Description
Honeywell SDI-1624CCV1.2
Technical Specifications
- Channel Quantity: 16 independent digital input channels
- Input Signal Type: 24VDC sinking / sourcing discrete input, dry contact
- Rated Input Voltage: 18VDC to 30VDC
- Communication Interface: RS485 Modbus RTU
- Working Ambient Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Relative Humidity: 5% to 90% RH non-condensing
- Isolation Rating: 1500VAC field to logic isolation
- Mounting Method: TS35 standard DIN rail mounting
- Certification: CE, RoHS
Functional Features Each channel supports configurable sinking and sourcing input mode. It provides adjustable signal debounce time to eliminate mechanical contact bounce interference. It sends real-time channel on-off status and diagnostic information to host controller via Modbus RTU. It has independent LED status indicator for each channel and module power fault indicator. It supports cascading connection with other Modbus I/O modules on the same RS485 bus. It detects open circuit fault for wired input loops. It supports Modbus address setting via DIP switch. It supports firmware upgrade through RS485 bus port.
Application Scenarios Valve limit switch feedback signal collection Pump and fan running status feedback acquisition Chemical plant interlock contact signal monitoring Conveyor equipment safety switch signal collection HVAC fire damper limit switch status monitoring Industrial PLC remote discrete I/O expansion spare replacement
Performance Parameters
- Input Response Delay: Less than 0.3ms after debounce expiration
- Insulation Resistance: Greater than 1000 MΩ
- Mean Time Between Failures: 880000 hours
- ESD Immunity: 8kV contact discharge
- Channel Leakage Current: Less than 10μA at off state
- Terminal Wiring Specification: 0.5mm² to 2.5mm² copper wire
- Modbus Communication Baud Rate: 2400, 4800, 9600, 19200 configurable
Material Composition FR4 flame retardant PCB substrate High speed optocoupler isolation array TVS transient voltage suppression diodes Metal film sampling resistors DIP switch for Modbus address setting Nylon UL94 V-0 terminal block ABS flame retardant plastic housing Green and red LED status indicators Steel DIN rail spring clip
Structural Features Compact rectangular housing optimized for DIN rail installation. Front panel integrates terminal block, channel LED indicators and DIP switch area. Rear side RS485 bus terminal for inter-module connection. Internal circuit layout separates field signal zone and bus communication logic zone. Quick-release locking clip secures the module firmly on DIN rail. Removable terminal plug supports pre-wiring before module installation. Bus terminal supports daisy chain wiring.
Working Principle Field discrete signal or dry contact closes the input loop. The optocoupler converts the field signal into isolated logic level signal. The on-board logic chip reads each channel status and filters bounce signal according to configured debounce parameter. Valid status data is packaged into Modbus register and transmitted to host controller through RS485 bus. If the wiring circuit is open, the module triggers fault flag and uploads fault code to host.
Installation Requirements Mount SDI-1624CCV1.2 on TS35 DIN rail inside dry control cabinet. Wire field switch cable to the corresponding channel terminal. Connect RS485 bus cable between module and host controller or adjacent Modbus I/O module. Set Modbus address and baud rate by DIP switch. Configure channel input mode and debounce time in host PLC software. Power on the module and verify LED status matches field switch action. Separate signal wiring from high voltage power cable in wiring duct.
Usage Notes Do not apply AC voltage to any input terminal. Terminate the two ends of bus with 120Ω terminal resistor for long distance wiring. Shielded twisted pair cable is mandatory for communication bus. Tighten terminal screws to specified torque to avoid poor contact under cabinet vibration. Do not install this module in outdoor exposed environment without protection enclosure.
