Digital Equipment VT 14 Manual de usuario

VT14

USERS

MANUAL

i/'n'U-l^f «'»„,„

i1/.T -.•

t^C^:

INDUSTRIAL 14 FAMILY

OF CONTROLLERS

DEC-14-GVTMA-A-D

VT14

USER'S MANUAL

DIGITAL EQUIPMENT CORPORATION •MAYNARD, MASSACHUSETTS

1st Edition, February 1974

The material in this manual is for informational

purposes and is subject to change without notice.

Digital Equipment Corporation assumes no respon-

sibility for any errors which may appear in this

manual.

Printed in U.S.A.

The following are trademarks of Digital Equipment

Corporation, Maynard, Massachusetts:

DEC PDP

FLIP CHIP FOCAL

DIGITAL COMPUTER LAB

CONTENTS

Page

CHAPTER 1GETTING ON THE AIR

LET'S ENTER ACIRCUIT 1-2

ENTERING ALARGER CIRCUIT 1-2

CORRECTING AMISTAKE WITHIN ACIRCUIT 1-3

CORRECTINGCIRCUITS ALREADY STORED IN 14 MEMORY 1-3

RUNNING THE CONTROL PROGRAM 1-3

ENTERING ATIMER OR ACOUNTER CIRCUIT 1-3

SUMMARY 1-4

CHAPTER 2WRITING YOUR CONTROL PROGRAM

I/O NUMBERS 2-1

INTERNAL I/O GROUPINGS 2-1

ADJUSTING THE INTERNAL I/O GROUPING 2-3

OUTPUT CIRCUITS 2-3

RETENTIVE MEMORIES 2-6

SHIFT REGISTERS 2-6

TIMERS 2-7

EVENT COUNTERS 2-9

UP/DOWN COUNTERS 2-10

NON-RETENTIVE INTERNAL FUNCTIONS 2-11

CIRCUITS CONTAINING INPUTS THAT ARE WIRED NORMALLY-CLOSED 2-11

CHAPTER 3ENTERING THE PROGRAM

CLEARING 14 MEMORY 3-1

ENTERING ACIRCUIT 3-1

STORING CIRCUITS 3-5

EDITING CIRCUITS 3-5

REMOVING A CIRCUIT FROM MEMORY 3-6

DISPLAYING ACIRCUIT 3-7

ENTERING ASHIFT CIRCUIT 3-7

PRESETTING TIMERS, EVENT COUNTERS, AND UP/DOWN COUNTERS 3-8

ENTRY ERRORS 3-8

CHAPTER 4ON-LINE USE OF THE VT14

CHECKING I/O STATUS 4-1

RUNNING THE CONTROL PROGRAM 4-1

MONITORING ACONTROL CIRCUIT 4-1

SUMMARY OF VT14 MODES 4-2

Force I/O Mode 4-2

Disabling I/O Points 4-2

Forcing Disabled I/O 4-4

Using the Disable/Force Feature 4-4

Forcing An Enabled Output 4-5

CHANGING A CIRCUIT 4-6

HINTS FOR THE USE OF THE VT14 4-6

III

CONTENTS (Cont)

Page

APPENDIX AVT14 PROGRAM DOCUMENTATION

APPENDIX BCASCADING ATIMER AND COUNTER

APPENDIX CVT14 INSTALLATION

APPENDIX DCIRCUIT GRID FORMS

Figure No.

