Rockwell Automation 1794-IP4-B User Manual

Installation Instructions

FLEX I/O 4 Channel Pulse Counter Module

Cat. No. 1794-IP4 Series B

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we use notes to make you aware of safety considerations.

WARNING

IMPORTANT

ATTENTION

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

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

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

• identify a hazard

• avoid a hazard

• recognize the consequence

Environment and Enclosure This equipment is intended for use in a Pollution Degree 2 industrial

environment, in overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes up to 2000 meters without derating.

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

This equipment is supplied as "open type" equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional infor mation regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

See NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosure. Also, see the appropriate sections in this publication, as well as the Allen-Bradley publication 1770-4.1 ("Industrial Automation Wiring and Grounding Guidelines"), for additional installation requirements pertaining to this equipment.

WARNING

ATTENTION

When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding. Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance that can affect module operation.

If you connect or disconnect wiring while the field-side power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc plated yellow-chromate steel DIN rail to assure proper grounding. The use of other DIN rail materials (e.g. aluminum, plastic, etc.) that can corrode, oxidize, or are poor conductors, can result in improper or inter mittent grounding.

Preventing Electrostatic Discharge This equipment is sensitive to electrostatic discharge, which can

cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component boards.

• Do not touch circuit components inside the equipment.

• If available, use a static-safe workstation.

North American Hazardous Location Approval

The following information applies when operating this equipment in hazardous locations:

Products marked “CL I, DIV 2, GP A, B, C, D” are suita ble for use in Clas s I Division 2 Groups A, B , C, D, Hazardous Locations and nonhazardous locations only. Each product is supplied with markings on the rating nameplate indicating the hazardous location temperature code. When combining products within a system, the mos t adverse temperatur e code (lowest “T” number) may be used to help determine the overall temperature code of the system. Combinations of equipment in your system are subject to investigation by the local Autho rity Having Jurisdictio n at the time of installation.

WARNING

EXPLOSION HAZARD

• Do not disc onnect equipment unles s power has been removed or the area is known to be no nhazardous.

• Do not disc onnect connections to this equipment unless power has been removed or the area is know n to be nonhazardous. Secure any external co nnections that mate to this equipment by using screws, slidin g latches, threaded conn ectors, or other means provided with this product.

• Substitu tion of components may impair suitability for Class I, Division 2.

• If this product contains batteries, they m ust only be changed in an area known to be nonhazardous.

Informations sur l’utilisation de cet équipement en environnements dangereux :

Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne conviennent qu’à un e utilisation en environnements de Classe I Divisio n 2 Groupes A, B, C, D dangereux et non dangereux. Ch aque produit est livré avec des marquages sur sa plaque d’id entification qui indiquent le code de température pour les environnements dangereux. Lorsque plusieurs prod uits sont combinés dans u n système, le code de tempé rature le plus défavorab le (code de température le plus faible) peut être utilisé pour déterminer le code de température global du système. Les combinaisons d’ équipements dans le s ystème sont sujettes à inspection par les autorités locales qua lifiées au moment de l’ installation.

AVERTISSEMENT

RISQUE D’EXPLOSION

• Couper le courant ou s’assurer que l’environnement est classé non dangereu x avant de débrancher l'équipement.

• Couper le courant ou s'assurer que l’environnement est classé non dangereu x avant de débrancher les connecteurs. Fixer tous les connecteurs externes reliés à cet éq uipement à l'aide de vis, loquets coulissants, connecteurs filetés ou autres moyens fourni s avec ce produit.

• La substitut ion de composants peut rendre cet équipement inadapté à un e utilisation en environnement de Classe I, Division 2.

• S’assurer que l’environnement est classé non dangereux avant de changer les piles.

Publication 1794-IN064D-EN-P - March 2005

Even Numbered I/O Terminals 0 thru 14

+ C

Installing Your Pulse Counter Module

The module mounts on a 1794 terminal base.

ATTENTION

1. Rotate the keyswitch (1) on the terminal base (2) clockwise to position 1 as required for this type of module.

2. Make certain the flexbus connector (3) is pushed all the way to the left to connect with the neighboring termbase/adapter. You cannot install the module unless the connector is fully extended.

3. Make sure the pins on the bottom of the module are straight so they will align properly with the connector in the terminal base.

