Loop checking is a vital pre-commissioning process in industrial automation that verifies signal integrity between field instruments and control systems like PLCs or DCS. It ensures accurate wiring, calibration, and control logic before startup, reducing downtime and improving plant reliability and safety.
Product Details
Product Overview
The 1770-KF2 (Part Number 1770-KF2) is a versatile asynchronous communication interface designed to bridge the gap between intelligent RS-232-C or RS-422-A devices and the Allen-Bradley Data Highway (DH) or Data Highway Plus (DH+) networks. This module acts as a protocol converter, allowing minicomputers, industrial terminals, and third-party systems to exchange data with PLC-2, PLC-3, and PLC-5 controllers. It is a standalone unit typically utilized in control room environments for system monitoring and peer-to-peer data synchronization.
Core Technical Specifications
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Network Compatibility: Supports both Data Highway and Data Highway Plus (DH+) protocols
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Asynchronous Interface: Selectable RS-232-C or RS-422-A communication
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Data Rates: 57.6 kbps for DH/DH+ peer links; 110 to 9600 bps for asynchronous serial connections
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Input Power: Dual-voltage support at 115 VAC or 230 VAC, drawing approximately 0.3 A
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Frequency Range: 50/60 Hz single-phase AC
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Physical Construction: Tabletop or shelf-mount enclosure for controlled environments
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Unit Weight: 6.00 lbs (2.72 kg)
Detailed Port Configuration
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Peer Communication Link: 15-pin male EIA D-shell connector for primary network integration
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Network Monitor Port: 9-pin female EIA D-shell connector for diagnostic monitoring
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Asynchronous Link: 25-pin male EIA D-shell connector for RS-232-C or RS-422-A hardware interfacing
Environmental and Operating Parameters
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Operating Temperature: 32°F to 113°F (0°C to 45°C)
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Storage Temperature: -40°F to 185°F (-40°C to 85°C)
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Relative Humidity: 10% to 80% non-condensing atmosphere
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Mounting Requirements: Horizontal placement in a clean, dust-free enclosure or office setting
Application Scenarios
The 1770-KF2 is frequently deployed in legacy industrial systems where a PC-based HMI or a Unix-based minicomputer requires access to the PLC memory map. It is particularly effective for bridging newer supervisory systems with older 1771-KG or 1775-KA based networks, facilitating phased system upgrades without replacing existing cabling.
Frequently Asked Questions
Q: Can the 1770-KF2 be used as a direct replacement for a 1770-KF3?A: No. While similar, the 1770-KF3 is specifically designed for DH-485 networks, whereas the 1770-KF2 is exclusively for Data Highway and Data Highway Plus networks.
Q: Does this module require internal configuration via jumpers?A: Yes, users must set internal DIP switches and jumpers to define the protocol (DH or DH+), station address, and baud rate for the asynchronous serial link.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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