UNIOP EKDC-16 6ZA933-7

Description

Product Brief Introduction

UNIOP EKDC-16 (6ZA933-7) is a DIN rail mounted digital input expansion module exclusively matched to UNIOP series touchscreen HMI integrated controllers. It provides 16 channels of galvanically isolated 24 V DC digital input interfaces for collecting field limit switches, proximity sensors, pushbuttons, safety door interlock signals and relay auxiliary contact feedback signals. The module connects to UNIOP HMI via dedicated internal expansion bus, extending native HMI digital input channel capacity without separate external PLC hardware, supporting industrial automation packaging, textile, material handling and small machinery control applications.

Core Technical Specifications

1. Digital Input Channel Hardware
   • Total Isolated Input Channels: 16 Independent DC Digital Inputs
   • Input Signal Voltage Standard: 24 V DC nominal, operating range 18 V DC – 30 V DC
   • Input Signal Type: Universal NPN / PNP sink/source compatible sensor signals
   • Per-Channel Input Current Draw: 6 mA nominal at 24 V DC input voltage
   • Galvanic Isolation Voltage Rating: 2500 V AC between field side and expansion bus side
2. Expansion Bus Interface
   • Bus Standard: UNIOP proprietary high-speed HMI expansion bus
   • Maximum Cascading Quantity: Up to 8 EKDC series modules connected to single UNIOP HMI unit
   • Bus Signal Refresh Cycle: 0.5 ms full-channel input data update
3. Power Supply Parameters
   • Module Operating Power Input: 24 V DC (20 V DC – 30 V DC tolerance band)
   • Static Power Consumption Max: 4.8 W
4. Mechanical & Environmental
   • Mounting Standard: IEC 60715 35 mm DIN top hat rail
   • Overall Dimension (W × H × D): 115 mm × 90 mm × 75 mm
   • Operating Ambient Temperature: 0 °C ~ +55 °C
   • Storage Temperature Range: -20 °C ~ +70 °C
   • Humidity Tolerance: 10% – 85% RH non-condensing
   • Compliance Certifications: CE, UL61010 industrial control equipment safety standard
   • Module Housing Protection Grade: IP20 (cabinet internal installation only)

Function Characteristics

1. 2500 V AC reinforced galvanic isolation for each input channel eliminates ground loop interference between field sensor circuits and HMI internal control logic
2. Universal NPN/PNP signal compatibility supports all mainstream industrial proximity switches, mechanical limit switches and operator pushbuttons without wiring modification
3. High-speed 0.5 ms full-channel data refresh ensures real-time capture of fast pulse and short-duration machine trigger signals
4. Cascadable expansion bus architecture allows multi-module stacking to expand digital input count flexibly according to machine I/O demand
5. Per-channel front panel LED status indicator for direct visual judgment of input signal on/off state during on-site commissioning and troubleshooting
6. Built-in input reverse polarity protection circuit; miswiring positive/negative field sensor terminals does not generate permanent hardware damage
7. Input signal hardware filtering (4 ms fixed de-bounce filter) suppresses contact bounce noise from mechanical switches to avoid false trigger signal recognition

Performance Advantages Highlights

1. Dedicated matching design for UNIOP HMI controllers; seamless bus communication without third-party communication adapters or protocol conversion modules
2. High-density 16-channel single-module design minimizes DIN rail cabinet occupation space for multi-sensor machinery equipment
3. Reinforced isolation circuit protects HMI main unit from field circuit surge voltage and electrostatic discharge damage
4. Fixed hardware de-bounce filter eliminates software anti-jitter programming workload for mechanical switch input signals
5. Wide 24 V DC power supply tolerance maintains stable channel sampling performance under industrial cabinet power grid voltage fluctuation

Material Composition & Structural Features

1. Outer Enclosure: Black flame-retardant self-extinguishing PA66 industrial plastic housing with anti-static surface treatment
2. Internal Circuit Board: Double-layer FR4 flame-retardant PCB, independent isolated power zones for field input circuits and expansion bus logic circuits
3. Isolation Components: High-voltage optocoupler chips deployed on every individual digital input channel
4. Wiring Terminals: Spring push-in tin-plated copper terminals for vibration-resistant field sensor cable connection
5. DIN Rail Locking: Dual plastic spring latches to fix module securely under continuous machine vibration operating environments

Working Principle

Field 24 V DC digital sensor signals are transmitted to EKDC-16 channel input terminals; each signal passes through reverse polarity protection circuits and 4 ms hardware de-bounce filters before entering isolated optocoupler units. Optocouplers convert field-side voltage signals into isolated digital logic levels for internal module logic circuits. All 16-channel input status data is scanned synchronously at 0.5 ms intervals and transmitted via UNIOP dedicated expansion bus to the connected host HMI controller. The HMI stores all digital input states in internal register memory for control logic execution, real-time screen status display and fault alarm trigger judgment. Front panel channel LED indicators directly reflect the on/off logic state of each corresponding field input signal for on-site maintenance visualization.

Applicable Industries

Packaging automated machinery, textile production line equipment, food processing conveying systems, plastic injection molding machines, woodworking CNC equipment, automated warehouse conveying robots, small-scale water treatment skid control panels, building HVAC auxiliary equipment monitoring

Installation Mandatory Requirements

1. Mounting Method: Secure to standard 35 mm DIN rail inside IP30+ rated industrial control cabinet; reserve minimum 10 mm vertical clearance between adjacent modules for heat dissipation
2. Expansion Bus Wiring: Use factory-supplied dedicated flat ribbon expansion bus cable only; non-OEM cables cause communication packet loss and input signal lag
3. Field Sensor Wiring: Deploy shielded twisted-pair cables for long-distance sensor wiring; separate signal cables from high-current power cables with minimum 20 mm clearance inside wiring trays
4. Power Supply Specification: Connect module power terminals to regulated 24 V DC SELV industrial power supply fitted with 3 A slow-blow protective fuse
5. Grounding Rule: Connect module chassis PE terminal to cabinet main protective earth bar with 0.75 mm² minimum copper conductor
6. Cabinet Environment Restriction: Prohibit installation in environments with continuous oil mist, corrosive chemical vapor or conductive carbon dust accumulation

Operation & Maintenance Precautions

1. Do not plug/unplug expansion bus ribbon cable while HMI or EKDC-16 module is energized to prevent bus interface chip burnout
2. Continuous short-circuit of field input terminals over 3 seconds activates channel lockout protection; power cycle module to reset fault protection state
3. Ambient operating temperature exceeding +55 °C increases input signal sampling error and triggers LED indicator brightness degradation
4. Inspect spring push-in terminals every 6 months to eliminate loose wiring contact resistance leading to unstable input signal reading
5. Maximum cascading limit of 8 modules per HMI unit must not be exceeded; excess modules cause bus communication overload and data refresh delay
6. Clean front panel LED indicator surface only with dry microfiber cloth; chemical cleaning solvents damage plastic housing surface and printed labeling