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SNAP+
Backplane Controller for High-Speed Remote I/O
Overview
Basic SliceBus backplane information:
- Single master system
- Up to 64 slave (Node) stations
- Asynchronous, serial data transmission with 48 MBit/s over Point to Point LVDS physic
- Additional alarm line for initialization and asynchronous event communications from node to master
- Full system detection from SliceBus master without external information on module configuration
Error detection mechanism:
- CRC code with Hamming distance 4 for every telegram (all 3 bit errors will be detected)
- Watchdog function inside every node for SliceBus master observation
- "Auto shut down" in case of SliceBus master malfunction
- Retry statistic for early detection of possible transmission issues
Time-synchronisation:
- Every node has its own clock with 1 µs resolution
- All node clocks are synchronized with the SliceBus master (accuracy <100ns)
- Option for clock synchronization from SliceBus master to SliceBus master via different protocols
(Profibus DP V2, Profinet, Ethercat,...)
SNAP+ Technological functions:
- Standard I/O function: 8 digital I/O or up to 32 I/O with shift register
- Integrated digital input filter function
- Asynchronous event signaling with µs time stamping for advanced nodes
- Two advanced counters with AB oversampling, latch, reset, output, hysteresis, comparevalue, repetitive/endless counting and additional time stamp information
- SSI function with time stamp information (speed calculations: counter difference/time)
- Pulse Width Modulation with 20 ns resolution
- Frequency measurement mode
- Special digital I/O time stamp nodes (ETS: Edge Time Stamp System) for input edge and output control with 1 µs resolution (independent from fieldbus cycle!)
SPI interface in SNAP+ for analog I/O / safety / serial CP with external MCU:
- 2.6 Mbit/s SPI interface for external microcontroller
- Up to 192 Byte for parameters, up to 16 Byte In / 16 Byte Out data for external microcontroller
- Alarm function and watchdog function
Performance:
- Different speed grades for data transmission
- Multinode telegrams for maximum efficiency:
- Write 64 nodes (8 outputs/node): 17 µs
- Read 64 nodes (8 inputs/node): 32 µs (with node presence check), Asynchronous event reaction time: 9 µs
Mechanical and electrical specification SNAP+ (preliminary):
- I/O voltage: 3.3 V, typ. 16 mA, core voltage: 1.8 V, typ. 16 mA
- DI8 or DO8 modul without I/O load: typical: 5 V, 32 mA
- LQFP 48 package, 9.0 mm², pitch 0.5 mm
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