Allen-Bradley 1791ES-IB16 EtherNet/IP 16-Input Safety Block

1791ES-IB16 Allen-Bradley CompactBlock Guard I/O Safety Module

The 1791ES-IB16 is a high-performance EtherNet/IP safety module designed to implement the Common Industrial Protocol (CIP) Safety standard. It provides 16 current-sinking safety inputs and 16 pulse test outputs, enabling high-level protection for complex industrial machinery. This module supports Safety Integrity Level (SIL) 3 and Performance Level e (PLe) ratings, making the 1791ES-IB16 an essential component for safety-critical control networks that require distributed I/O in harsh environments.

Oiltech Controls’ Insight

• Engineering teams utilize the 1791ES-IB16 to monitor safety devices such as light curtains, emergency stop buttons, and gate switches.
• The module features a robust dual-channel mode that evaluates consistency between two signals to meet Category 3 and 4 safety requirements.
• We recommend this unit for high-speed safety loops due to its integrated EtherNet/IP communication and rapid short-circuit detection capabilities.
• The 16 pulse test outputs significantly enhance fault detection by identifying cross-loop wiring shorts before they compromise the safety system.
• For optimal durability, ensure the module resides in an IP54-rated enclosure or higher to protect its 50V DC isolation circuits.

Detailed Technical Specifications

• Manufacturer: Allen-Bradley / Rockwell Automation
• Model Number: 1791ES-IB16
• Safety Rating: SIL CL 3, PLe, Category 4
• Input Configuration: 16 Current Sinking (IEC 61131-2 Type 3)
• Test Outputs: 16 Current Sourcing (Pulse Test)
• On-State Voltage: 11V DC Minimum
• Off-State Voltage: 5V DC Maximum
• Output Current: 0.7A per pulse output (8A aggregate at 60 °C)
• Communication: Single RJ45 EtherNet/IP Port
• Operating Voltage Range: 19.2-28.8V DC
• Isolation Voltage: 50V Continuous (Tested at 800V DC for 60s)
• Dimensions: 80mm x 196mm x 77mm (3.2in x 7.7in x 3in)

Industrial Application Compatibility

• Integrated safety control systems using GuardLogix or SmartGuard safety controllers.
• Heavy-duty packaging machinery requiring high-density safety input monitoring.
• Robotic assembly cells utilizing dual-channel light curtains and interlocking gate switches.
• Material handling systems that must comply with ISO-13849-1 and IEC 61508 safety standards.
• Remote I/O configurations where long-distance safety data transmission over standard Ethernet is required.

Order Logistics & Service

• Warranty: We provide a comprehensive 12-month warranty on every 1791ES-IB16 unit sold.
• Shipping Lead Time: Standard dispatch occurs within 24-28 hours of order confirmation.
• Express Delivery: Global shipping is available through FedEx, UPS, and DHL.
• Technical Inquiries: Send your requirements to info@oiltechcontrols.com for a formal quote.
• Instant Support: Contact our specialists via WhatsApp: +86 158 8020 0923 for availability updates.
• Author: Technical review provided by Oiltech Controls engineering department.

Professional FAQ & Selection Guide

• Question: Can I use the 1791ES-IB16 for single-channel safety applications?Answer: Yes, the module supports single-channel mode to meet Safety Category 2, SIL CL 2, and Performance Level d requirements.
• Question: What wire specifications are required for the I/O terminals?Answer: Use 22–16 AWG (0.34…1.5 mm²) copper wire rated for 75 °C with a maximum insulation thickness of 1.2 mm.
• Question: How does the pulse test output prevent nuisance tripping?Answer: The pulse outputs check for field wiring shorts without turning off the safety device, ensuring continuous monitoring and high uptime.
• Question: Is there a specific orientation required for mounting this block?Answer: While versatile, ensure adequate airflow to maintain the 8A aggregate current rating when operating at 60 °C.
• Question: What is the significance of the 50V isolation testing?Answer: The 800V DC 60s test ensures the network communication remains protected from voltage spikes occurring on the I/O field side.

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