1-1

1-2

1-3

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

2-1 la

2-1 lb

2-1 2a

2-1 2b

2-1 3a

2-1 3b

2- 14a

2- 14b

2-15

2-16

2-17

2-18

2-19

3-1

3-2

3-3

ILLUSTRATIONS

Title Page

VT1 4Programming Terminal 1'^

ASimple Control Circuit ^"2

AMore Complex Control Circuit 1-2

I/O Partitioning 2-1

Internal I/O Groupings 2-1

Industrial 14 Circuit Format 2-4

VT14 Circuit Rules 2-5

Retentive Memory Circuit to Record Full-Depth Reached 2-6

Shift Register Circuit to Track aReject Part 2-6

General SR Parallel Load Circuit 2-7

Industrial 14 Memory Allocation for Shift Registers 2-7

Linking Two Shift Registers 2-7

Timing Circuit Operation 2-7

Timing Diagram 2-8

On-Delay Timer Circuit 2-8

Timer Lock-Up Circuit 2-8

Off-Delay Timer Circuit 2-8

Circuit to Energize an Output for aFixed Interval After

De-Energization of an Input 2-9

Circuit to Energize an Output for aFixed Interval After

De-Energization of an Input 2-9

Event Counter Circuit to Shut Down aStation After

Three Successive Bad Parts 2-9

Up/Down Counter Circuit to Limit Parts

on aConveyor to aMaximum of Six 2-10

Clear Timer if Power is Lost 2-11

Circuit to Clear One Bit of aShift Register on Power Failure 2-11

Start/Stop Circuit with N/O and N/C Contacts 2-12

Sample Control Circuit 3-1

VT14 Display Positions 3-4

Sample Circuit Showing Grid Positions 3-4

ILLUSTRATIONS (Cont)

Figure No. Title Page

3-4 Procedure for Changing aNormally-Open Contact to a

Normally-Closed Contact 3-5

3-5 Procedure for Changing the Position of an Element 3-6

3-6 Procedure to Display aCircuit 3-7

3-7 ATypical Shift Register Control Circuit 3-7

3-8 Timer (or Counter) Output 1710 Preset to 369 Seconds (Counts) 3-8

3-9a Typical Control Circuit Containing an Illegal Vertical Contact 3-8

3-9b Reformatted to Emphasize the Vertical Contact 3-9

3-9c Circuit 3-9a in Legal Format 3-9

3-10a Branches Illegally Offset 3-9

3-10b An Element Illegally Drawn Between an Up-Branch and aDown-Branch 3-9

4-1 Sampling Input 476 4-1

4-2 Typical Display of Intensified Control Circuit Symbols 4-2

4-3 Disabling Inputs and Outputs from the VT14 4-3

4-4 Input 0476 Disabled 4-3

4-5 Contact 0476 Forced On 4-4

4-6 Automatic-Cycle-Light Control Circuit 4-4

4-7 Disabling and Forcing On the CYCLE START and MAIN CYCLE Contacts 4-5

4-8 Sample Circuit to Display Input States 4-7

B-1 Cascading a60-Second Timer With a60-Minute Counter B-1

D-1 Circuit Entry Grid Forms D-2

TABLES

Table No. Title Page

2-1 Typical Assignment of Internal I/O Numbers 2-2

2-2 Possible Internal Function Groupings 2-3

2-3 Up/Down Counters 2-10

2-4 Meaning of Circuit Symbols and Wiring Conditions 2-12

3-1 Step-by-Step Circuit Entry Procedure 3-2

4-1 VT14 Modes of Operation 4-2

INTRODUCTION

The VT14 Programming Terminal is connected to the

Industrial 14/30 and 14/35 Controllers for programming

operations. It has an easy-to-use keyboard for entering,

displaying, and editing controller programs in ladder dia-

gram form. These diagrams can be checked for accuracy or

monitored while in use (including timers, counters, and

shift registers) via the CRT display. Other VT14 features

are used during start-up operations. These capabilities

expedite control circuit design and system troubleshooting.

HOW THIS MANUAL IS ORGANIZED

The VT14 Users Manual provides complete instructions for

programming the 14 Controller. Refer to Chapter 1of the

Industrial 14 Systems Manual for adescription of the 14/30

and 14/35 Controllers. This manual is divided into four

chapters:

Chapter 1: GETTING ON THE AIR

Introduction to the VT14, its operation, and

capabilities.

Chapter 2: WRITING YOUR CONTROL PROGRAM

Detailed instructions for the design of con-

trol circuits for the Industrial 14/30 and

14/35 Controllers.

Chapter 3: ENTERING THE PROGRAM

Detailed instructions for loading the com-

plete control program into the controller's

memory from the VT14.

