Installation Instr uctions
Multi-Channel High-Speed
Counter
1746-HSCE2
Inside
For More Information..................................................................2
Compliance to European Union Direct ives............................. ....3
Hazardous Location Considerations............................................4
Environnements dangere ux................................ .... ......................4
Hardware Features.......................................................................5
LEDs............................................................................................6
Prevent Electrostatic Discharge................................ .... .... ...........6
Setting the Jumpers......................................................................7
Installing the Module................ ... .... ......................... .... .... ...........8
Important Wiring Considerations.................................................9
Removing the Terminal Block...................................................10
Input and Output Connections................ .... .... ......................... ..10
Encoder Wiring..........................................................................10
Electronic Protection......... .... .... ......................... .... ....................14
Specifications............................ ... .... ......................... .... .... .........16
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2 Multi-Channel High-Speed Counter
For More Information
As part of our effort to preserve, protect, and improve our environment,
Allen-Bradley is reducing the amount of paper we use. Less paper means more
options for you. In addition to traditional p rinted publications and CD-ROM
versions, we now offer on-line materials with the most up-to-date information
you can get. We recommend that you read the related publications listed below
before starting up your control system.
Related Publications
For Refer to this Document Pub. No.
A more detailed description on how to
install, configur e, and operate your
multi-channel high speed counter.
A detailed description on how to install
and use your modular SLC 500™ system
A reference manual that contains status
file data and instruction set information
for SLC 500 processors.
Multi-channel High Speed
Counter User Manual
SLC 500 Modular Hardware
Style Installation and
Operation Manual
SLC 500™ and
MicroLogix™ 1000
Instruction Set Reference
Manual
1746-6.20
1747-6.2
1747-6.15
How to Get More Informatio n
If you would like a manual, you can:
• download a free electronic version from the internet at
www.theautomationbookstore.com
• purchase a printed manual by:
– contacting your local distributor or Rockwell Auto mation representative
– visiting www.theautomationbookstore.com and placing your order
– calling 1.800.963.9548 (USA/Canada) or
001.330.725.1574 (Outside USA/Canada)
Publication 1746 -IN002A-US-P
Multi-Channel High-Speed Counter 3
Compliance to European Union Directives
If this product has the CE mark, it is approved for installation within the
European Union and EEA regions. It has been designed and tested to meet the
following directives.
EMC Directive
This product is tested to meet Council Directive 89/336/EEC Electromagnetic
Compatibility (EMC) and the following standard s, in whole or in part,
documented in a technical construction file:
• EN 50081-2
EMC – Generic Emission Standard, Part 2 – Industrial Environment
• EN 50082-2
EMC – Generic Immunity Standard, Part 2 – Industrial Environment
This product is intended for use in an industrial environment.
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC Low Voltage, by
applying the safety requ ir ements of EN 61131-2 Pr ogrammable Controllers, Pa rt
2 – Equipment Requirements and Tests.
For specific information required by EN61131-2, see the appropriate sections in
this publication, as well as the following Allen-Bradley publications:
• Industrial Automation, Wiring and Grounding Guidelines for Noise Immunity ,
publication 1770-4.1
• Automation Systems Catalog, publication B111
Publication 1746-I N002A-US-P
4 Multi-Channel High-Speed Counter
!
WARNING
!
MISE EN
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D, or
non-hazardous locations only. The following ATTENTION statement applies to
use in hazardous locations.
EXPLOSION HAZARD
• Substitution of components may impair suitability for
Class I, Division 2.
• Do not replace components or disconnect equipment unless
power has been switched off, and the area is known to be
non-hazardous.
• Do not connect or disconnect connectors or operate
switches while circuit is live unless the area is known to be
non-hazardous.
• All wiring must comply with N.E.C. article 501-4(b).
Environnements dangereux
Cet équipement est conçu pour être utilisé dans des environnemen ts de Classe 1,
Division 2, Groupes A, B, C, D, ou non dangereux. La mise en garde suivante
s’applique à une utilisation dans des environnements dangereux.
DANGER D’EXPLOSION
• La substitution de composants peut rendre cet équipement
impropre à une utilisation en environnement de Classe 1,
Division 2.
• Couper le courant ou s’assurer que l’emplacement est
désigné non dangereux avant de remplacer les composants.
• Couper l’alimentation ou s’assurer que l’environnement est
classé non dangereux avant de brancher ou débrancher des
connecteurs ou de faire fonctionner des commutateurs.
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Multi-Channel High-Speed Counter 5
Hardware Features
The module’s hardware features are illustrated below.
COUNTER
Input Status LEDs
Input and Output
Terminals
OUTPUT STATUS
1023
A1 B1 Z1
A2 B2 Z2
INPUT STATUS
HSCE2
Output Status LEDs
Running Status LED
RUN
FLT
Fault Status LED
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!
ATTENTION
LEDs
The front panel has a total of twelve indicator LEDs.
LED Color Indicates
0 OUT Green ON/OFF status of real output
1 OUT Green ON/OFF status of real output
2 OUT Green ON/OFF status of real output
3 OUT Green ON/OFF status of real output
RUN Green Running status of the modu le
FLT Red Steady on: Module fault
A1 Yellow ON/OFF status of input A1
A2 Yellow ON/OFF status of input A2
B1 Yellow ON/OFF status of input B1
B2 Yellow ON/OFF status of input B2
Z1 Yellow ON/OFF status of input Z1
Z2 Yellow ON/OFF status of input Z2
Flashing: Output overcurrent
Prevent Electrostatic Discharge
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Static discharges may cause permanent damage to the
module. Follow these guidelines when you ha ndle the
module:
• Touch a grounded object to discharge static potential.
• Wear an approved wrist strap grounding device.
• Handle module by plastic case only. Avoid contact
between module circuits and any surface which can
hold an electrostatic charge.
• If available, use a static-safe work station.
Multi-Channel High-Speed Counter 7
IMPORTANT
!
ATTENTION
Setting the Jumpers
Six jumpers are located in a row on the side of the module. Use the jumpers to
select the input voltage for each of the inputs A1, B1, Z1, A2, B2, and Z2. The
settings are shown in the figure below.
Jumper Se ttings
JP1 (A1 )
JP2 (B1)
JP3 (Z1)
JP4 (A2)
JP5 (B2)
JP6 (Z2)
5V dc
4.2-12V dc
24V dc
10-30V dc
(default)
For a 12V dc encoder signal, use the 24V dc jumper setting.
If jumpers are not set to match the encoder type, the module
may be damaged.
The 5V dc settings respond to inputs with a active or high settings between 4.2
and 12 volts. The 24V dc settings respond to inputs with active or high settings
between 10 and 30 volts.
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8 Multi-Channel High-Speed Counter
!
ATTENTION
Installing the Module
Disconnect power before attempting to install, remove, o r
wire the module.
1. Make sure your SLC p ower supply has adequate reserve current capaci ty. The
module requires 250 mA at +5V dc.
2. Align the full-sized circuit board with the chassis card guide as shown below.
The first slot of the first chassis is reserved for the processor.
3. Slide the module into the chassis until the top and bottom latches catch. To
remove the module, press the release clips at the top and bo ttom of the mod ule
and slide it out.
4. Cover all unus ed card slots with the C a rd Sl o t Fill er, catalog nu mber 1746-N2.
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Multi-Channel High-Speed Counter 9
Important Wiring Considerations
Use the following guidelines when planning the system wiring for the module:
• Install the SLC 500 system in a NEMA-rated enclosure.
• Disconnect power to the SLC processor and the module before wiring.
• Make sure the system is properly grounded.
• Group this module and low-voltage DC modules away from AC I/O or
high-voltage D C modules.
• Shielded cable is required for high-speed input signals A, B, and Z. Use
individually shielded, twisted pair cable lengths up to 300 m (1000 ft.).
• Shields should be grounded only at one end. Ground the shield wire outside
the module at the chassis mounting screw. Connect the shield at the encoder
end only if the housing is isolated from the motor and ground.
• If you have a junction in the cable, treat the shields as a conductor at all
junctions. Do not ground them to the junction box.
Considerations for Reducing Noise
In high noise environments, the 1746-HSCE2 inputs may accept “false” pulses,
particularly when using low frequency input signals with slowly sloping pulse
edges. To minimize the ef fects of hi gh fr equency no ise on low fr equency s ignals,
the user can do the following:
• Identify and re move noise sources.
• Route 1746-HSCE2 input cabling away from noise sources.
• Install low pass filters on input signals. Filter values are dep endent on the
application and can be determined empirically.
• Use devices which output differential signals, like differential encoders, to
minimize the possibility that a noise source will cause a false input.
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10 Multi-Channel High-Speed Counter
!
ATTENTION
Removing the Terminal Block
Remove the terminal block by turning the slotted term inal block release screws
counterclockwise. The screws are attached to the terminal block, so the block
will follow as the screws are turned out.
To avoid cracking the removable terminal block, alternate
removal of the slotted terminal block release screws.
Input and Output Connections
Input and output wiring terminals are shown in the figure below. Each terminal
accepts two #14 A WG wires. T ighten screws only tight enoug h to immobilize the
wire. The torque applied to the screw should not exceed 0.9 Nm (8 in-lb).
