Corrected Input Data for Channel 2 using most recent calibration data.

3 Corrected Input Data for Channel 3 using most recent calibration data.

Transfer Input Bit/W

ord Descriptions

Calibrating Voltage Inputs

Use the procedure below to calibrate the voltage inputs on your analog block I/O module. The procedure can be used for either PLC or SLC systems.

You can calibrate any single input or output individually or, you can calibrate them simultaneously.

Important: To allow the module to stabilize, energize the module for at least 30 minutes before calibrating.

To calibrate your module:

1. Connect your test equipment for the input you want to calibrate. This

is shown in the figure below.

V

IN

I

IN

RET

0-10V

Reference Source

V

R

V

7-4

GND

Page 60

Chapter 7

Module Calibration

Important: You can calibrate all four inputs simultaneously by wiring them in parallel.

2. Verify normal operation.

3. Select calibration mode, voltage input mode and the input channels

you want to calibrate.

For example, to calibrate input channel 0, set bits 15 (17), 14 (16) and 01 of BTW word 0 (C001h).

4. Apply 0.000V to inputs.

5. Set the EX bit (bit 07 of BTW word 0).

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

6. Reset (0) the EX bit (BTW word 0, bit 07) and set (1) the HL bit

(BTW word 0, bit 06).

7. Apply full scale voltage (+10.000V) to the inputs you are calibrating.

8. Set (1) the EX bit.

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

9. Verify the input calibration by doing the following:

Make sure your terminal is in decimal radix mode

Important: Input values are scaled in millivolts.

Vary the input reference over +10V range.

Ensure the module input indications in the appropriate BTR words

are within acceptable limits.

Repeat steps 3–9 if necessary

Important: At this point, if you are not satisfied with your calibration, you can cycle power to the block to restore the previous calibration constants. If you move on to Step 10 of this procedure, the present calibration data constants will overwrite the previous constants, making the previous constants inaccessible.

7-5

Page 61

Chapter 7

Module Calibration

10. Set (1) the WR bit 11 (13) in BTW word 0.

For PLC systems: Monitor the OK bit 11 (13) in BTR word 0 until

it is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

11. Exit the calibration mode.

Calibrating Current Inputs

Use the procedure below to calibrate the current inputs on your analog block I/O module. The procedure can be used for either PLC or SLC systems.

You can calibrate any single input or output individually or, you can calibrate them simultaneously.

Important: To allow the module to stabilize, energize the module for at least 30 minutes before calibrating.

To calibrate your module:

1. Connect your test equipment for the input you want to calibrate. This

is shown in the figure below.

0-5V or 0-20mA Reference Source

A

V

R

V

IN

I

IN

RET

GND

Important: To calibrate four current inputs simultaneously, you need four independant current sources.

2. Verify normal operation.

7-6

3. Select calibration mode, current input mode and the input channels

you want to calibrate.

For example, to calibrate input channel 0, set bits 15 (17), 14 (16), 08 (10) and 01 of BTW word 0 (C101h).

4. Apply 0.000 milliamps to inputs.

Page 62

Chapter 7

Module Calibration

5. Set the EX bit (bit 07 of BTW word 0).

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

6. Reset (0) the EX bit (BTW word 0, bit 07) and set (1) the HL bit

(BTW word 0, bit 06).

7. Apply full scale current (+20.000 milliamps) to the inputs you are

calibrating.

8. Set (1) the EX bit.

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

9. Verify the input calibration by doing the following:

Make sure your terminal is in decimal radix mode

Important: Input values are scaled in microamps.

Vary the input reference over the 0 to 20 milliamps range.

Make sure the module input indications in the appropriate BTR

words are within acceptable limits.

Repeat steps 3–9 if necessary

Important: At this point, if you are not satisfied with your calibration, you can cycle power to the block to restore the previous calibration constants. If you move on to Step 10 of this procedure, the present calibration data constants will overwrite the previous constants, making the previous constants inaccessible.

10. Set (1) the WR bit 11 (13) of BTW word 0.

For PLC systems: Monitor the OK bit 11 (13) of BTR word 0 until

it is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

11. Exit the calibration mode.

7-7

Page 63

Chapter 7

Module Calibration

Calibrating Voltage Outputs (1791N4V2 and 1791NDV)

Use the procedure below to calibrate voltage outputs of the analog block I/O module. The procedure can be used for either PLC or SLC systems.

The most accurate results are obtained by installing an optional load resistor which approximates the output load for the intended application.

Important: To allow the module to stabilize, energize the module for at least 30 minutes before calibrating.

To calibrate your module:

1. Connect your test equipment for the output you want to calibrate.

This is shown in the figure below.

1791N4V2

V

O

V

RET

and 1791NDV

Optional Load

V

Important: You can calibrate both outputs simultaneously.

2. Verify normal operation.

3. Select the calibration mode and the output and input channels you

want to calibrate.

For example, to calibrate input channel 0, set bits 15 (17), 14 (16), and 04 of BTW word 0 (C010h).