WARNING

4. Position the module (4) with its alignment bar (5) aligned with the groove (6) on the terminal base.

5. Press firmly and evenly to seat the module in the terminal base unit. The module is seated when the latching mechanism (7) is locked into the module.

During mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage on power up.

If you remove or insert the module while the backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

Connecting Wiring for the 1794-IP4 (using a 1794-TB2, -TB3 or

-TB3S terminal base unit)

1. Connect individual input wiring (N, N) or (D, D) for each channel to

numbered terminals on the 0-15 row (A) as indicated in the table below.

5. If daisychaining power to the next terminal base, connect a jumper from terminal 51 (+V dc) on this base unit to terminal 34 on the next base unit.

6. If continuing dc common to the next base unit, connect a jumper from terminal 33 (common) on this base unit to terminal 16 on the next base unit.

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

-V

Common

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Voltage In +V

-V (Supply Common) = Terminals B16 and B33 +V (Supply +Voltage) = Terminals C34 and C51 (Use B33 and C51 for daisy-chaining to next terminal base unit.)

Inputs

Commons

Voltage

-V

Common

Voltage Out +V

(1794-TB3 shown)

Connecting Wiring for the 1794-IP4 (using a 1794-TBN terminal base unit)

1. Connect individual input wiring (N, N) or (D, D) for each channel to

the even-numbered terminals on the 16-33 row (B) as indicated in the table below.

2. Connect the associated input common to the corresponding odd-numbered terminal on the 34-51 row (C) for each input as

indicated in the table below.

ATTENTION

3. Connect +V dc power to terminal 34 on the 34-51 row (C).

4. Connect dc return to terminal 16 on the 16-33 row (B).

5. If daisychaining power to the next terminal base, connect a jumper

from terminal 51 (+V dc) on this base unit to terminal 34 on the next base unit.

6. If continuing dc common to the next base unit, connect a jumper from terminal 33 (common) on this base unit to terminal 16 on the next base unit.

Do not connect maximum input voltage simultaneously to all inputs if the module ambient temperature is expected to exceed 40°C.

If the ambient temperature is expected to continuously exceed 40°C, you must limit the input voltage using an external resistor on each input. A 1kW resistor effectively limits a 24V sensor signal to about 15V at the input. Do not limit the input to less than 6V.

2. Connect the associated input common to the corresponding terminal

on the 16-33 row (B) for each input as indicated in the table below.

ATTENTION

Do not connect maximum input voltage simultaneously to all inputs if the module ambient temperature is expected to exceed 40°C.

If the ambient temperature is expected to continuously exceed 40°C, you must limit the input voltage using an external resistor on each input. A 1kΩ resistor effectively limits a 24V sensor signal to about 15V at the input. Do not

COM

V = Terminals C34 and C51

OM (-V) = Terminals B16 and B33

6789101112

Odd Numbered I/O Terminals 1 thru 15

COM

limit the input to less than 6V.

3. Connect +V dc power to terminal 34 on the 34-51 row (C).

4. Connect dc return to terminal 16 on the 16-33 row (B).

Publication 1794-IN064D-EN-P - March 2005

Wiring Connections for the 1794-IP4

Channel Signal

Name

16-bit Period Time Measurement

0 N A-0 B-17 C-35 B-0

N A-1 B-18 C-36 B-1

1 N A-2 B-19 C-37 B-2

N A-3 B-20 C-38 B-3

2 N A-4 B-21 C-39 B-4

N A-5 B-22 C-40 B-5

3 N A-6 B-23 C-41 B-6

N A-7 B-24 C-42 B-7

32-bit Period Time Measurement

0 D A-8 B-25 C-43 B-8

D A-9 B-26 C-44 B-9

1 D A-10 B-27 C-45 B-10

D A-11 B-28 C-46 B-11

2 D A-12 B-29 C-47 B-12

D A-13 B-30 C-48 B-13

3 D A-14 B-31 C-49 B-14

D A-15 B-32 C-50 B-15

0V dc Terminals 16 thru 33 (1794--TB2, -TB3,

12/24V dc Terminals 34 and 51 (1794-TB2)

1 Any unused signals have t o be connected to the associated common. 2 Auxiliary terminal blocks are required when us ing these terminal base units.

