Siemens High Speed Counter and Encoder Module SIMATIC 505 User Manual

SIMA

TIC 505

High Speed Counter and Encoder Module

User

Manual

Order Number: PPX:505–81 Manual Assembly Number: 2586546–0019 Second Edition

13–2

Copyright

1992 by Siemens Industrial Automation, Inc.

Reproduction, contents is not permitted without express consent of Siemens Industrial created by patent grant or registration of a utility model or design, are reserved.

Since Siemens Industrial Automation, Inc. does not possess full access to data concerning all of the uses and applications of customer’s products, we do not assume responsibility either for customer product design or for any infringements of patents or rights of others which may result from our assistance.

01/21/92

transmission or use of this document or

Automation, Inc. All rights, including rights

T

echnical data is subject to change.

W

e check the contents of every manual for accuracy at the time it is approved for printing; however undetected errors. Any errors found will be corrected in subsequent editions. Any suggestions for improvement are welcomed.

, there may be

Overview

1.1 Features 1-2.

1.2 Inputs 1-4

1.3 Outputs 1-5

1.4 LED Indicators 1-6.

1.5 Counting Modes 1-7.

1.5.1 Pulse-Counter Mode 1-7.

1.5.2 Quadrature Mode Overview 1-8.

1.5.3 1X Quadrature 1-8.

1.5.4 2X Quadrature 1-9.

1.5.5 4X Quadrature 1-10.

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

Series

505 High Speed Counter

and Encoder Module User

’

s Manual

Overview

1-1

1.1 Features

The

Series 505 High Speed Counter (HSC) module (PPX:505-7002)

provides two independent high-speed counter channels.

Each channel has the following features.



Four counter modes:



Pulse counter



Quadrature counter modes: 1X, 2X, 4X



A 10 kHz count rate with a minimum pulse width of 25



Four inputs:



two count inputs

s.

 reset  inhibit

 T

wo field outputs, each controlled by a separate programmable preset.



LED indicators display the status of the A and B count inputs, and of Y1 and Y2 outputs.

!

 The

All inputs may be sinking or sourcing (with external 24 VDC power supply).

The HSC module operates asynchronously from the controller scan. Y

ou can program the controller to monitor the HSC and/or to provide high-level control of the HSC’

s operation. T

o support these functions, the HSC provides reset, inhibit, output and counter status to the controller and accepts reset and inhibit commands, and preset values from the controller

HSC module controls its four outputs. If the controller switches from the Run mode to the Program mode, the HSC continues to function as programmed, and outputs may be activated by the HSC. This means that if you switch the controller to Program mode, any devices controlled by the four outputs of the HSC will continue to operate as programmed.

.

1-2



Series

and Encoder Module User

505 High Speed Counter

’

s Manual

Bezel Screw

LEDs

Base Plane Connector

Terminal

Block

Printed Circuit Board

Front Bezel

Bezel Screw



Series 505 High Speed Counter

and Encoder Module User

’

s Manual

Figure 1-1

High

Speed Counter Module

Overview

1-3

1.2 Inputs

The

HSC module has two independent channels. Each channel has four

inputs.



Reset



Inhibit

 T

wo counter inputs

Each input may be used as either sinking or sourcing (with external 5–24 VDC power supply). The input signals are connected to the field wiring terminal block on the front bezel.

Counter Inputsą

Each channel has two counter inputs — Input A and

Input B.

Reset

Current flow through the reset input sets the channel’

s counter to zero. The counter will be held at zero until the reset input becomes inactive.

Inhibitą

Current flow through the inhibit input inhibits the channel from counting. The counter holds at the last value and does not change until the inhibit input becomes inactive.

NOTE:

When in the pulse counter mode, if the A or B input is in a different state at the beginning and end of an inhibit signal, the count will change according to the normal counting logic. If both A and B inputs are in different states, the change may be as much as two counts.

NOTE:

There are also software reset and inhibit functions. See Section 3.

1-4



Series

and Encoder Module User

505 High Speed Counter

’

s Manual

1.3 Outputs

Each

channel has two open collector outputs capable of driving TTL level signals or sinking up to 0.4 Amps of current (at 40_C) from an external 24 VDC source and load.