4. Measure the zero point with a precision meter. Enter the measured

voltage in millivolts into the BTW word (word 1 for channel 0, word 2 for channel 1).

7-8

5. Set the EX bit (bit 07 of BTW word 0).

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

Page 64

Chapter 7

Module Calibration

6. Reset (0) the EX bit (BTW word 0, bit 07) and set (1) the HL bit

(BTW word 0, bit 06).

7. Measure the full scale point with a precision meter. Enter the

measured voltage in millivolts into the BTW word (word 1 for channel 0, word 2 for channel 1).

8. Set (1) the EX bit.

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

9. Verify the input calibration by doing the following:

Make sure your terminal is in decimal radix mode

Important: Output values are scaled in millivolts.

Vary the output value in the appropriate BTW words over the

10V range.

+

Make sure the meter indicates the outputs are within acceptable

limits.

Repeat steps 3–9 if necessary

Important: At this point, if you are not satisfied with your calibration, you can cycle power to the block to restore the previous calibration constants. If you move on to Step 10 of this procedure, the present calibration data constants will overwrite the previous constants, making the previous constants inaccessible.

10. Set (1) the WR bit 11 (13) of BTW word 0.

For PLC systems: Monitor the OK bit 11 (13) of BTR word 0 until

it is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

11. Exit the calibration mode.

7-9

Page 65

Chapter 7

Module Calibration

Calibrating Current Outputs (1791N4C2 and 1791NDC)

Use the procedure below to calibrate current outputs of the analog block I/O module. The procedure can be used for either PLC or SLC systems.

You can calibrate any single input or output individually or, you can calibrate them simultaneously.

Important: To allow the module to stabilize, energize the module for at least 30 minutes before calibrating.

To calibrate your module:

1. Connect your test equipment for the input you want to calibrate. This

is shown in the figure below.

I

RET

1791N4C2

I

O

and 1791NDC

Optional Load

A

Important: You can calibrate both outputs simultaneously.

2. Verify normal operation.

3. Select the calibration mode and the output and input channels you

want to calibrate.

For example, to calibrate input channel 0, set bits 15 (17), 14 (16), and 04 of BTW word 0 (C010h).

4. Measure the zero point with a precision meter. Enter the measured

current in milliamps into the BTW word (word 1 for channel 0, word 2 for channel 1).

7-10

5. Set the EX bit (bit 07 of BTW word 0).

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

Page 66

Chapter 7

Module Calibration

6. Reset (0) the EX bit (BTW word 0, bit 07) and set (1) the HL bit

(BTW word 0, bit 06).

7. Measure the full scale point with a precision meter. Enter the

measured current in milliamps into the BTW word (word 1 for channel 0, word 2 for channel 1).

8. Set (1) the EX bit.

For PLC systems: Monitor the DN bit (BTR word 0, bit 07) until it

is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

9. Verify the input calibration by doing the following:

Make sure your terminal is in decimal radix mode

Important: Output values are scaled in microamps.

Vary the output value in the appropriate BTW words over the 0 to

20 milliamp range.

Make sure the meter indicates the outputs are within acceptable

limits.

Repeat steps 3–9 if necessary

Important: At this point, if you are not satisfied with your calibration, you can cycle power to the block to restore the previous calibration constants. If you move on to Step 10 of this procedure, the present calibration data constants will overwrite the previous constants, making the previous constants inaccessible.

10. Set (1) the WR bit 11 (13) of BTW word 0.

For PLC systems: Monitor the OK bit 11 (13) of BTR word 0 until

it is set (1).

For SLC systems: Allow at least 5 seconds before continuing.

11. Exit the calibration mode.

7-11

Page 67

Chapter 7

Module Calibration

Calibration Example for the 1791N4V2 Block I/O Module

The following example shows you how to calibrate the inputs and outputs for the 1791-N4V2 block I/O module.

1. For inputs – short all RET and GND together and short V

0 thru Vin3

in

together. Connect voltage sources and meter between Vin and GND. For outputs – connect meter and load to each output.

2. Verify normal operation.

3. Set the terminal radix to hexidecimal and set BTW word 0 to C03Fh.

4. Set the voltage source to 0.000V and set the terminal radix to

decimal. Enter the output meter reading in BTW words 1 and 2.

5. Set the terminal radix to hexidecimal and set BTW word 0 to C0BFh.

6. Set BTW word 0 to C07Fh.

7. Set the voltage source to 10.000V and set the terminal radix to

decimal. Enter the output meter reading in BTW words 1 and 2.

8. Set the terminal radix to hexidecimal and set BTW word 0 to C0FFh.

9. Set the terminal radix to decimal and verify module operation.

10. Set the terminal radix to hexidecimal and set BTW word 0 to C8FFh.

7-12

11. Return to normal default operation by setting BTW word 0 to 0800h.

Page 68

Troubleshooting

Chapter

8

Chapter

Objectives

Module Indicators

In this chapter you will learn about the indicators on the block I/O module, and how to use them to troubleshoot the unit.