Chapter 4: ON-LINE USE OF THE VT14

Detailed instructions for using the VT14 to

assist during checkout and startup of anew

machine or for troubleshooting an installed

system.

Appendices: Appendices include installation and startup

procedures for the VT14; examples for

programming internal functions; and use of a

Teletype console with the VT14.

VII

CHAPTER 1

GETTING ON THE AIR

This chapter assumes that the VT14 is connected to the

Industrial 14 system. If not, refer to the installation

procedure in Appendix C.

The operation of the VT14 can be mastered quickly since

the function of the keys is clearly indicated and the display

instantly records your entries. Later chapters give the

details for taking full advantage of the VT14 and the

controller it programs; but before learning all these details,

let's first enter afew circuits on the VT14 to appreciate

what can be done with this device.

Figure 1-1 shows the VT14 with the major elements of the

front panel indicated.

The POWER ON/OFF switch turns the VT14 on and is lit

while the terminal is powered.

The MODE switch selects the operations that the VTM will

be allowed to perform. At this point, set it to the

PROGRAM position.

The PRESET or POSITION switches are numbered, thumb-

wheel switches used to preset timer or counter values or to

position the cursor on the screen during editing operations.

The I/O NUMBER switches are numbered, thumbwheel

switches used to enter contact numbers for inputs and

outputs.

PRESET OR POSITION

SWITCHES FUNCTION

SWITCHES

LIGHT

MODE

POWER SWITCH

ON/OFF

SWITCH

ELEMENT

I/O SWITCHES

NUMBER

SWITCHES

Figure 1-1 VT14 Programming Terminal

1-1

The FUNCTION keys are used to tell the VT14 what

functions you want to perform: DISPLAY, EDIT, STORE,

etc.

ENTERING ALARGER CIRCUIT

To enter alarger circuit —one with branches within

it —remember afew rules:

The ELEMENT keys are used to enter the control circuit

for each output.

Two Indicator Lights tell the status of aselected input or

output: Is it on, is it disabled?

LET'S ENTER ACIRCUIT

First, blank the screen by striking ERASE.

The circuit is entered left to right, top to

bottom. In other words, each horizontal path is

completed before the next path is started.

The output coil (-0-) is always the last

element in the first row.

To enter anormally-open contact for input 200 (Figure

1-2), dial 0200 into the I/O NUMBER switches and press

the —I I—symbol. (All inputs are assigned numbers

between and 777.) Notice that the screen immediately

displays this contact.

Also notice asmall dash on the screen to the right of the

contact you've just entered. This is the cursor, a position

indicator that always shows where the next element you

enter will be placed within the circuit.

To add the normally closed contact for input 201 in series

with the contact already on the screen, simply set the I/O

NUMBER switches to 0201 and press the -J.4^ symbol.

Since that is the total circuit for output 1000, you can

complete the circuit by setting the I/O NUMBER switches

to 1000 and pressing the red -Q— symbol. (Outputs are

numbered from 1000 to 1377.)

When one horizqntal line has been completed,

the next is started by pressing the next line

(I—>)symbol.

Branches may be used anywhere within the

circuit by positioning adown branch (T)

symbol to initiate the branch and an up branch

(^)symbol to connect the branch.

Branches must be aligned vertically. Use the

SPACE key to move an up branch over under

its down branch; or use the line (•—»)symbol

to continue abranch out so that the up branch

symbol lines up with the down branch.

Use as many as eight parallel paths, each with

up to 10 contacts, branches, or spaces.

Up to this point, any entry you have made is retained in the

VT14. When you are satisfied with the displayed circuit,

press the STORE key to record the circuit in the

controller's memory.

After you have entered afew circuits, you'll see that these

rules are really very simple. Try to enter the more complex

circuit shown in Figure 1-3.

200 201

HI ^O

Figure 1-2 ASimple Control Circuit

200 201 212 1225

HI i+-

401

HI-

Figure 1-3 AMore Complex Control Circuit

1-2

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