Y

Output

Output Return

Output Circuit

Y2

Y1

0 P1 P2 65,535

Counter V

Figure 1-2

The

output transistor (Y1 or Y2) turns on when the count is greater than or

alue

Output

equal to the corresponding preset. Figure 1-2 shows the field output operation. Y

ou can invert this operation by setting the appropriate bits in

the setup word, WY4. See Section 4.1.



Series

505 High Speed Counter

and Encoder Module User

’

s Manual

Overview

1-5

1.4 LED Indicators

Each indication of the channel’

channel contains four LED indicators which provide a visual

s status as shown in Figure 1-3.

1-6



Figure 1-3

A Turns B T Y1 T Y2 T

NOTE:ă

on when there is current flow through the A input. urns on when there is current flow through the B input. urns on when Output 1 is on. urns on when Output 2 is on.

If Reset or Inhibit is turned on, the HSC does not count, and the A

and B LEDs are frozen.

High

Speed Counter LEDs

and Encoder Module User

Series

505 High Speed Counter

’

s Manual

1.5 Counting Modes

1.5.1 Pulse Mode

Counter

Each channel has two inputs, A and B. In the pulse counter mode, counting occurs on the rising or falling edge of the incoming pulses. The relationship of the states of these two inputs determines the direction of the count. See T

able 1-1. T

incremental encoders.

T

able 1-1

Counter

Direction

ypical devices for counting are high-speed static switches or

Deter

mining Count in Pulse Counter Mode

Edge A

Input

B Input

up

up down down

In

the pulse counter mode, the channel senses the edges

input to count up or down. See Figure 1-4. T

”

#

”

#

low

high

o reliably record this transition

from low to high, the pulse width must be at least 8

Pulse Counter Mode

Count Value

Count Input Input A

Input B

1

8 s

min

2 3 2 1

11 s

min

high

low

of the A or the B

s.



Series

505 High Speed Counter

and Encoder Module User

’

s Manual

Count Up

Figure 1-4

Pulse

Counter Mode 0

Count Down

Overview

1-7

Counting Modes (continued)

1.5.2 Quadrature

Mode



1.5.3 1X Quadratur

e

For quadrature mode, each channel counts according to rising and/or falling edges. T Different quadrature modes are selected based on the resolution required by the application and the encoder used.

The module counts on the edges of the A input pulses.



When input A leads input B, the HSC counts up on each rising edge of input A.



When input B leads input A, the HSC counts down on the falling edge of input A.

Figure 1-5 illustrates the relationship between inputs A and B and the count value in

1X Quadrature

ypical devices for quadrature inputs are optical encoders.

1X Quadrature mode.

Count Value

A

B

12 10

26.7 s

25 s min

Count Up

(A Leading)

Figure 1-5

min

1X

Quadrature Mode

Count Down

(B Leading)

1-8

Overview

Series

and Encoder Module User

505 High Speed Counter

’

s Manual

1.5.4 Quadratur

2X

e

If input A leads input B, the module counts up on both the rising and falling edges of input A. If input B leads input A, the module counts down on the rising and falling edges of input A.

Figure 1-6 illustrates the relationship between inputs A and B and the count value in the 2X quadrature mode.

2X Quadrature

Count V

A

B

alue

1234 3210

25 s min

Counts Up

(A Leading)

Figure 1-6

26.7 s min

2X

Quadrature Mode

Counts Down

(B Leading)



Series

505 High Speed Counter

and Encoder Module User

’

s Manual

Overview

1-9

Counting Modes (continued)

1.5.5 Quadratur

4X

e

If input A leads input B, the module counts up on rising and falling edges of both input A and input B. If input B leads input A, the module counts down on the rising and falling edges of input A and input B.

Figure 1-7 shows the relationship between inputs A and B and the count value in the 4X

4X Quadrature

quadrature mode.

Count V

A

B

alue

12 34 5 6 7 8 7 65 4 32 10

25 s min

Counts Up

(A Leading)

Figure 1-7

26.7 s min

4X

Quadrature Mode

Counts Down

(B Leading)

1-10

Overview

Series

and Encoder Module User

505 High Speed Counter

’

s Manual

Siemens High Speed Counter and Encoder Module SIMATIC 505 User Manual

Contents

Overview

1.1 Features

1.2 Inputs

1.3 Outputs

1.4 LED Indicators

1.5 Counting Modes

Pulse Counter Mode

1X Quadrature

Quadrature Mode

2X Quadrature

4X Quadrature