1794-TB2, -TB3, -TB3S

Signal 0V dc

COM

12...24V dcSignal

-TB3S)

Terminals 34 thru 51 (1794-TB3, -TB3S)

Example of 16-bit Period Time Measurement and 16-bit Accumulating Pulse Counter Wiring (4 channels)

Accumulating Pulse Counter

Channel 3

Channel 2

Channel 1

Channel 0

1794-TBN

Terminals 16 and 33

Terminals 34 and 51

Example of 32-bit Period Time Measurement Wiring (4 channels)

32-bit period time measurement

Channel 3

Channel 2

Channel 1

Channel 0

Power Supply

NOTE: To reduce noise, attach N to 0V dc

Input (read) Image

Dec. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Oct. 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0

0 Reserved

1 Counter 00 - 16-bit period measurement for channel 0

2 Counter 01 - pulse counter for channel 0 - 16-bit pulse counting

1 32-bit period measurement for channel 0

2 32-bit period measurement for channel 0

3 Counter 10 - 16-bit period measurement for channel 1

4 Counter 11 - pulse counter for channel 1 - 16-bit pulse counting

3 32-bit period measurement for channel 1

4 32-bit period measurement for channel 1

5 Counter 20 - 16-bit period measurement for channel 2

6 Counter 21 - pulse counter for channel 2 - 16-bit pulse counting

5 32-bit period measurement for channel 2

6 32-bit period measurement for channel 2

7 Counter 30 - 16-bit period measurement for channel 3

8 Counter 31 - pulse counter for channel 3 - 16-bit pulse counting

7 32-bit period measurement for channel 3

8 32-bit period measurement for channel 3

9 Readback of Co ntrol Word 2

10 Revidion Read - software version code

Where M = Measurement Ready bit - positive edge measurement ready for the respective channel

Output/Configuration Image

11 12 13

Signal Inputs

External

0V dc

12/24V dc

Reserved R

RD = Reset done

8 9 10 11 12 13 14 15

24 25 26 27 28 29 30 31 32

42 43 44 45 46 47 48 49 50

14 15

R D 1

M3M2M1M D 0

012345678

Signal Inputs

17 18 19 20 21 22 23 24 25 33

0V dc

12/24V dc

35 36 37 38 39 40 41 42

External

Power Supply

12/24V dc

NOTE: To reduce noise, attach N to 0V dc

Dec. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Oct. 17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0

673452

0 Control Word 0 - selects the measur e function

1 Control Word 1 - sets the clock freq uency and period multiple

2 Control Word 2 - sets the start of a new measurement

3 Not used

Publication 1794-IN064D-EN-P - March 2005

Description of Control Word 0

Bit Description

Bit 0 Pulse Counting and period time measurement selection for Channel 0

0 = pulse counting and period time measurement selected - 16-bit 1 = period time measurement selected - 32-bit

Bit 01 Pulse Counting and period time measurement selection for Channel 1

0 = pulse counting and period time measurement selected - 16-bit 1 = period time measurement selected- 32-bit

Bit 02 Pulse Counting and period time measurement selection for Channel 2

0 = pulse counting and period time measurement selected - 16-bit 1 = period time measurement selected- 32-bit

Bit 03 Pulse Counting and period time measurement selection for Channel 3

0 = pulse counting and period time measurement selected - 16-bit 1 = period time measurement selected- 32-bit

Bit 04

Channel 0 - 0 = filter disabled; 1 = filter enabled

Bit 05

Channel 1 - 0 = filter disabled; 1 = filter enabled

Bit 06

Channel 2 - 0 = filter disabled; 1 = filter enabled

Bit 07

Channel 3 - 0 = filter disabled; 1 = filter enabled

Bits

09 08 Filter sample clock frequency and period (common to all

08-09

0 0 625kHz 1.6µs 0 1 312.5kHz 3.2µs 1 0 104.17kHz 9.6µs 1 1 7.8125kHz 128µs

Bits

Reserved

10-15

Use filter when the input waveform has slow rise/fall time or has high frequency noise on the input waveform.

channels)

Filter Function Description

Use the filter in either 16-bit or 32-bit mode. Enable filter to use a triangular shape waveform of frequencies as low as 1Hz. If the filter is not enabled, the module will only function properly with input waveform of square shape.

