842-SIP4BA Allen-Bradley

842-SIP4BA Allen-Bradley Power Board

Brand：Allen-Bradley Model number：842-SIP4BA

Country of origin: United States Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The 842E-SIP4BA is designed to serve as an auxiliary position feedback device that seamlessly interfaces with Rockwell Automation architectures, particularly complementing Kinetix motion drives and Logix-based controllers. It utilizes advanced optical or magnetic sensing technology to deliver absolute position data, meaning the encoder retains its exact position tracking even if power is completely lost to the system. Equipped with a dual-port embedded switch, this encoder supports advanced Ethernet network designs right out of the box, allowing devices to be linked together directly on the plant floor.

Product Parameters

Encoder Type: Absolute Single-turn Rotary Encoder
Communication Output: EtherNet/IP compliant with IEEE 1588 (CIP Sync and CIP Motion protocols)
Resolution: 18-bit resolution, providing exceptionally fine measurement granularities per revolution
Operating Voltage Range: 10 to 30 Volts DC
Current Draw: 200 milliamps maximum at 24 Volts DC
Power Consumption: 3 Watts maximum
Mechanical Interface: Solid shaft measuring 10 millimeters in diameter, featuring a machined flat edge to prevent coupling slippage
Connection Type: Industry-standard M12 micro-connectors for power and network ports
Transmission Rate: 10/100 Megabits per second adaptive speed via Category 5e industrial cabling
Repeatability: High precision accuracy verified to within +/-0.002 degrees
Enclosure Rating: IP65 or IP67 depending on installation seals, shielding internal components from dust and high-pressure water jets
IP Addressing Options: Software configuration, Dynamic Host Configuration Protocol (DHCP), or integrated hardware switches

Product Advantages

A critical advantage of the 842E-SIP4BA is its Network Topology Flexibility. Thanks to its embedded dual-port Ethernet switch, it fully supports Linear, Star, and Device Level Ring (DLR) network structures, with DLR providing automatic fault tolerance if an Ethernet cable is severed.

Another massive benefit is Cost and Cabling Reduction; because position data transfers over standard industrial Ethernet, there is no need for dedicated, expensive encoder feedback modules or specialized, multi-conductor point-to-point homing cables.

The CIP Motion and CIP Sync Integration ensures that the encoder's position updates are perfectly synchronized with other servo drives on the network down to the microsecond level, which is ideal for complex, multi-axis machines. Additionally, its High 18-bit Resolution provides incredible precision, allowing the master controller to implement very tight velocity and position loops.

Important Considerations and Precautions

When handling and installing the 842E-SIP4BA, technicians must respect Mechanical Alignment Limits. Misalignment between the encoder shaft and the driving motor or machine shaft can exert excessive radial or axial force on the internal bearings, causing premature mechanical failure; always use high-quality flexible couplings.

Because it operates as an active network node, proper IP Address Management must be executed during commissioning; assigning a duplicate IP on the local subnet will cause immediate network communication drops.

It is also vital to note that this series has reached Discontinued Status by Rockwell Automation, making stock planning and migration strategies toward the newer 843ES series highly recommended for new machine designs.

Lastly, despite its robust IP67 aluminum housing protection, the M12 Connectors Must Be Torqued Properly and unused ports must be capped with sealing plugs, as moisture ingress through loose Ethernet connections can short out the internal transceiver boards.

Product Applications

The 842E-SIP4BA is widely implemented in high-speed, automated environments where precise velocity or position reporting over a network is required.

Material Handling and Conveyors: Tracking the exact position of products on high-speed sorting systems or controlling automated storage and retrieval system (ASRS) shuttles.
Packaging and Labeling Machinery: Providing master-axis synchronization for rotary cutters, capping machines, and labeling heads that rely on CIP Motion.
Automotive Assembly Lines: Monitoring the position of indexing tables, transfer shuttles, and overhead crane lifters.
Printing and Converting Presses: Ensuring exact web tension and registration control across long printing or paper-slitting lines.
Food and Beverage Processing: Tracking automated filling valves and multi-tier pick-and-place packaging systems.

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