Description

The Reliance Electric 57552-4 is a high-performance digital I/O module designed for the AutoMate family of programmable logic controllers. As part of Reliance Electric’s comprehensive industrial automation ecosystem, which later became integrated into Rockwell Automation’s product portfolio, this module provides critical interface capabilities between the PLC processor and field devices. The Reliance Electric 57552-4 specifically serves as a 16-point DC input module, enabling the system to monitor discrete signals from sensors, switches, and other digital devices in industrial environments. Built to withstand harsh manufacturing conditions, this module offers reliable signal acquisition and electrical isolation, ensuring accurate data processing for control applications. The Reliance Electric 57552-4 represents the robust design philosophy that characterized Reliance’s automation components, emphasizing durability, maintenance-friendly features, and seamless integration within the AutoMate platform. This module plays an essential role in expanding the I/O capacity of control systems, allowing for scalable automation solutions across various industrial applications.

57552-4 RELIANCE

Technical Specifications

Parameter Name	Parameter Value
Product Model	57552-4
Manufacturer	Reliance Electric (Rockwell Automation)
Product Type	Digital Input Module
I/O Points	16-point DC input
Input Voltage	24 VDC nominal
Voltage Range	10-30 VDC
Input Current	8 mA per point typical
Response Time	≤ 10 ms
Isolation	1500 VAC channel-to-channel and channel-to-backplane
Backplane Current	85 mA at 5VDC
Operating Temperature	0 to 60°C (32 to 140°F)
Storage Temperature	-40 to 85°C (-40 to 185°F)
Relative Humidity	5 to 95% (non-condensing)

Main Features and Advantages

The Reliance Electric 57552-4 digital input module offers several distinct advantages for industrial control applications. Its high-density 16-point configuration provides space-efficient I/O expansion, allowing users to maximize control capability within limited rack space. The module features advanced electrical isolation (1500 VAC) between channels and from the backplane, which protects the controller from electrical noise, voltage transients, and ground loops commonly found in industrial environments. This robust isolation ensures signal integrity and system reliability, critical factors in maintaining continuous operation in manufacturing settings. The Reliance Electric 57552-4 incorporates diagnostic LEDs for each channel, enabling quick visual status monitoring and simplified troubleshooting. With a wide operating voltage range of 10-30 VDC, the module accommodates typical industrial control voltages while providing tolerance for voltage fluctuations. The design emphasizes easy installation and maintenance, featuring removable terminal blocks that simplify wiring and module replacement without disturbing field wiring.

Application Field

The Reliance Electric 57552-4 finds extensive application across various industrial sectors where reliable digital signal acquisition is required. In manufacturing automation, this module is deployed to monitor limit switches, proximity sensors, and push buttons on assembly lines, robotic work cells, and material handling systems. The packaging industry utilizes the Reliance Electric 57552-4 to track machine status, safety interlock conditions, and product presence sensors on filling, capping, and labeling equipment. In automotive production facilities, the module interfaces with sensors that detect part positioning, clamp status, and machine readiness signals. The Reliance Electric 57552-4 also serves critical functions in conveyor control systems, monitoring photoeyes, zero-speed switches, and emergency stop circuits in distribution and warehouse automation. Water treatment plants employ these modules to monitor pump status, valve position feedback, and level switch inputs throughout treatment processes. The robust design of the Reliance Electric 57552-4 makes it suitable for these demanding environments where electrical noise immunity and reliable operation are paramount.

57552-4 RELIANCE

Related Products

57552-1: 8-point DC input module with similar characteristics but lower point density

57552-2: 16-point DC output module complementing the input capabilities

57552-3: 32-point DC input module for higher density applications

57412: AutoMate processor module that coordinates with I/O modules

57553 series: Analog I/O modules for process variable monitoring and control

57560 series: Specialty modules including communication and positioning modules

57570: Power supply modules for the AutoMate platform

AutoMate 30/40: Advanced processor systems compatible with 57552 series I/O

Installation and Maintenance

Pre-installation preparation: Before installing the Reliance Electric 57552-4 module, ensure complete power disconnection from the AutoMate rack and verify compatibility with the existing system configuration. Check that the rack slot address matches the system programming and that the module’s firmware revision is compatible with the processor. Have all necessary documentation, including wiring diagrams and address assignment records, readily available. Verify that the field devices to be connected operate within the module’s electrical specifications, particularly the 24VDC input range.

Maintenance recommendations: For optimal performance of the Reliance Electric 57552-4, regularly inspect terminal connections for tightness and corrosion, particularly in environments with vibration or moisture. Periodically check the status LEDs during operation to verify proper signal acquisition from field devices. Maintain clean operating conditions to prevent dust accumulation that could affect heat dissipation. Keep spare modules available for critical applications to minimize downtime in case of failure. Document all maintenance activities and module replacements for future reference and troubleshooting.