Description of Control Word 2

Bit Description

00 Start new measurement - Channel 0 - when set, start new

measurement on positive edge

01 Start new measurement - Channel 1 - when set, start new

measurement on positive edge

02 Start new measurement - Channel 2 - when set, start new

measurement on positive edge

03 Start new measurement - Channel 3 - when set, start new

measurement on positive edge

04 Reset Counter, Channel 0 - a positive edge on this bit resets counter 01 05 Reset Counter, Channel 01- a positive edge on this bit resets counter 11 06 Reset Counter, Channel 2 - a positive edge on this bit resets counter 21 07 Reset Counter, Channel 3 - a positive edge on this bit resets counter 31 08-15 Reserved for factory use

Description of Control Word 2 Readback

Bit Description

00 Positive edge - Channel 0 - measurement ready 01 Positive edge - Channel 1 - measurement ready 02 Positive edge - Channel 2 - measurement ready 03 Positive edge - Channel 3 - measurement ready 04 Reset Counter, Channel 0 - a positive edge on this bit indicates counter 01

reset done

05 Reset Counter, Channel 1 - a positive edge on this bit indicates counter 11

reset done

06 Reset Counter, Channel 2 - a positive edge on this bit indicates counter 21

reset done

07 Reset Counter, Channel 3 - a positive edge on this bit indicates counter 31

reset done

08-15 Reserved for factory use

ATTENTION

Do not enable the filter with frequencies greater than 90kHz. A loss of counts may result.

Description of Control Word 1

Bit Description

Clock Frequency for period time measurement - Channel 0

0 = period time measurement with 10MHz internal clock selected 1 = period time measurement with 1MHz internal clock selected

01-03

03 02 01 Number of periods for measurement - Channel 0

0 0 0 1 period 0 0 1 2 period 0 1 0 4 period 0 1 1 8 period 1 0 0 16 period 1 0 1 32 period 1 1 0 64 period 1 1 1 128 period

Clock frequency for period time measurement - Channel 1 - refer to bit 00

05-07

Selection of number of periods for measurement - Channel 1 - see bits 01-03

Clock frequency for period time measurement - Channel 2 - refer to bit 00

09-11

Selection of number of periods for measurement - Channel 2 - see bits 01-03

Clock frequency for period time measurement - Channel 3 - refer to bit 00

13-15

Selection of number of periods for measurement - Channel 3 - see bits 01-03

Publication 1794-IN064D-EN-P - March 2005

Specifications

Specifications Pulse Counter Module, Cat. No. 1794-IP4

Number of Inputs 4

Module Location Cat. No. 1794-TB2, -TB3, -TB3S, -TBN

Dimensions (with module installed in base)

Imperial Metric

Counting Frequency 100kHz maximum - Each signal condi tion must be stable fo r at least

Input Range Input ON

Input OFF

Input Current (typical) 3mA @ 6V dc

Data Format Period read in 1µs counts with 1 MHz internal clock selected;

Overflow Maximum period is 65 ms when 1 MHz internal clock selected;

Isolation Voltage Tested at 600V ac for 1s

Flexbus Current 5mA at 5V dc

Power Supply (external) 12...24V dc (+10%)

Current Consumption from external power supply

Power Dissipation 5W maximum @ 26.4V dc

Thermal Dissipation 17.1 BTU/hr (maximum) @ 26.4V dc

Indicators (field side indication, custom er device driven)

Keyswitch Position 1

Environmental Conditions

Operating Temperature

Storage Temperature IEC 60068-2-1 (Test Ab, Unpackaged Nonoperating Cold),

Relative Humidity IEC 60068-2-30 (Test Db, Unpackaged Nonoperating

Vibration IEC60068-2-6 (Test Fc, Operating):

Shock IEC60068-2-27 (Test Ea, Unpackaged shock):

Emissions CISPR 11:

ESD Immunity IEC 61000-4-2:

Radiated RF Immunity IEC 61000-4-3:

EFT/B Immunity IEC 61000-4-4:

Surge Transient Immunity

Conducted RF Immunity

Enclosure Type Rating None (open -style)

Conductors Wire

Length (maximum)

Rockwell Automation 1794-IP4-B User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual