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Rockwell Automation 842E-CM EtherNet/IP Encoders Installation Instructions User Manual

Features, Typical applications, Specifications

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Publication 10000481742 Ver 01
March 2013

Installation Instructions

842E-CM Integrated Motion on EtherNet/IP™

EtherNet/IP Absolute Encoder (with 1588 Precision Clock Synchronization)

IMPORTANT: SAVE THESE INSTRUCTIONS FOR FUTURE USE.

Description

The 842E-CM is an ultra-high resolution encoder with EtherNet/IP
interface with time synchronization for motion control. These
encoders provide 18-bit single-turn resolution and 30-bit multi-
turn resolution. The EtherNet/IP encoder is targeted for high
performance and reliability in harsh industrial environments.
Encoder includes an embedded EtherNet/IP switch to connect
additional E/IP capable product in series and/or support a Device
Level Ring (DLR) for Ethernet media redundancy.

Features

• EtherNet/IP with IEEE 1588 Precision Clock Synchronization
• Embedded switch
• Hardware/software IP address setting
• Resolution up to 30 bits
• Protection class up to IP67
• Simple and fast set up
• Device Level Ring (DLR)
• Solid and blind hollow shaft options

Typical Applications

• Packing machines
• Robotics
• Printing machines
• Motion Control on EtherNet/IP

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Specifications

Certifications

CE Marked for all applicable directives
NRTL mark (cTUVus) for UL 508
CAN/CSA C22.2.14-10

Electrical

Bus Connection

EtherNet/IP IEC 61784-1

CIP Sync

IEEE 1588 (IEC 61588, precision clock synchronization)

Transmission Rate

10/100 MBit/s

Transmission Medium

Cat-5e cable

Code Type

Binary

Operating Voltage Range

10…30V

Power Consumption

3.0 W

Resolution

262,144 (18 bit)

No. of Revolutions, max.

4,096 (12 bit)

Error Limits

±0.03°

Repeatability

±0.002°

Operating Current, max., no load;
10…30V supply

200 mA

Mechanical

Moment of Inertia

6.2 gcm

2

(solid shaft) of the rotor

35 gcm

2

(blind hollow shaft) of the rotor

Operating Speed

9,000 RPM (solid shaft), max.
6,000 RPM (blind hollow shaft), max.

Shaft Loading

Radial: 80 N max. (solid shaft)
Axial: 40 N max. (solid shaft)

Permissible Shaft Movement

Radial (static/dynamic): ± 0.3 / ± 0.05 mm [of drive element
(blind hollow shaft)]
Axial (static/dynamic): ± 0.5 / ± 0.1 mm [of drive element
(blind hollow shaft)]

Bearing Lifetime

3 x 10

9

revolutions

Angular Acceleration

5 x 10

5

rad/s², max.

Operating Torque

0.3 Ncm (solid shaft) @ 20 °C
0.6 Ncm (blind hollow shaft) @ 20 °C

Starting Torque

0.5 Ncm (solid shaft) at 20°C
0.8 Ncm (blind hollow shaft) at 20°C

Environmental

Housing Material

Aluminum

Shaft Material

Stainless steel

Operating Temperature [C (F)]

-30… +85° (-22… +185°)

Storage Temperature [C (F)] 

-40… +100° (-40… +212°)

Relative Humidity 

90%

Shock 

100 g/6 ms

Vibration 

20 g/10…2000 Hz

Enclosure Rating Shaft

IP65

Enclosure Rating Housing

IP67

Weight

0.2 kg (0.44 lb)

Standards

EN 61000-6-2 and EN 61000-6-3 EMC

Without packaging.

To condensation not permitted.

To DIN EN 60068-2-27.

To DIN EN 60068-2-6.

With mating connector inserted.