Description
WOODHEAD DRL-DPM-BKF
Technical Specifications:
- Form Factor: PC/104 standard stackable card
- Communication Protocol: PROFIBUS DP, master scanner mode
- Maximum Baud Rate: 12 Mbps
- Power Supply: +5 VDC from PC/104 bus
- Isolation: Opto-isolation for PROFIBUS bus signals
- Operating Temperature: -40°C to +85°C
- Storage Temperature: -40°C to +85°C
- Humidity: 5% to 95% non-condensing
- Bus Interface: PC/104 ISA bus
- Connector: 9-pin D-Sub PROFIBUS DP port
- Firmware: Onboard flash memory for communication firmware
Function Features:
- PROFIBUS DP master scanner function to poll multiple slave devices on the bus
- Cyclic real-time input/output data exchange for control signals
- Acyclic parameter read/write for slave device configuration and diagnosis
- Onboard hardware bus management to reduce host CPU communication load
- Built-in bus fault detection, short circuit and line break diagnosis
- LED indicators for power, bus activity and communication fault status
- Support standard PROFIBUS GSD file configuration for slave devices
- Stackable PC/104 design for multi-module embedded stacking
Application Scenarios:
- Embedded PC/104 based industrial control systems
- Legacy power plant turbine auxiliary control cabinets
- Factory automation machine control with PROFIBUS DP fieldbus
- Process control monitoring and data acquisition systems
- Retrofit and spare part replacement for old embedded automation controllers
Material Composition:
- Substrate: Multilayer FR4 fiberglass printed circuit board
- Core Chips: PROFIBUS ASIC controller, optocoupler isolation chips, bus transceiver
- Connectors: 9-pin D-Sub metal shielded connector, PC/104 stack through-hole connectors
- Passive Components: Industrial grade resistors, capacitors and surge suppression diodes
- Solder: Lead-free industrial solder
Structural Features:
- Compact PC/104 stackable rectangular PCB design
- Metal shielded D-Sub connector mounted on board edge
- Stack-through pin headers to allow stacking of additional PC/104 modules
- Onboard status LEDs visible on board edge
- No external heat sink required, low power consumption
Working Principle: The card draws power and host communication from PC/104 ISA bus. The onboard PROFIBUS ASIC handles the physical layer and data link layer of PROFIBUS DP. It executes cyclic polling of all configured DP slaves, reads input data from field slaves and writes output commands from host controller. Isolation circuits separate the embedded PC side from field bus to block ground loop interference. Fault detection circuits monitor bus signal quality and report communication errors back to host software.
Installation Requirements:
- Stack the card onto PC/104 CPU board via stack-through connectors inside sealed industrial cabinet
- Maintain proper stacking alignment to avoid pin bending or short circuit
- Use shielded PROFIBUS cable with proper bus termination resistor at bus endpoints
- Separate PROFIBUS field wiring from high voltage power cables
- Ensure reliable cabinet protective grounding for bus shielding
- Keep cabinet ventilation to maintain operating temperature range
Usage Notes:
- Load matching GSD files for all PROFIBUS DP slaves during software configuration
- Verify bus termination resistor setting on PROFIBUS network
- Avoid hot swapping the PC/104 stack while powered on
- Prevent conductive dust and metal debris on PCB surface
- Disconnect all power before adding or removing PC/104 modules
- Backup communication configuration before firmware update