Encoder Wiring
Differential encoders provide the best immunity to electrical noise. We
recommend, whenever possible, to use differential encoders.
The wiring diagrams on the following pages are provided to support the
Allen-Bradley encoders you may already own.
OUTPUT COMMON
OUTPUT 1
OUTPUT 3
Release Screw
A1+
B1+
Z1+
A2+
B2+
Z2+
Release Screw
A1-
B1-
Z1-
A2B2Z2-
OUTPUT 0
OUTPUT 2
+Vdc
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Differential Encoder Wiring
Cable
VS
GND
Multi-Channel High-Speed Counter 11
(1)
+VDC
COM
Power
Suppl
A(+)
A(–)
B(+)
B(–)
Z(+)
Z(–)
Allen-Bradley
845H Series
differential
encoder
A
A
B
B
Z
Z
Shield
shield/housing
Connect only if housing is electronically
isolated from the motor and ground.
Earth
Module Inputs
(1) Refer to your encoder ma nual for proper cable type. The type of c able used should be twisted
pair, individually shielded cabl e wit h a maximum length of 300m (1000 ft .).
Differential Encoder Output Waveforms
The figure below shows the di fferent encoder output waveforms. If your encoder
matches these waveforms, the encoder signals can be directly connected to the
associated screw terminals on the module. For example, the A lead from the
encoder is connected to the module’s A+ screw. If your encoder does not match
these waveforms, some wiring modifications may be necessary. See the user’s
manual for your encoder.
A
A
B
B
Z
Z
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12 Multi-Channel High-Speed Counter
R
Single-Ended Encoder Wiring (Open Collector)
(1)
cable
Allen-Bradley
845H Series
VS
GND
(2)
R
A
B
Z
single-ended
encoder
shield
shield/housing
Connect only if housing is electronically
isolated from the motor and ground.
(1) Refer to your encoder ma nual for proper cable type. The type of c able used should be twisted
pair, individually shielded cabl e wit h a maximum length of 300m (1000 ft .).
(2) External resistors are needed if not internal to the encoder. The pull-up resist or (R) value
depends on the power supply value. The table below shows resistor values for typical supply
voltages. To calculate the resistor value, use one of the following formulas:
–()
Vcc Vmin
R
For 5V dc jumper position:
For 24V dc jumper position:
----------------------------------=
Imin
–()
Vcc Vmin
---------------------------------- 1 K
=
Imin
Ω–
where:R = pull-up resistor value
Vcc = power supply voltage
Vmin = 4.2 V dc
Imin = 6.3 mA
Earth
+VDC
COM
A(+)
A(–)
B(+)
B(–)
Z(+)
Z(–)
Power
Supply
Module Inputs
Power Supply Voltage (Vcc)
Pull-up Resistor Value (R)
(1)
5V dc 127 Ω
12V dc 238 Ω
24V dc 2140 Ω
(1) Resistance values may change, depending upon your ap plication.
Single-Ended Encoder Output Waveforms
The figure below shows the single-ended encoder output waveforms. When the
waveform is low , t he encoder outp ut transist or is on. When t he waveform is high,
the encoder output transistor is off.
A
B
Z
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Multi-Channel High-Speed Counter 13
R
Vcc Vmin
–()
Imin
------------------------------------=
Vcc Vmin
–()
Imin
------------------------------------ 1KΩ–
=
Single-Ended Wiring (Discrete Devices)
+VDC
proximity sensor
VS
OUT
COM
VS
OUT
COM
VS
OUT
COM
solid-state
switch
(1)
R
photoelectric sensor
with open collector
sinking output
(1) External resistors are needed if not internal to the sensor. Check your sensor’s documentation.
The pull-up resistor (R) val ue dep en ds on the power supply value. The table below sho ws
resistor values for ty pi cal supply voltages. To calculate the resistor va lue, use one of the
following formulas:
COM
A(+)
A(–)
B(+)
B(–)
Z(+)
Z(–)
Power
Supply
Module Inputs
For 5V dc:
For 24V dc:
where:R = pull-up resistor value
Vcc = power supply voltage
Vmin = 4.2 V dc
Imin = 6.3 mA
Power Supply Voltage (Vcc)
5V dc 127 Ω
12V dc 238 Ω
24V dc 2140 Ω
(1) Resistance values may change, depending upon your ap plication.
Pull-up Resistor Value (R)
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(1)
14 Multi-Channel High-Speed Counter
IMPORTANT
IMPORTANT
Electronic Protection
The electronic protection of the 1746-HSCE2 has been designed to provide
protection for the module from short-circuit and overload curr ent conditions. The
protection is base d on a th ermal cut-ou t princi ple. In the event of a short circuit or
overload current condition on an output channel, all channels turn off within
milliseconds after the thermal cut-out temperature has been reached.
