Honeywell 621-1160 (6211160) Product Description

621-1160 is a 16-channel, 115V AC digital input module within the Honeywell 621 series I/O system. It is used for industrial PLC/DCS systems to collect AC analog signals (such as valve feedback, relay status, buttons, limit switches), and it is a classic universal DI module, compatible with the 621 series I/O rack. 

I. Basic Information

Brand: Honeywell (Honeywell)

Full Model: 621-1160 (Abbreviation: 6211160)

Series: 621 Series I/O Module (IPC 621 Rack)

Type: 16-channel AC Digital Input Module (DI)

Production Status: Out of Production (Second-hand / Repaired / Maintenance Channel)

Weight: Approximately 0.36 kg

Size: Approximately 145 × 100 × 40 mm

Installation: Inserted into the 621 Series I/O Rack

Suffix R: 621-1160R indicates Hot Swap (powered insertion)

II. Core Functions

16 Independent AC Inputs: Collect 115V AC dry contacts / active signals

Optical Isolation: Channel - System-side high isolation, anti-interference, anti-ground loop current

Status Indication: Each channel LED on / off indicates on / off

Hardware Filtering: Suppress contact jitter, electromagnetic interference

Compatibility: 621 Series PLC, IPC Control System

621-1160R: Supports Hot Swap (powered replacement, does not affect rack)

III. Electrical Specifications

Input Signal: 115V AC (80–140V AC Effective)

Number of Channels: 16 Channels (Independent)

Input Current: 4–15 mA @ 115V AC

Input Type: Dry Contact / Active AC Voltage Input

Isolation Voltage: 1500V AC / DC (Channel - System-side)

Power Supply: 5V DC (Backplane Power Supply, approximately 250 mA)

Response Time: ≤ 10 ms

Filtering: Hardware Anti-Jitter (Configurable)

IV. Environmental Parameters

Operating Temperature: -20°C ~ +60°C

Storage Temperature: -40°C ~ +85°C

Humidity: 5–95% RH (No Condensation)

Anti-Vibration: 10–55 Hz, 0.7 mm Double Amplitude

Protection: IP20 (Installed in Cabinet)

Certifications: CE, UL, CSA

V. Interfaces and Status

Field Interface: 50-pin D-Sub / European Terminal

Status LED:

PWR: Green (Power Supply Normal)

Each Channel 1 LED: On = ON, Off = OFF

Bus Interface: 621 Rack-specific Parallel Bus

VI. Typical Applications

Industrial Automation: Valve Position, Relay Status, Pump / Motor Operation Feedback

Power / Metallurgy: Switch Cabinet Status, Limit Switch, Alarm Input

Chemical / Paper Industry: 115V AC Instrument, Button, Indicator Light Status Collection

Equipment Renovation: Old System 621 I/O Maintenance, Replacement

VII. Model Distinction (Confusing)

621-1160: 16-channel 115V AC Input (No Hot Swap)

621-1160R: 16-channel 115V AC Input + Hot Swap

621-1100: 16-channel 24V DC Input (DC Type)

VIII. Common Faults and Troubleshooting

No Input on Channel (LED Does Not Light Up)

Reason: Loose Wiring, Fuse Blown, 115V AC Missing, Module Fault

Troubleshooting: Measure Terminal Voltage, Check Fuse, Reinsert Cable, Replace Module

Status Flashes / Unstable

Reason: Interference, Poor Contact, Low Voltage (<80V AC)

Troubleshooting: Shielding Wire, Single Point Grounding, Confirm Input Voltage

PWR Light Does Not Light Up

Reason: Rack No 5V, Module Not Tightly Inserted, Bus Fault

Troubleshooting: Reinsert, Check Rack Power Supply, Test in Slot Position

IX. Related Models

Digital Output: 621-1200 (16 Points 115V AC DO) DC Input: 621-1100 (16 points 24V DC DI)

Analog Input: 621-0022 (8 points 4–20mA AI)

Hot-swappable Series: 621-xxxxR (R = Hot-swappable)