Each block I/O module has indicators (Figure 8.1) which provide indication of module status. Each module has the following:

Indicator Color Quantity Description

COMM Green 1

FAULT Red 1 Indicates hardware or software error, and if communication has failed

POWER Green 1 When on, indicates that the module is powered up

Figure 8.1 shows the location of the indicators. Refer to Table 8.A for status indications reported by the indicators.

Figure 8.1 Indicators

on the Block I/O Module

Indicates whether communication is occurring between processor or scanner and the block module

Power Indicator

(green)

Communication

Indicator

(green)

Fault Status

Indicator

(red)

12404-I

8-1

Page 69

Chapter 8

Troubleshooting

Table 8.A Troubleshooting

Indication Description

Power OFF

COMM OFF

FAULT OFF

COMM

and F

communicating with the block.

Chart

No power

ON

ON Flashing

ON Flashing

AUL

Power okay

Communications not established Communication established Reset commands being received in Program mode

Normal Error (hardware or software), block power low COMM FAIL - communication cable disconnected, 100ms between valid frames, no more than 255 valid frames between valid frames addressed to block, 20ms idle time exceeded.

T will alternately flash when processor restart lockout is selected, a fault has occurred and the processor is

8-2

Page 70

Page 71

Page 72

Page 73

Page 74

Page 75

Page 76

Page 77

Page 78

Index

B

block compatibility, 11

block I/O, 13

installing, 23 pre-installation, 21

block transfer, 11

block transfer instructions, 41

block transfer programming, 61

block transfer read, 41

bit/word descriptions, 42

block transfer write, 43, 61

bit/word descriptions, 44 filter time selections, 46

C

calibration

block transfer write, 71, 72, 73 current inputs, 76 current outputs (1791-N4C2 and -NDC),

710

tools, 71 voltage inputs, 74 voltage outputs (1791-N4V2 and -NDV),

78

communication, 11

compatibility, 11

extended node numbers, 215

configuration switches, 31

connecting block I/O, in a PLC system,

13, 14

connecting wiring, 1791-IOBA, 25, 26,

27, 28

E

extended node capability, 214

F

features, 12

I

image table usage, 35, 36

one assigned rack number, 35, 36

input channel, 14

input data format, 51

inputs, 11

current inputs, 15 voltage inputs, 15

L

LED indicators, 81

M

mounting dimensions, 23

O

output data format, 52

outputs, 12

current outputs, 110 voltage outputs, 19

P

D

default configuration, 61

description, 11

differential input mode, 15

discrete data tranfer, word/bit assignments,

52

discrete data transfer, 51

filter time selections, 54

discrete transfer, 11

programming example

PLC-3, 62 PLC-5, 63

R

range scale, 15

related publications, P2

remote I/O link, selecting speed, 215

remote I/O link connector, 12

Page 79

I–2

Index

remote I/O link wiring, 213

S

sample programs

analog block, 64 PLC-3, 64 PLC-5, 65

scaling, 16

scaling methods, 17

binary counts, 17 default scaling, 17 user scaling, 18

scan time, 37

selectable input ranges, 14

series connections

PLC, 213 SLC, 214

single-ended input mode, 15

specifications, A1

1791-N4C2, A1

1791-N4V2, A3 1791-NDC, A5 1791-NDV, A7

status indicators, 12, 81

switch assembly, 12

T

terminal strip, 12

termination resistor, 213

throughput requirements, 215

troubleshooting chart, 82

types of block I/O, 11

W

wiring

cables, 212 connections, 24 designations, 211

wiring connections, definitions, 210, 212

Page 80

AllenBradley has been helping its customers improve productivity and quality for 90 years. AB designs, manufactures and supports a broad range of control and automation products worldwide. They include logic processors, power and motion control devices, manmachine interfaces and sensors. AllenBradley is a subsidiary of Rockwell International, one of the world's leading technology companies.

With major offices worldwide.

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Argentina • Australia • Austria • Bahrain Republic • Denmark • Ecuador Indonesia • Israel

Poland • Portugal • Puerto Rico • Qatar • Romania • Russia-CIS • Saudi Arabia • Singapore

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aiwan

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orld Headquarters, AllenBradley

• Italy • Jamaica •

The Netherlands

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• T

, 1201 South Second Street, Milwaukee, WI 53204 USA, T

• Belgium • Brazil •

Bulgaria • Canada

Germany • Greece • Guatemala • Honduras • Hong Kong • Hungary

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urkey • United Arab Emirates • United Kingdom • United States • Uruguay

• Chile •

China, PRC • Colombia

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• Costa Rica •

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South Africa, Republic

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enezuela

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el: (1) 414 3822000 Fax: (1) 414 3824444

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Publication

Supersedes

1791-6.5.5 - March 1994

publication 17916.5.5 dated April 1993

Copyright

1994 AllenBradley Company

P/N

9551

, Inc. Printed in USA

15-92

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