Addi-Data APCI-1710 Handmatig - Pagina 6
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Function description
1 Function description
The "Pulse counter" function is an interface for the acquisition of external digital pulses.
Up to 16 pulse encoders can be connected to the board, i.e. up to four pulse encoders per function
module.
The pulse counter is a downward counter. It starts when the programmed counter value has been
loaded and the gate bit has been set. After that, the counter decrements with every valid edge (rising
or falling) at the counter input. When the counter has run down, an interrupt can be released. With
counter 0, it is also possible at this point to set or reset the digital output.
In Continuous Mode, the counter will be restarted afterwards.
Features:
•
4 function modules, each with 4 pulse counters (32-bit)
•
Processing of up to 5 MHz signals
•
Optical isolation of the inputs and outputs through opto-couplers to prevent ground loops
•
Function and control logic
•
2 counter modes:
Single Mode: When the counter value is "0", the counter is stopped.
Continuous Mode: When the counter value is "0", the reload value will be reloaded with the
next valid edge.
•
4 separate 32-bit registers, which can be read out via the PCI bus
1.1 Board versions with "Pulse counter" function
The I/O specifications of the different board versions are available in the Technical Description of the
APCI-/CPCI-1710 (see PDF link).
www.addi-data.com
NOTICE!
The "Pulse counter" function can be used with every version of the
APCI-1710 or CPCI-1710.
6
PCI-1710: Pulse counter