The module does not provide protection against reverse
polarity wiring or wiring to AC power sources. Electronic
protection is not intended to replace fuses, circuit breakers, or
other code-required wiring protection devices.
Auto Reset Operation
1746-HSCE2 outputs perform auto-reset under overload
conditions. When an output channel overload occurs as
described above, all channels turn off within milliseconds
after the thermal cut-out temperature has been reached. While
the overcurrent condition is present, the module tries resetting
the outputs at intervals of 500 ms. If the fuse cools below the
thermal cut-out temperature, all outputs will auto-reset and
resume control of their external loads as directed by the
module until the thermal cut-out temperature is again reached.
Publication 1746 -IN002A-US-P
Removing power from an overloaded output channel would
also allow the fuse to cool below the thermal cut-out
temperature, allowing auto-reset to occur when power is
restored. The output channel then operates as directed by the
module until the thermal cut-out temperature is again reached.
To avoid auto-reset of output channels under overload
conditions, monitor the fuse blow n status bit (FB1) in the
module’s status file and latch the output off when an
overcurrent condition occurs. An external mechanical fuse
can also be used to open an output circuit when it is
overloaded.
Multi-Channel High-Speed Counter 15
Short-Circuit/Overload Current Diagnostics
If a short-circuit or overload current condition occurs on an output channel:
1. The FLT LED flashes, provided that power is applied to the module. 5V dc via
backplane and load power via an external supply is required.
2. Fuse status bit (FB1) is set (1) when the fuse is tripped. The module tries to
reset the outputs at intervals of 500 ms. During each retry, the fuse status bit is
reset (0). After the overload condition is corrected, the fuse status bit resets (0)
automatically.
When FB1 is set, outputs 0 thro ugh 4 will not function.
3. All output channels will be turned off in the case of a short-circuit or overload
condition.
Recovery fro m Channel Shutdo wn
1. Remove the SLC 500 system power and correct the conditions causing the
short-circuit or overload current condition.
2. Restore the SLC 500 system power. The module automatically resets and
resumes control of the output channel and associated load.
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16 Multi-Channel High-Speed Counter
Specifications
General
Operating Temperature 0°C to +60°C (+32°F to +140°F)
Storage Temperature -40°C to +85°C (-40°F to 185°F)
Humidity 5 to 95% without condensation
Backplane Current Consumption
(power supply loading)
Backplane Isolation 1000V dc
Maximum Cable Length 300m (1000 ft.)
Agency Certification UL listed
250 mA at +5V dc
0 mA at +24V dc
C-UL listed
Class I, Division 2, Groups A, B, C, and D
CE certified for all applicable directives
(when product or packaging is marked)
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Multi-Channel High-Speed Counter 17
Inputs A, B, and Z
Jumper Setting 5V dc 24V dc
Nominal Input Voltage 5V dc 24V dc
Input Voltage Range 4.2V dc to 12V dc 10V dc to 30V dc
On-State Voltage (min.) 4.2V 10V
Off-St ate Voltage (max.) 0.8V 3V
Maximum Off-state Leakage
Current
Input Current (max.) 8 mA 20 mA
Input Current (min.) 6.3 mA 6.3 mA
Nominal Input Impedance 500 Ω 1500 Ω
Min. Pulse Width 475 ns 475 ns
Min. Phase Separation 200 ns 200 ns
Max. Input Freq uency 1 MHz 1 MHz
Isolation (from backplane) 1000V 1000V
Isolation (from outputs) 500V 500V
100 µA 100 µA
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18 Multi-Channel High-Speed Counter
!
ATTENTION
Outputs (sourcing)
Max. On-State Output Current (per
channel)
Max On-State Current (per module) 2.0 A at 40°C
Max. On-State Voltage Drop 0.5V
Max. Off-State Leakage Current 100 µA
Isolation (from backplane) 1000V
Isolation (from inputs) 500V
A transient pulse occurs in transistor outputs when the
external dc supply voltage is applied to the output common
terminals (for example, via the master control relay). This can
occur regardless of the processor having power or not. For
most applications, the energy of this pulse is not sufficient to
energize the load. Refer to the SLC 500 Modular Hardware
Style Installation and Operation Manual, publication
1747-6.2, for more information on transient pulses and
guidelines to reduce inadvertent processor operation.
1.0 A at 40°C
1.0 A at 60°C
1.5 A at 60°C
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Multi-Channel High-Speed Counter 19
Publication 1746-I N002A-US-P
Publication 1746-IN002A-US-P - February 2000 PN 40071- 078-01 (A)
Supersedes Publication 1746-5.21 - March 1999 © 2000 Rockwell International Corporation. Printed in the U.S.A.
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